AMERICAN RADIO SYSTEMS CORP /MA/
8-K, 1998-01-23
RADIO BROADCASTING STATIONS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-K


                                 CURRENT REPORT

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

                Date of Report (Date of earliest event reported):
                       January 22, 1998 (January 8, 1998)

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

    Delaware                             0-26102              04-3196245
(State or Other Jurisdiction           (Commission           (IRS Employer
 of Incorporation                      File Number)          Identification No.)





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




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





<PAGE>



Item 5.  Other Events

         1.  On  January  8,  1998,  American  Tower  Systems  (Delaware),  Inc.
(formerly  known  as  American  Tower  Systems,  Inc.  ("ATSI")),   an  indirect
wholly-owned   subsidiary  of  American  Radio  Systems   Corporation   ("ARS"),
consummated the transactions contemplated by the Stock Purchase Agreement by and
among ATSI, OPM-USA,  Inc. ("OPM"), a Florida corporation,  and the Stockholders
of OPM,  dated as of  September  30,  1997  (the  "Stock  Purchase  Agreement"),
pursuant to which ATSI acquired all of the outstanding stock of OPM. Pursuant to
the terms of the Stock Purchase  Agreement,  ATSI paid OPM  approximately  $21.3
million  at  closing  representing  the  initial  installment  in the  aggregate
purchase price, which could approximate $105.0 million.  This initial advance of
the purchase price was financed with borrowings under the ATSI credit facility.

         As of December 31, 1997, OPM owned,  leased and operated  approximately
90  communications  tower sites in the  southeastern  United  States  (primarily
Florida) and was also engaged in the  business of managing  communication  sites
for third parties.  OPM is in the process of developing an additional 160 towers
which are expected to be constructed  during the next 12 to 18 months.  Pursuant
to the terms of the  agreement,  ATS will  finance  up to $37.0  million of such
construction  financing,  of which approximately $5.7 million was advanced as of
December 31, 1997. Additional  installments of the purchase price are contingent
upon the number of  constructed  towers and projected cash flow for these towers
and will be made quarterly through August 31, 1999.

         For  more  information,  see the  Stock  Purchase  Agreement,  which is
incorporated  by  reference  to the ARS  Quarterly  Report  on Form 10-Q for the
period ended September 30, 1997.


         2. On  January  22,  1998,  ATS and ATSI  consummated  the  transaction
contemplated by the Agreement and Plan of Merger,  dated as of November 21, 1997
(the "Gearon Merger Agreement"),  as amended by Amendment No. 1 to Agreement and
Plan of Merger,  dated as of January 22, 1998 ("Amendment  No.1"),  by and among
American Tower Systems Corporation  ("ATS"), a subsidiary of ARS, ATSI, Gearon &
Co., Inc.  ("Gearon"),  a Georgia  corporation,  and J. Michael Gearon, Jr., the
principal  stockholder of Gearon (the "Gearon  Stockholder"),  pursuant to which
Gearon merged with and into ATSI (the "Gearon  Merger").  Pursuant to the Gearon
Merger,  ATS issued an aggregate of 5,333,333 shares of ATS Class A Common Stock
and  paid  approximately  $24.6  million  in cash  and  assumed  liabilities  of
approximately  $7.4  million  for an  aggregate  agreed  upon  consideration  of
approximately $80.0 million.

         For  more  information,  see the  Gearon  Merger  Agreement,  which  is
incorporated  by reference as Exhibit 2.2 to the ARS Current Report on Form 8-K,
dated December 23, 1997,  Amendment No. 1, which is attached herewith as Exhibit
2.1, and the ARS press release, dated December 3, 1997, which is incorporated by
reference as Exhibit 99.2 to the ARS Current  Report on Form 8-K, dated December
23, 1997.


         3. On January 22, 1998, ATS consummated the  transactions  contemplated
by the American Tower Systems Corporation Stock Purchase Agreement,  dated as of
January  8, 1998  (the "ATS  Stock  Purchase  Agreement"),  by and among ATS and
certain  officers,  directors  and  other  affiliates  of  ARS  (individually  a
"Purchaser" and collectively, the "Purchasers"), pursuant to which ATS issued an
aggregate of 8,000,000  shares of ATS Class A Common  Stock,  ATS Class B Common
Stock  and ATS  Class C Common  Stock  at a price of  $10.00  per  share  for an
aggregate  agreed upon  consideration of $80.0 million,  of which  approximately
$31.0  was paid in the form of cash and the  balance  in the form of  promissory
notes due on the earlier of  consummation  of the merger of ARS and a subsidiary
of CBS Corporation and December 31, 2000, secured by ARS Common Stock.



<PAGE>



         For more information,  see the ATS Stock Purchase  Agreement,  which is
attached herewith as Exhibit 10.2, the ATS press release, dated January 8, 1998,
which is  incorporated by reference as Exhibit 99.1 to the ARS Current Report on
Form 8-K, dated January 9, 1998.


Item 7.  Financial Statements and Exhibits

         (c).  Exhibits


         Exhibit 2.1   -  Amendment No. 1, dated as of  January 22, 1998, among
                          ATS, ATSI, Gearon and the Gearon Stockholder.

         Exhibit 2.2   -  Agreement  and  Plan  of  Merger,  dated  as of
                          November 21, 1997, by and among ATS, ATSI,  Gearon and
                          the Gearon Stockholder.*

         Exhibit 10.1  -  Stock Purchase Agreement, dated as of September
                          30,  1997,  by and among ATSI,  OPM-USA,  Inc. and the
                          Stockholders of OPM - USA, Inc.**

         Exhibit 10.2  -  ATS  Stock  Purchase  Agreement,  dated  as of
                          January 8, 1998, by and among ATS and the Purchasers.

         Exhibit 99.1  -  ARS Press Release, dated December 3, 1997.***

         Exhibit 99.2  -  ATS Press Release, dated January 8, 1998.****


                  *        Filed as  Exhibit  2.2 to the ARS  Current  Report on
                           Form 8-K, dated December 23, 1997.

                  **       Filed as Exhibit 10.6 to the ARS Quarterly  Report on
                           Form 10-Q for the period ended September 30, 1997.

                  ***      Filed as Exhibit  99.2 to the ARS  Current  Report on
                           Form 8-K, dated December 23, 1997.

                  ****     Filed as Exhibit  99.1 to the ARS  Current  Report on
                           Form 8-K, dated January 9, 1998.





