WINSTAR COMMUNICATIONS INC
S-3/A, 1999-02-01
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>

   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 1, 1999
    
   
                                                      REGISTRATION NO. 333-70263
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                            ------------------------
 
   
                                AMENDMENT NO. 2
                                       TO
                                    FORM S-3
    
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

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

                          WINSTAR COMMUNICATIONS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                       <C>                                       <C>
                DELAWARE                                    4812                                   13-3585278
      (STATE OR OTHER JURISDICTION              (PRIMARY STANDARD INDUSTRIAL                    (I.R.S. EMPLOYER
           OF INCORPORATION)                    CLASSIFICATION CODE NUMBER)                   IDENTIFICATION NO.)
</TABLE>
 
                            ------------------------

                                230 PARK AVENUE
                            NEW YORK, NEW YORK 10169
                                 (212) 584-4000
              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

                            ------------------------
 
                               TIMOTHY R. GRAHAM
                  EXECUTIVE VICE PRESIDENT AND GENERAL COUNSEL
                                230 PARK AVENUE
                            NEW YORK, NEW YORK 10169
                                 (212) 584-4000
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)

                            ------------------------
 
                                With copies to:
 
<TABLE>
<S>                                       <C>
        DAVID ALAN MILLER, ESQ.                                 STEPHEN L. BURNS, ESQ.
        GRAUBARD MOLLEN & MILLER                               CRAVATH, SWAINE & MOORE
            600 THIRD AVENUE                                      825 EIGHTH AVENUE
        NEW YORK, NEW YORK 10016                               NEW YORK, NEW YORK 10019
             (212) 818-8800                                         (212) 474-1000
</TABLE>
 
                            ------------------------
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  / /
 
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. / /
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / /
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /
 
     If delivery of the Prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT THAT SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

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

<PAGE>
                                EXPLANATORY NOTE
 
   
     This Amendment No. 2 to this Registration Statement is filed for the
purpose of filing exhibits that have not been previously filed with this
Registration Statement.
    

<PAGE>

    
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER     DESCRIPTION
- ----------   -----------
<C>          <S>
    1.1      Form of U.S. Underwriting Agreement*
    1.2      Form of International Underwriting Agreement*
    5        Opinion of Graubard Mollen & Miller**
   23.1      Consent of Grant Thornton LLP**
   23.2      Consent of Grant Thornton LLP**
   23.3      Consent of Ernst & Young LLP**
   23.4      Consent of Graubard Mollen & Miller (included in Exhibit 5)**
   24        Power of Attorney**
</TABLE>
 
- ------------------
 * Filed herewith.
** Previously filed.

    
    
                                      II-1

<PAGE>
                                   SIGNATURES
 

    
   
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL OF THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED, IN THE CITY OF NEW YORK, STATE OF NEW YORK, ON FEBRUARY 1, 1999.
    
 
                                          WINSTAR COMMUNICATIONS, INC.
 
                                          By:        /s/ TIMOTHY R. GRAHAM
                                              ---------------------------------
                                                     Timothy R. Graham
                                                 Executive Vice President,
                                                General Counsel and Director
 
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED,
THIS REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED.
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                       TITLE                              DATE
- ------------------------------------------  ----------------------------------------------   -----------------
<C>                                         <S>                                              <C>
                              *             Chairman of the Board and Chief Executive         February 1, 1999
- ------------------------------------------  Officer
         William J. Rouhana, Jr.

                              *             President, Chief Operating Officer and            February 1, 1999
- ------------------------------------------  Director
              Nathan Kantor

               /s/ TIMOTHY R. GRAHAM        Executive Vice President, General Counsel and     February 1, 1999
- ------------------------------------------  Director
            Timothy R. Graham

                              *             Executive Vice President and                      February 1, 1999
- ------------------------------------------  Chief Financial Officer
            Charles T. Dickson

                              *             Director                                          February 1, 1999
- ------------------------------------------
              Bert Wasserman

                              *             Director                                          February 1, 1999
- ------------------------------------------
         William J. vanden Heuvel

                              *             Director                                          February 1, 1999
- ------------------------------------------
             Steven B. Magyar

                              *             Director                                          February 1, 1999
- ------------------------------------------
              James I. Cash

                              *             Vice President, Finance and                       February 1, 1999
- ------------------------------------------  Principal Accounting Officer
             Joseph P. Dwyer
        *by: /s/ TIMOTHY R. GRAHAM                                                            February 1, 1999
            Timothy R. Graham
           as Attorney in Fact
</TABLE>
    