<PAGE>


                                   SIGNATURES


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


                                       AMERICAN RADIO SYSTEMS
                                       CORPORATION
                                       (Registrant)


Date: January 22, 1998                 By: /s/ Justin D. Benincasa
                                           Name: Justin D. Benincasa
                                           Title: Vice President and 
                                                  Corporate Controller






                                                                     EXHIBIT 2.1

                                 AMENDMENT NO. 1
                                       TO
                          AGREEMENT AND PLAN OF MERGER


         THIS  AMENDMENT  No. 1 TO  AGREEMENT  AND PLAN OF  MERGER is made as of
January  22,  1998,  among  American  Tower  Systems  Corporation,   a  Delaware
corporation  ("ATS"),  American  Tower  Systems  (Delaware),  Inc.,  a  Delaware
corporation  formerly known as American Tower Systems,  Inc. ("ATSI"),  Gearon &
Co., Inc., a Georgia  corporation  ("Gearon"),  and J. Michael Gearon,  Jr. (the
"Gearon Stockholder").

                              W I T N E S S E T H:

         WHEREAS, ATS, ATSI, Gearon and the Gearon Stockholder are parties to an
Agreement  and Plan of  Merger  dated  as of  November  21,  1997  (the  "Merger
Agreement"); and

         WHEREAS,ATS,  ATSI,  Gearon and the Gearon  Stockholder  have agreed to
amend the Merger  Agreement as set forth herein  pursuant to Section 11.1 of the
Merger Agreement;

         NOW, THEREFORE, in consideration of the foregoing,  the parties hereto,
intending to be legally bound, agree as follows:

         1. Section  3.1(b) of the Merger  Agreement  is hereby  deleted and the
following new Section 3.1(b) is inserted in its place:

                  "(b) Each share of Common Stock,  no par value, of Gearon (the
         "Gearon Common Stock") issued and outstanding  immediately prior to the
         Effective  Time  (other  than  shares  held in the  treasury of Gearon)
         shall,  by virtue of the Merger and  without  any action on the part of
         the holder thereof, be converted into the right to receive its pro-rata
         share of the following:

                           (i) with respect to Dan King  Brainard,  Jeff Ebihara
                  and  Doug   Wiest,   555,555,   22,221  and   44,444   shares,
                  respectively,  of Class A Common  Stock,  par  value  $.01 per
                  share, of ATS (the "ATS Class A Common Stock") (being a number
                  of shares of ATS Class A Common Stock with an agreed upon fair
                  market   value   of   $5,000,000,   $200,000   and   $400,000,
                  respectively,  based on an agreed  upon per share value of the
                  ATS Class A Common Stock of $9.00, which ATS represents is not
                  more than the price per share at which  shares  are to be sold
                  pursuant  to the ATS Private  Placement)  to be issued to each
                  such Gearon  stockholder in proportion to the number of shares
                  of Gearon Common Stock held by such  stockholder to the number
                  of shares of Gearon Common Stock held by all such stockholders
                  (the "Gearon Employees Consideration"); and


<PAGE>


                                       -2-

                           (ii) with respect to the Gearon  Stockholder  and The
                  1997 Gearon  Family Trust,  (A) 4,240,002 and 471,111  shares,
                  respectively,  of ATS Class A Common  Stock (being a number of
                  shares of ATS Class A Common  Stock  with an agreed  upon fair
                  market value of $42,400,000  based on an agreed upon per share
                  value of the ATS  Class A Common  Stock of  $9.00,  which  ATS
                  represents  is not more  than  the  price  per  share at which
                  shares are to be sold  pursuant to the ATS Private  Placement)
                  (the  "Gearon  Common  Stock  Consideration"),  and (B)  $28.8
                  million  and  $3.2  million,   respectively,   in  immediately
                  available funds (the "Cash  Consideration"  and  collectively,
                  with  the  Gearon  Common  Stock  Consideration,  the  "Merger
                  Consideration"   which  term  shall  include  any   adjustment
                  pursuant to the provisions of this Section).

         Notwithstanding  the  foregoing,  the Cash  Consideration  shall be (i)
         increased by an amount  equal to the Net Working  Capital of Gearon (if
         positive)  on and as of the  Closing  Date,  and (ii)  decreased  by an
         amount equal to the Net Working  Capital of Gearon (if negative) on and
         as of the Closing Date. The term "Exchange Merger  Consideration" shall
         mean an  amount  equal to the  Gearon  Employees  Consideration  or the
         Merger  Consideration,  as the case may be,  divided  by the  aggregate
         number of shares of Gearon  Common Stock (the "Gearon  Shares")  issued
         and  outstanding  at the  Effective  Time  and  held of  record  at the
         Effective  Time by the Persons (x) named in paragraph  (i), in the case
         of the Gearon Employees Consideration, and (y) named in paragraph (ii),
         in the  case of the  Gearon  Common  Stock  Consideration  and the Cash
         Consideration.

          At  the  Effective   Time,  all  Gearon  Shares  shall  no  longer  be
outstanding and shall  automatically  be canceled and retired and shall cease to
exist,  and certificates  previously  evidencing any such Gearon Shares (each, a
"Certificate")  shall  thereafter  represent  the  right  to  receive,  upon the
surrender of such  Certificate in accordance with the provisions of Section 3.2,
the Exchange  Merger  Consideration  multiplied  by the number of Gearon  Shares
represented by such Certificate, and a holder of more than one Certificate shall
have the right to receive the Exchange  Merger  Consideration  multiplied by the
number of Gearon Shares represented by all such Certificates. In lieu of issuing
fractional  shares,  ATS shall convert the holder's right to receive ATS Class A
Common Stock  pursuant to the provisions of this Section into a right to receive
the highest whole number of shares of ATS Class A Common Stock  constituting the
Exchange Merger  Consideration plus cash equal to the fraction of a share of ATS
Class A Common Stock to which the holder would otherwise be entitled  multiplied
by $9.00,  and the Exchange Merger  Consideration  to which a holder is entitled
shall be deemed to be such  number  of shares of ATS Class A Common  Stock,  the
Cash  Consideration and such cash. The holders of such  Certificates  previously
evidencing  Gearon Shares  outstanding  immediately  prior to the Effective Time
shall cease to have any rights with  respect to such  Gearon  Shares,  except as
otherwise provided herein or by Applicable Law. "

         2. The definitions of "Collateral  Documents" and "Gearon" appearing in
Appendix A of the Merger Agreement are each hereby deleted and the following new
definitions are inserted in their places, respectively:



<PAGE>


                                       -3-

         "Collateral  Documents  shall mean the  Agreement and Plan of Merger by
and among ATSI,  Communications  Towers,  Inc. and the Gearon  Stockholder,  the
Indemnity  Escrow  Agreement,  the ATS  Noncompetition  Agreements,  the  Gearon
Employment  Agreement,  the Gearon Notes,  the Gearon  Security  Agreement,  the
Gearon Investment  Letters,  the Certificate of Merger,  the Articles of Merger,
and any other agreement,  certificate,  contract, instrument, notice, opinion or
other  document  delivered  pursuant to the  provisions of this Agreement or any
Collateral Document."

         "Gearon  shall have the meaning  given to it in the  Preamble and shall
include CTI, unless the context otherwise implies."

         3. All references in the Merger Agreement and each Collateral  Document
to "American  Tower  Systems,  Inc." are hereby deleted and replaced by the name
"American Tower Systems  (Delaware),  Inc.," and all references to "ATSI" in the
Merger  Agreement  and each  Collateral  Document  shall be  deemed  to refer to
American Tower Systems (Delaware), Inc.

         4. Each of ATS, ATSI, Gearon and the Gearon Stockholder  represents and
warrants that all requisite  corporate and other action  necessary for the valid
execution  and delivery of this  Amendment  No. 1 has been duly and  effectively
taken.

         5. Each capitalized term used herein without  definition shall have the
same meaning herein as is given to such term in the Merger Agreement.

         6. The Merger  Agreement as amended hereby is ratified and confirmed in
all respects and shall continue in full force and effect.

         7. This  Amendment  No. 1 may be executed in one or more  counterparts,
and by the different Parties hereto in separate counterparts, each of which when
executed shall be deemed to be an original but all of which taken together shall
constitute one and the same agreement.



                  [Remainder of page intentionally left blank.]


<PAGE>


                                       -4-

         IN WITNESS WHEREOF,  the parties have caused this Amendment No. 1 to be
executed  as of the  date  first  written  above by  their  respective  officers
thereunto duly authorized.

                                       American Tower Systems Corporation


                                       By:_____________________________________
                                            Name:
                                            Title:


                                       American Tower Systems (Delaware), Inc.


                                       By:_____________________________________
                                            Name:
                                            Title:

                                       Gearon & Co., Inc.


                                       By:______________________________________
                                            Name:
                                            Title:


                                       Gearon Stockholder



                                       J. Michael Gearon, Jr.


                                                                    EXHIBIT 10.2

                       AMERICAN TOWER SYSTEMS CORPORATION


                            STOCK PURCHASE AGREEMENT


         THIS AGREEMENT (this  "Agreement") is made as of January 8, 1998 by and
among American Tower Systems  Corporation,  a Delaware  corporation ("ATS"), and
each  of  the   undersigned   individuals   (individually   a  "Purchaser"   and
collectively, the "Purchasers").

         WHEREAS, the Purchasers desire to purchase, and ATS is willing to sell,
shares of Class A Common Stock,  par value $.01 per share,  of ATS (the "Class A
Common Stock"), shares of Class B Common Stock, par value $.01 per share, of ATS
(the "Class B Common Stock),  and shares of Class C Common Stock, par value $.01
per share, of ATS (the "Class C Common Stock and,  collectively with the Class A
Common Stock and the Class B Common Stock,  the "ATS Common Stock"),  all on the
terms and subject to the conditions of this Agreement; and

         WHEREAS,  ATS is party to an Agreement and Plan of  Reorganization  (as
heretofore  amended,  the "Gearon Merger  Agreement"),  dated as of November 21,
1997, with Gearon & Company, Inc., a Georgia corporation ("Gearon"), pursuant to
which Gearon will be merged (the "Gearon  Merger") with and into ATS and it is a
condition  of the  consummation  of the Gearon  Merger that an  agreement of the
nature contemplated hereby shall have been executed,  delivered and consummated;
and

         WHEREAS,  ATS is party to an Agreement and Plan of Reorganization  (the
"ATC Merger  Agreement"),  dated as of December 12, 1997,  with  American  Tower
Corporation,  a  Delaware  corporation  ("ATC"),  pursuant  to which ATC will be
merged  (the  "ATC  Merger")  with  and into  ATS and it is a  condition  of the
consummation  of the ATC Merger  that an  agreement  of the nature  contemplated
hereby shall have been executed, delivered and consummated; and

         WHEREAS,  ATS is a  wholly-owned  subsidiary of American  Radio Systems
Corporation, a Delaware corporation ("ARS"); and

         WHEREAS,  ATS and the  Purchasers  wish to  provide  for the  terms and
conditions of the purchase and sale of the ATS Common Stock and certain  related
matters;

         NOW,  THEREFORE,  for and in  consideration of the mutual covenants and
agreements herein contained,  in order to satisfy a condition to consummation of
each of the Gearon Merger and the ATC Merger, and other valuable  consideration,
the receipt and adequacy  whereof are hereby  acknowledged,  the parties hereto,
intending to be legally bound, do hereby covenant and agree as follows:



<PAGE>



         SECTION 1.        Authorization and Closing.

         (a)  Authorization of the Securities.  ATS has authorized the issue and
sale to the  Purchasers,  and the  Purchasers,  severally and not jointly,  have
agreed to  purchase,  the  respective  number of shares of ATS Common  Stock set
forth below  opposite the names of the  Purchasers  (collectively,  the "Subject
Shares") at a purchase price equal to $10.00 per share.
<TABLE>
<CAPTION>

         Name of Purchaser                           Number of Shares         Class of Stock
         -----------------                           ----------------         --------------
         <S>                                            <C>                       <C>
          Steven B. Dodge*                               4,000,000                 Class B
          Alan Box*                                        450,000                 Class A
          Charlton H. Buckley                              300,000                 Class A
          Chase Equity Associates                        2,000,000                 Class C
          James S. Eisenstein                               25,000                 Class A
          Arthur C. Kellar                                 400,000                 Class A
          Steven J. Moskowitz                               25,000                 Class A
          Thomas H. Stoner*                                465,000                 Class B
          Katharine E. Stoner*                              22,500                 Class B
          Theodore A. Stoner                                15,000                 Class A
          Thomas H. Stoner, Jr                              26,550                 Class A
          Thomas H. Stoner Irrevocable Trust                80,000                 Class B
          Ruth H. Stoner Irrevocable Trust                  82,450                 Class B
          Alden Elizabeth Stoner 35 Trust                   22,500                 Class A
          Thomas and Katharine Stoner Foundation            36,000                 Class A
          Ruth Rochelle Stoner                              50,000                 Class A
<FN>                     
*        Indicates that payment to be made in the form of a Purchaser Note (collectively, the "Note
         Purchasers").
</FN>
</TABLE>


         (b) Purchase and Sale of the Subject Stock. At the Closing,  subject to
the  terms  and  conditions  set forth  herein,  ATS shall  issue to each of the
Purchasers, and each of the Purchasers, severally and not jointly, shall acquire
from ATS, the respective number of Subject Shares set forth in Section 1(a). The
obligation  of each of the  Purchasers  shall  not be  conditioned  on any other
Purchaser  satisfying  its  obligations  under  this  Agreement.  Payment of the
purchase price shall be made by the delivery by each Purchaser as follows:

                  (i) each of the  Purchasers,  other than the Note  Purchasers,
         will  make  payment  in the  form  of a wire  transfer  of  immediately
         available funds or bank cashier's or certified check; and

                  (ii) each of the Note Purchasers will make payment in the form
         of  a  promissory   note   (individually,   a   "Purchaser   Note"  and
         collectively,  the  "Purchaser  Notes")  substantially  in the  form of
         Exhibit A attached  hereto and made a part hereof.  Each Purchaser Note
         shall be secured by a pledge of shares of Common Stock,  par value $.01
         per share, of ARS (the "ARS Common Stock"),  pursuant to the provisions
         of  a  pledge   agreement   (individually  a  "Pledge   Agreement"  and
         collectively  the  "Pledge  Agreements")  substantially  in the form of
         Exhibit B attached hereto and made a part hereof.

         (c)  The  Closing.  The  closing  (the  "Closing")  of  the  issue  and
acquisition  of the Subject Shares shall take place at the offices of Sullivan &
Worcester,   New  York,  New  York  at  10:00  a.m.   simultaneously   with  the
effectiveness  of the Gearon  Merger,  or at such other date and place as may be
mutually agreeable

                                       -2-


<PAGE>



to ATS and a majority in interest of the Purchasers.  At the Closing,  ATS shall
deliver to each of the Purchasers,  against  delivery of cash or the appropriate
Purchaser Notes and Pledge  Agreements,  as the case may be, stock  certificates
evidencing the Subject  Shares to which the respective  Purchasers are entitled,
registered  in the  name of  such  Purchaser  or his or its  nominee.  Any  wire
transfer  of funds  shall be made to such bank  account in the United  States as
shall have been designated in writing by ATS not less than two (2) business days
prior to the Closing.  ATS shall  promptly  notify each of the Purchasers of the
proposed date of consummation of the Gearon Merger.

         SECTION 2. Conditions of each Purchaser's Obligation. The obligation of
each  Purchaser to acquire the Subject  Shares to be purchased by such Purchaser
at the  Closing  is subject  to the  satisfaction  (or waiver in writing by such
Purchaser) as of the Closing of the following conditions:

                  (a)   Representations   and   Warranties;    Covenants.    The
         representations and warranties contained in Section 4 shall be true and
         correct in all  material  respects  at and as of the  Closing as though
         then made,  except to the extent of changes caused by the  transactions
         expressly  contemplated  herein,  and ATS shall have  performed  in all
         material  respects all of the covenants  required to be performed by it
         hereunder prior to the Closing.

                  (b) CBS Merger Agreement. ARS, R Acquisition Corp., a Delaware
         corporation  ("CBS Sub"), a wholly-owned  subsidiary of CBS Corporation
         (formerly   Westinghouse   Electric   Corporation),    a   Pennsylvania
         corporation  ("CBS")) and CBS have heretofore entered into an Agreement
         and Plan of Merger,  dated as of  September  19,  1997,  as amended and
         restated by an Amended and Restated Agreement and Plan of Merger, dated
         as of December  18, 1997 (as so amended and  restated,  the "CBS Merger
         Agreement"),  and the CBS Merger  Agreement  shall be in full force and
         effect as of the Closing and shall not have been amended or modified in
         any respect materially adverse to ATS.

                  (c) Gearon Merger Agreement. The Gearon Merger Agreement shall
         be in full force and effect as of the  Closing  and shall not have been
         amended or modified in any respect  materially  adverse to ATS, and the
         Gearon Merger shall have been or  simultaneously to the Closing will be
         consummated  substantially  in accordance  with the terms of the Gearon
         Merger Agreement.

                  (d) ATC Merger Agreement. The ATC Merger Agreement shall be in
         full force and effect as of the Closing and shall not have been amended
         or modified in any respect materially adverse to ATS.

                  (e) Registration Rights Agreement. ATS shall have executed and
         delivered to each of the Purchasers an agreement  substantially  in the
         form  of  Exhibit  C  attached  hereto  and  made  a part  hereof  (the
         "Registration Rights Agreement").

                  (f) Blue Sky Clearance.  ATS shall have made all filings under
         applicable  state  securities laws necessary to consummate the issue of
         the Subject Shares  pursuant to this Agreement in compliance  with such
         laws.

                  (g) Legal  Opinion.  ATS shall have  delivered  to each of the
         Purchasers an opinion of Sullivan & Worcester LLP,  counsel for ATS, as
         to the due  organizations  and  corporate  existence  of  ATS,  the due
         authorization,   execution,   delivery  and  binding   effect  of  this
         Agreement,  and the due authorization and valid issuance of the Subject
         Shares and their fully paid and nonassessable status.



                                       -3-


<PAGE>



                  (h) Proceedings.  All corporate and other proceedings taken or
         required  to be  taken  by  ATS in  connection  with  the  transactions
         contemplated  hereby to be  consummated  at or prior to the Closing and
         all documents incident thereto shall be reasonably satisfactory in form
         and substance to the Purchasers and their counsel.

                  (i) Closing Documents. ATS shall have delivered to each of the
         Purchasers all of the following documents:

                           (i) an officer's  certificate,  dated the date of the
                  Closing,  stating that the conditions  specified in paragraphs
                  (a) through (f) of this  Section  have been  satisfied  in all
                  material respects;

                           (ii) certified copies of the resolutions duly adopted
                  by the ATS board of directors  and, to the extent  applicable,
                  ARS,  as  the  sole   stockholder  of  ATS,   authorizing  the
                  execution, delivery and performance of this Agreement, the CBS
                  Merger Agreement,  the Gearon Merger Agreement, the ATC Merger
                  Agreement  and  each  of  the  other  agreements  contemplated
                  hereby,   the  issuance  of  the  Subject   Shares,   and  the
                  consummation  of all other  transactions  contemplated by this
                  Agreement;

                           (iii) certified copies of the Restated Certificate of
                  Incorporation  (the "Restated  Certificate") and the bylaws of
                  ATS, each as in effect at the Closing;

                           (iv)  certified  copies of the CBS Merger  Agreement,
                  the Gearon Merger Agreement and the ATC Merger Agreement as in
                  effect at the Closing;

                           (v)  copies  of  all  third  party  and  governmental
                  consents,  approvals and filings  required in connection  with
                  the  consummation  of  the  transactions  contemplated  hereby
                  (including,  without  limitation,  all  state  securities  law
                  filings); and

                           (vi)   such   other   documents,    instruments   and
                  certificates relating to the transactions contemplated by this
                  Agreement  as  any   Purchaser  or  his  or  its  counsel  may
                  reasonably request.

         SECTION 3.  Conditions  of ATS'  Obligation.  The  obligation of ATS to
issue and sell the Subject Shares to each Purchaser at the Closing is subject to
the  satisfaction  (or  waiver  in  writing  by  ATS) as of the  Closing  of the
following conditions:

                  (a)   Representations   and   Warranties;    Covenants.    The
         representations and warranties of such Purchaser contained in Section 5
         shall be true and  correct in all  material  respects  at and as of the
         Closing as though then made,  except to the extent of changes caused by
         the  transactions  expressly  contemplated  herein,  and such Purchaser
         shall have  performed  in all material  respects  all of the  covenants
         required to be performed by him or it hereunder prior to the Closing.

                  (b) CBS Merger Agreement. The CBS Merger Agreement shall be in
         full force and effect as of the Closing and shall not have been amended
         or modified in any respect materially adverse to ATS.

                  (c) Gearon Merger Agreement. The Gearon Merger Agreement shall
         be in full force and effect as of the  Closing  and shall not have been
         amended or modified in any respect materially

                                       -4-


<PAGE>



         adverse to ATS,  and the  Gearon  Merger  shall  have been or  proposed
         simultaneously  with the  Closing to be  consummated  substantially  in
         accordance with the terms of the Gearon Merger Agreement.

                  (d) ATC Merger Agreement. The ATC Merger Agreement shall be in
         full force and effect as of the Closing and shall not have been amended
         or modified in any respect materially adverse to ATS.

                  (e)  Registration  Rights  Agreement.  Each of the  Purchasers
         shall  have  executed  and  delivered  to ATS the  Registration  Rights
         Agreement.

                  (f) Blue Sky  Clearance.  The  issue  and sale of the  Subject
         Stock shall not be in  violation  of any  applicable  state  securities
         laws.

                  (g) Proceedings.  All corporate and other proceedings taken or
         required  to  be  taken  by  such  Purchaser  in  connection  with  the
         transactions  contemplated  hereby to be consummated at or prior to the
         Closing  and  all  documents   incident  thereto  shall  be  reasonably
         satisfactory in form and substance to ATS and its counsel.

                  (h) Closing Documents.  Such Purchaser shall have delivered to
         ATS  such  documents,  instruments  and  certificates  relating  to the
         transactions  contemplated  by this Agreement as ATS or its counsel may
         reasonably  request  and,  in the  case  of the  Note  Purchasers,  the
         Purchaser Note and the Pledge Agreement,  together with evidence of the
         pledge  of  shares  of ARS  Common  Stock  contemplated  by the  Pledge
         Agreement.

                  SECTION  4.  Representations  and  Warranties  of  ATS.  As  a
material  inducement to the Purchasers to enter into this Agreement and purchase
the  Subject  Shares,  ATS  hereby  makes  the  following   representations  and
warranties to each of the Purchasers.

                  (a)  Organization  and  Corporate  Power.  ATS and each of its
         subsidiaries is an Entity duly organized,  validly existing and in good
         standing  under the laws of its  jurisdiction  of  organization  and is
         qualified to do business in each  jurisdiction  in which the failure so
         to qualify  would  reasonably  be expected  to have a material  adverse
         effect on the business,  financial condition or results of operation of
         ATS  and  its  subsidiaries  taken  as a  whole.  ATS  and  each of its
         subsidiaries has all requisite  corporate and other power and authority
         and all material licenses,  permits and authorizations necessary to own
         and operate its properties, to carry on its businesses as now conducted
         and  presently  proposed  to be  conducted  and, in the case of ATS, to
         execute and deliver and consummate  the  transactions  contemplated  by
         this Agreement.

                  (b) Material Statements and Omissions;  Absence of Events. The
         information  with  respect  to  ATS  included  in the  ATS  Information
         Statement/Prospectus, dated December , 1997 heretofore delivered by ATS
         to each of the Purchasers (the "ATS Information  Statement/Prospectus")
         does not and will not contain any untrue  statement of a material  fact
         and does not and will not omit to state any material  fact  required to
         make  any  statement  contained  herein  or  therein,  in  light of the
         circumstances  under which they were made,  not  misleading.  Since the
         date of the  most  recent  financial  statements  set  forth in the ATS
         Information Statement/Prospectus, except to the extent described in the
         ATS  Information  Statement/Prospectus,  there  has  been  no  material
         adverse change in ATS.

                  (c)      Capital Stock and Related Matters.


                                       -5-


<PAGE>



                  (i) The  authorized  and issued capital stock of ATS is as set
         forth in the ATS  Information  Statement/Prospectus.  ATS does not have
         outstanding any stock or securities convertible or exchangeable for any
         shares of its  capital  stock or  containing  any profit  participation
         features,  nor  does it have  outstanding  any  rights  or  options  to
         subscribe  for  or to  purchase  its  capital  stock  or any  stock  or
         securities  convertible  into or exchangeable  for its capital stock or
         any stock  appreciation  rights or phantom  stock plans,  except as set
         forth in the ATS Information  Statement/Prospectus.  ATS is not subject
         to any obligation  (contingent or otherwise) to repurchase or otherwise
         acquire  or retire  any shares of its  capital  stock or any  warrants,
         options  or other  rights to  acquire  its  capital  stock.  All of the
         outstanding  shares of the ATS Common Stock are, and all of the Subject
         Shares and the Exchanged  Shares will,  upon  issuance  pursuant to the
         provisions of this  Agreement,  be, duly  authorized,  validly  issued,
         fully paid and nonassessable.

                  (ii) There are no statutory or, to the best of ATS' knowledge,
         contractual  stockholder  preemptive  rights or rights of refusal  with
         respect to the issuance of the Subject Shares or the Exchanged  Shares.
         ATS has not violated any applicable federal or state securities laws in
         connection  with the  offer,  sale or  issuance  of any of its  capital
         stock,  and,  based  on  the  representations  and  warranties  of  the
         Purchasers set forth in Section 5(g),  the offer,  sale and issuance of
         the Subject  Shares and the Exchanged  Shares  hereunder do not require
         registration  under  the  Securities  Act  of  1933,  as  amended  (the
         "Securities Act") or any applicable state securities laws.

                  (d)  Authorization;  No Breach.  The  execution,  delivery and
         performance of this Agreement, the CBS Merger Agreement, the ATS Merger
         Agreement,  the Registration  Rights Agreement and all other agreements
         contemplated  hereby to which ATS is or will be a party  have been duly
         authorized by ATS. This Agreement, the CBS Merger Agreement, the Gearon
         Merger  Agreement,  the ATC Merger Agreement,  the Registration  Rights
         Agreement and all other agreements contemplated hereby each constitutes
         a valid and binding  obligation of ATS,  enforceable in accordance with
         its terms,  except as (i) the enforceability  thereof may be limited by
         bankruptcy,   reorganization,    insolvency,   moratorium,   fraudulent
         conveyance  or  other  laws  of  general  applicability  affecting  the
         enforcement  of  creditors'  or  secured  parties'  rights or  debtors'
         obligations generally and (ii) the availability of specific performance
         or other equitable  remedies may be limited by equitable  principles of
         general   applicability   (whether  such  matter  is  considered  in  a
         proceeding at law or in equity).  The (x) execution and delivery by ATS
         of this Agreement,  the  Registration  Rights  Agreement and the Pledge
         Agreement,  (y) offering,  sale and issuance of the Subject  Shares and
         the Exchanged Shares  hereunder,  and (z) fulfillment of and compliance
         with the  respective  terms hereof and thereof by ATS, do not and shall
         not,  except in  respect of clause (z)  above,  for  filings  and other
         actions to be performed  upon the  occurrence of certain future events,
         as contemplated by the Registration Rights Agreement, (i) conflict with
         or result in a breach of the terms,  conditions or provisions  of, (ii)
         constitute a default  under,  (iii) result in the creation of any lien,
         security interest,  charge or encumbrance upon ATS' or any subsidiary's
         capital  stock or assets  pursuant  to,  (iv) give any third  party the
         right to modify,  terminate or accelerate  any  obligation  under,  (v)
         result in a violation of, or (vi) require any  authorization,  consent,
         approval,  exemption  or other  action  by or  notice  to any  court or
         administrative or governmental body pursuant to, the charter or by-laws
         or other organizational documents of ATS or any subsidiary, or any law,
         statute,  rule or regulation to which ATS or any subsidiary is subject,
         or any contract,  agreement,  instrument,  order, judgment or decree to
         which ATS or any  subsidiary  is  subject,  which  such  authorization,
         consent, approval,  exemption,  action or notice has not been obtained,
         except in all cases for such  exceptions as would not,  individually or
         in the  aggregate,  have a  material  adverse  effect on the  business,
         financial   conditions   or  results  of   operation  of  ATS  and  its
         subsidiaries taken as a whole.


                                       -6-


<PAGE>



                  (e) Brokerage.  There are no claims for brokerage commissions,
         finders'  fees  or  similar   compensation   in  connection   with  the
         transactions contemplated by this Agreement based on any arrangement or
         agreement  binding upon ATS or any subsidiary.  ATS shall pay, and hold
         each of the Purchasers harmless against, any liability, loss or expense
         (including,   without  limitation,   reasonable   attorneys'  fees  and
         out-of-pocket expenses) arising in connection with any such claim.

                  (f) Governmental Consent, etc. No permit, consent, approval or
         authorization  of, or declaration  to or filing with, any  governmental
         authority is required in connection  with the  execution,  delivery and
         performance  by  ATS  of  this   Agreement  or  the  other   agreements
         contemplated   hereby,   or  the  consummation  by  ATS  of  any  other
         transactions  contemplated  hereby  or  thereby,  except  as  expressly
         contemplated herein or therein or in the exhibits hereto or thereto.

         SECTION 5.  Representations  and  Warranties  of each  Purchaser.  As a
material  inducement to ATS to enter into this  Agreement and issue and sell the
Subject  Shares and  exchange  the  Exchanged  Shares,  each of the  Purchasers,
severally  and not jointly with  respect to himself or itself,  hereby makes the
following   representations  and  warranties  to  ATS  and  each  of  the  other
Purchasers.

                  (a) Organization and Power. Such Purchaser,  if a corporation,
         partnership,  trust or other legal entity,  is duly organized,  validly
         existing and in good  standing  under the laws of its  jurisdiction  of
         organization  and has all requisite  corporate,  partnership,  trust or
         other power and  authority  to execute and deliver and  consummate  the
         transactions contemplated by this Agreement.

                  (b)  Authorization;  No Breach.  The  execution,  delivery and
         performance of this Agreement,  the  Registration  Rights Agreement and
         all other agreements  contemplated hereby (including without limitation
         in the case of the  Note  Purchasers,  the  Purchaser  Note and  Pledge
         Agreement to be delivered by such Purchaser) to which such Purchaser is
         or will be a party have been duly  authorized by such  Purchaser.  This
         Agreement,  the Registration  Rights Agreement and all other agreements
         contemplated  hereby (including  without  limitation in the case of the
         Note  Purchasers,  the  Purchaser  Note  and  Pledge  Agreement  to  be
         delivered by such  Purchaser)  to which such  Purchaser is or will be a
         party  each  constitutes  a  valid  and  binding   obligation  of  such
         Purchaser,  enforceable in accordance with its terms, except as (i) the
         enforceability  thereof may be limited by  bankruptcy,  reorganization,
         insolvency,  moratorium, fraudulent conveyance or other laws of general
         applicability  affecting  the  enforcement  of  creditors'  or  secured
         parties'  rights  or  debtors'  obligations   generally  and  (ii)  the
         availability of specific performance or other equitable remedies may be
         limited by equitable principles of general applicability  (whether such
         matter is  considered  in a  proceeding  at law or in equity).  The (x)
         execution  and  delivery  by  such  Purchaser  of this  Agreement,  the
         Registration  Rights  Agreement and all other  agreements  contemplated
         hereby  (including   without   limitation  in  the  case  of  the  Note
         Purchasers,  the Purchaser Note and Pledge Agreement to be delivered by
         such Purchaser) to which such Purchaser is or will be a party,  and (y)
         fulfillment  of and  compliance  with the  respective  terms hereof and
         thereof by such  Purchaser,  do not and shall not, except in respect of
         clause (y) above,  for filings and other  actions to be performed  upon
         the  occurrence  of  certain  future  events,  as  contemplated  by the
         Registration Rights Agreement,  (i) conflict with or result in a breach
         of the terms,  conditions or provisions  of, (ii)  constitute a default
         under,  (iii)  result in the creation of any lien,  security  interest,
         charge or encumbrance  upon such  Purchaser's  assets pursuant to, (iv)
         give any third party the right to modify,  terminate or accelerate  any
         obligation  under,  (v) result in a violation  of, or (vi)  require any
         authorization,  consent,  approval,  exemption  or other  action  by or
         notice to any court or administrative or governmental body pursuant to,
         any law,  statute,  rule or  regulation  to  which  such  Purchaser  is
         subject, or any contract,  agreement,  instrument,  order,  judgment or
         decree to which such  Purchaser is subject,  which such  authorization,
         consent, approval, exemption, action or notice has not been obtained.

                                       -7-


<PAGE>




                  (c) Brokerage.  There are no claims for brokerage commissions,
         finders'  fees  or  similar   compensation   in  connection   with  the
         transactions contemplated by this Agreement based on any arrangement or
         agreement  binding upon such  Purchaser.  Such Purchaser shall pay, and
         hold  each  of ATS and  the  other  Purchasers  harmless  against,  any
         liability, loss or expense (including,  without limitation,  reasonable
         attorneys' fees and out-of-pocket  expenses) arising in connection with
         any such claim.

                  (d) ARS Common  Stock.  All shares of ARS Common Stock pledged
         by each Note Purchaser  pursuant to the provisions of such  Purchaser's
         Pledge  Agreement,  have,  to such  Purchaser's  knowledge,  been  duly
         authorized,   validly  issued,  fully  paid  and  nonassessable;   such
         Purchaser   owns  such   shares   free  and  clear  of  all  liens  and
         encumbrances, other than those created by such Pledge Agreement.

                  (e) Governmental Consent, etc. No permit, consent, approval or
         authorization  of, or declaration  to or filing with, any  governmental
         authority is required in connection  with the  execution,  delivery and
         performance by such Purchaser of this Agreement or the other agreements
         contemplated hereby, or the consummation by such Purchaser of any other
         transactions  contemplated  hereby  or  thereby,  except  as  expressly
         contemplated herein or therein or in the exhibits hereto or thereto.

                  (f)   Investment   Representation.   Such   Purchaser   is  an
         "accredited investor" as such term is defined in Rule 501 of Regulation
         D ("Regulation  D")  promulgated  under the Securities Act. The Subject
         Shares and, if applicable,  the Exchanged Shares to be acquired by such
         Purchaser are being  acquired  solely for the account of such Purchaser
         for purposes of investment and not with a view to the sale, transfer or
         other distribution  thereof,  as those terms are used in the Securities
         Act and the rules and  regulations  promulgated  thereunder;  provided,
         however, that nothing contained herein shall prevent such Purchaser and
         subsequent  holders of  Subject  Shares  or, if  applicable,  Exchanged
         Shares  from  transferring  such  securities  in  compliance  with  the
         applicable   provisions  of  the  Securities  Act  (including   without
         limitation  Rule  144  promulgated  thereunder)  and  applicable  state
         securities laws. Each Purchaser,  severally and not jointly,  covenants
         and agrees that he or it will not sell,  assign,  transfer or otherwise
         dispose of any of the Subject Share or, if applicable, Exchanged Shares
         to be acquired by such  Purchaser in violation of the Securities Act or
         applicable  state  securities laws. Each certificate for Subject Shares
         and Exchanged  Shares shall be imprinted with a legend in substantially
         the following form:

                  "THE SECURITIES  REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                  REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED.  THE
                  TRANSFER OF THE SECURITIES  REPRESENTED BY THIS CERTIFICATE IS
                  SUBJECT  TO THE  CONDITIONS  SPECIFIED  IN THE STOCK  PURCHASE
                  AGREEMENT,  DATED AS OF  JANUARY , 1998,  BETWEEN  THE  ISSUER
                  ("ATS") AND THE PURCHASERS NAMED THEREIN, AND ATS RESERVES THE
                  RIGHT TO REFUSE THE  TRANSFER  OF SUCH  SECURITIES  UNTIL SUCH
                  CONDITIONS  HAVE BEEN FULFILLED WITH RESPECT TO SUCH TRANSFER.
                  A COPY OF SUCH  CONDITIONS  SHALL BE  FURNISHED  BY ATS TO THE
                  HOLDER HEREOF UPON WRITTEN REQUEST AND WITHOUT CHARGE."

         SECTION 6.        Miscellaneous.


                                       -8-


<PAGE>



         (a)  Termination.  This  Agreement  may be  terminated  with the mutual
consent of the Purchasers and ATS.

         (b) Amendment. This Agreement may be amended, from time to time, by the
parties  hereto at any time prior to the Closing Date but only by an  instrument
in  writing  signed by the  parties  hereto or their  respective  successors  or
assigns.

         (c) Waiver.  At any time prior to the Closing  Date,  the parties  may,
either  generally or in a  particular  instance  and either  retrospectively  or
prospectively,  extend the time for the performance of any of the obligations or
other  acts of the  other,  and waive  compliance  by the other  with any of the
agreements, covenants, conditions or other provisions contained herein. Any such
extension or waiver shall be valid only if set forth in an instrument in writing
signed by the party or parties to be bound thereby.

         (d) Expenses.  ATS agrees to pay the reasonable  out-of-pocket expenses
of the Purchasers  incident to the  negotiation,  preparation,  performance  and
enforcement  of this Agreement  (including  all reasonable  fees and expenses of
Purchasers'  counsel (not to exceed in the aggregate  $20,000),  accountants and
other  consultants,  advisors and  representatives  for all  activities  of such
persons undertaken pursuant to this Agreement).

         (e)  Notices.  All  notices  and  other  communications  which  by  any
provision of this Agreement are required or permitted to be given shall be given
in writing  and shall be (a) mailed by  first-class  or  express  mail,  postage
prepaid, or by recognized courier service, (b) sent by telecopy or other form of
rapid  transmission,  confirmed  by mailing  (by first  class or  express  mail,
postage  prepaid,  or by recognized  courier  service)  written  confirmation at
substantially  the  same  time as such  rapid  transmission,  or (c)  personally
delivered to the receiving  party (which if, other than an individual,  shall be
an officer or other responsible party of the receiving party).  All such notices
and communications shall be mailed, sent or delivered as follows:

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

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

         If to any of the  Purchasers,  at the  address  set  forth in the stock
records of ATS;

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

         (f)  Specific  Performance;  Other  Rights  and  Remedies.  Each  party
recognizes and agrees that in the event the other party should refuse to perform
any of its  obligations  under  this  Agreement,  the  remedy  at law  would  be
inadequate and agrees that for breach of such  provisions,  each party shall, in
addition to such other  remedies as may be  available to it at law or in equity,
be  entitled  to  injunctive  relief and to enforce  its rights by an action for
specific  performance  to the extent  permitted by  applicable  law.  Each party
hereby waives any  requirement  for security or the posting of any bond or other
surety in connection with any

                                       -9-


<PAGE>



temporary or permanent award of injunctive, mandatory or other equitable relief.
Nothing  herein  contained  shall be  construed as  prohibiting  each party from
pursuing any other remedies  available to it under applicable law or pursuant to
the provisions of this Agreement for such breach or threatened breach, including
without limitation the recovery of damages.

         (g) Survival of Representations,  Warranties, Covenants and Agreements.
All of the  representations,  warranties,  covenants and agreements set forth in
this Agreement shall survive the Closing.

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

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

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

         (k)  Governing  Law. The  validity,  interpretation,  construction  and
performance of this Agreement  shall be governed by, and construed in accordance
with,  the  applicable  laws of the United States of America and the laws of The
Commonwealth of Massachusetts applicable to contracts made and performed in such
State and, in any event, without giving effect to any choice or conflict of laws
provision or rule that would cause the application of domestic  substantive laws
of any other jurisdiction,  except to the extent the corporate laws of the State
of  Delaware  are  applicable.  Anything  in  this  Agreement  to  the  contrary
notwithstanding,  in the event of any dispute  between the parties which results
in a legal action, litigation or other proceeding, the prevailing party shall be
entitled to receive from the non-prevailing  party  reimbursement for reasonable
legal fees and expenses  incurred by such prevailing party in such legal action,
litigation or other proceeding.

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

                                      -10-


<PAGE>




         (m)  Entire  Agreement.   This  Agreement   (together  with  the  other
agreements,  instruments and other documents  delivered in connection  herewith)
constitutes  the entire  agreement  of the parties  with  respect to the subject
matter hereof and  supersedes  all prior  agreements,  arrangements,  covenants,
promises,   conditions,   understandings,   inducements,   representations   and
negotiations,  expressed or implied,  oral or written,  among the parties,  with
respect to the  subject  matter  hereof  and  supersedes  all prior  agreements,
arrangements,   covenants,  promises,  conditions,  undertakings,   inducements,
representations,  warranties  and  negotiations,  expressed or implied,  oral or
written, between the parties, with respect to the subject matter hereof. Each of
the  parties is a  sophisticated  investor  or legal  entity that was advised by
experienced  counsel and, to the extent it deemed  necessary,  other advisors in
connection with this Agreement. Each of the parties hereby acknowledges that (i)
none of the parties has relied or will rely in respect of this  Agreement or the
transactions   contemplated   hereby  upon  any  document  or  written  or  oral
information  previously furnished to or discovered by it or its representatives,
other than this  Agreement  (or such of the  foregoing  as are  delivered at the
Closing,  (ii) there are no covenants or agreements by or on behalf of any party
or any  of  its  respective  affiliates  or  representatives  other  than  those
expressly set forth in this Agreement and the other agreements,  instruments and
other  documents  delivered  in  connection  herewith,  and (iii)  the  parties'
respective  rights and obligations with respect to this Agreement and the events
giving rise thereto will be solely as set forth in this Agreement and such other
agreements,  instruments and other documents. WITHOUT LIMITING THE GENERALITY OF
THE FOREGOING, EACH PARTY HERETO AGREES THAT, EXCEPT FOR THE REPRESENTATIONS AND
WARRANTIES  CONTAINED IN THIS AGREEMENT AND, IN THE CASE OF THE NOTE PURCHASERS,
THE  PLEDGE  AGREEMENT,  NONE OF THE  PARTIES  MAKES ON BEHALF OF ITSELF AND ITS
DIRECTORS, OFFICERS,  STOCKHOLDERS,  PARTNERS, TRUSTEES, BENEFICIARIES AND OTHER
AFFILIATES ANY OTHER REPRESENTATIONS OR WARRANTIES, AND EACH HEREBY DISCLAIMS ON
BEHALF OF ITSELF AND ITS OFFICERS, DIRECTORS, STOCKHOLDERS,  PARTNERS, TRUSTEES,
BENEFICIARIES AND OTHER AFFILIATES ANY OTHER  REPRESENTATIONS OR WARRANTIES MADE
BY ITSELF OR ANY OF ITS OFFICERS, DIRECTORS,  STOCKHOLDERS,  PARTNERS, TRUSTEES,
BENEFICIARIES,   EMPLOYEES,  AGENTS,  FINANCIAL  AND  LEGAL  ADVISORS  OR  OTHER
REPRESENTATIVES, WITH RESPECT TO THE EXECUTION AND DELIVERY OF THIS AGREEMENT OR
THE TRANSACTIONS CONTEMPLATED HEREBY, NOTWITHSTANDING THE DELIVERY OR DISCLOSURE
TO THE  OTHER  OR THE  OTHER'S  REPRESENTATIVES  OF ANY  DOCUMENTATION  OR OTHER
INFORMATION WITH RESPECT TO ANY ONE OR MORE OF THE FOREGOING.

         (n) Assignment. This Agreement shall not be assignable by any party and
any such  assignment  shall be null and void,  except that it shall inure to the
benefit of and be binding upon any  successor to each party by operation of law,
including by way of merger, consolidation or sale of all or substantially all of
its assets,  and, in the case of the  Purchasers,  their  respective  executors,
trustees,  and heirs,  and any person to whom any of them shall have transferred
any of the  Subject  Shares or the  Exchanged  Shares not in  violation  of this
Agreement. Notwithstanding the foregoing, ATS may assign its rights and remedies
hereunder to any bank or other financial  institution  which has loaned funds or
otherwise extended credit to it.

         (o) Parties in Interest. This Agreement shall be binding upon and inure
solely to the benefit of the parties and their permitted successors and assigns,
and  nothing in this  Agreement,  express or  implied,  is  intended to or shall
confer  upon any person any  right,  benefit or remedy of any nature  whatsoever
under or by reason of this  Agreement,  except as otherwise  provided in Section
6(n).

         (p) Certain  Definitions.  Terms  defined in the singular  shall have a
comparable meaning when used in the plural, and vice versa, and the reference to
any gender  shall be deemed to include  all  genders.  References  to  "hereof,"
"herein" or similar  terms are intended to refer to the Agreement as a whole and
not

                                      -11-


<PAGE>



a particular section,  and references to "this Section" are intended to refer to
the entire section or article and not a particular subsection thereof.

         (q) Mutual Drafting.  This Agreement is the result of the joint efforts
of ATS and the  Purchasers,  and each  provision  hereof has been subject to the
mutual consultation, negotiation and agreement of the parties and there shall be
no  construction  against either party based on any  presumption of that party's
involvement  in the  drafting  thereof.  Each of the parties is a  sophisticated
legal entity or individual  that was advised by experienced  counsel and, to the
extent it deemed necessary, other advisors in connection with this Agreement.


                     SIGNATURES APPEAR ON THE FOLLOWING PAGE


                                      -12-


<PAGE>




         IN  WITNESS  WHEREOF,  each  of the  parties  hereto  had  caused  this
Agreement to be duly  executed and  delivered as of the day and year first above
written.


                                 American Tower Systems Corporation


                                 By: ________________________________
                                 Name:
                                 Title:


                                 ------------------------------------
                                 Alan L. Box


                                 ------------------------------------
                                 Charlton H. Buckley

                                 Chase Equity Associates, L.P.
                                 By Chase Capital Partners, General Partner


                                 ------------------------------------
                                 Name:
                                 Title:


                                 ------------------------------------
                                 Steven B. Dodge


                                 ------------------------------------
                                 James S. Eisenstein


                                 ------------------------------------
                                 Arthur C. Kellar


                                 ------------------------------------
                                 Steven J. Moskowitz


                                 -------------------------------------
                                 Katharine E. Stoner




                                      -13-


<PAGE>


                                 -------------------------------------
                                 Ruth Rochelle Stoner


                                 -------------------------------------
                                 Theodore A. Stoner


                                 ------------------------------------
                                 Thomas H. Stoner

                                 Thomas H. Stoner and Bessemer Trust Company,
                                 Trustees of Ruth H. Spencer Irrevocable Trust


                                 By:__________________________________
                                       Name:
                                       Title:

                                 Bessemer Trust Company, Trustee of
                                 Thomas H. Stoner Irrevocable Trust

                                 By:__________________________________
                                       Name:
                                       Title:

                                 Thomas and Katharine Stoner Foundation


                                 By:__________________________________
                                       Name:
                                       Title:


                                 -------------------------------------
                                 Thomas Stoner, Jr.

                                 Bessemer Trust Company, Trustee of
                                 Alden Elizabeth Stoner 35 Trust


                                 By:__________________________________
                                       Name:
                                       Title:


                                      -14-


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