 
                                      II-2


<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER     DESCRIPTION
- ----------   -----------
<S>          <C>
    1.1      Form of U.S. Underwriting Agreement*
    1.2      Form of International Underwriting Agreement*
    5        Opinion of Graubard Mollen & Miller**
   23.1      Consent of Grant Thornton LLP**
   23.2      Consent of Grant Thornton LLP**
   23.3      Consent of Ernst & Young LLP**
   23.4      Consent of Graubard Mollen & Miller (included in Exhibit 5**)
   24        Power of Attorney**
</TABLE>
    
 
- ------------------

    
 * Filed herewith.
    

** Previously filed.



<PAGE>


                                3,360,000 Shares

                          WINSTAR COMMUNICATIONS, INC.

                         Common Stock ($0.01 par value)

                          U.S. UNDERWRITING AGREEMENT

                                                               January [o], 1999

SALOMON SMITH BARNEY INC.
CREDIT SUISSE FIRST BOSTON CORPORATION
As Representatives of the Several Underwriters
   c/o Salomon Smith Barney Inc.
   388 Greenwich Street
   New York, NY 10013

Ladies and Gentlemen:

         1. Introductory. WinStar Communications, Inc., a Delaware corporation
(the "Issuer" or "WinStar"), and WinStar Multichannel Corp., a Delaware
corporation and a wholly-owned subsidiary of the Issuer ("WMC", and, together
with the Issuer, the "Sellers"), have agreed, subject to the terms and
conditions stated herein, to issue and sell (the "U.S. Offering") to the
several underwriters named in Schedule A hereto (the "Underwriters") an
aggregate of 3,360,000 shares (the "Firm Securities") of the Issuer's Common
Stock, $0.01 par value per share ("Common Stock"). The Issuer also proposes to
grant to the Underwriters an option, exercisable by Salomon Smith Barney Inc.
("Salomon"), to purchase an aggregate of not more than 630,000 additional
shares (the "Optional Securities"). The Firm Securities and the Optional
Securities are herein collectively called the "U.S. Offered Securities". The
United States Securities Act of 1933 is herein referred to as the "Securities
Act".

         It is understood that the Issuer is concurrently entering into an
International Underwriting Agreement, dated the date hereof (the "International
Underwriting Agreement"), with Salomon Brothers International Limited ("Salomon
International") and the other international underwriters named therein
(together with Salomon International, the "International Underwriters"),
relating to the concurrent offering and sale of 840,000 


<PAGE>


shares (the "International Securities") of Common Stock outside the United
States and Canada (the "International Offering"). The U.S. Offered Securities
and the International Securities are collectively referred to as the "Offered
Securities". To provide for the coordination of their activities, the
Underwriters and the International Underwriters have entered into an Agreement
Between U.S. Underwriters and International Underwriters which permit them,
among other things, to sell the Offered Securities to each other for purposes
of resale.

         The Sellers hereby agree with the several Underwriters as follows:
         2. Representations and Warranties of the Sellers. (a) The Sellers
represent and warrant to, and agree with, the several Underwriters that:


<PAGE>
                                                                              3



                  (i) A registration statement on Form S-3 (No. 333-70263)
         relating to the Offered Securities, including a form of prospectus
         relating to the U.S. Offered Securities and a form of prospectus
         relating to the International Securities, has been filed with the
         Securities and Exchange Commission (the "Commission") and either (A)
         has been declared effective under the Securities Act and is not
         proposed to be amended or (B) is proposed to be amended by amendment
         or post-effective amendment. If such registration statement ("Initial
         Registration Statement") has been declared effective, either (A) an
         additional registration statement ("Additional Registration
         Statement") relating to the Offered Securities may have been filed
         with the Commission pursuant to Rule 462(b) ("Rule 462(b)") under the
         Securities Act and, if so filed, has become effective upon filing
         pursuant to such Rule and the Offered Securities all have been duly
         registered under the Securities Act pursuant to the Initial
         Registration Statement and, if applicable, the Additional Registration
         Statement or (B) such an Additional Registration Statement is proposed
         to be filed with the Commission pursuant to Rule 462(b) and will
         become effective upon filing pursuant to such Rule and upon such
         filing the Offered Securities will all have been duly registered under
         the Securities Act pursuant to the Initial Registration Statement and
         such Additional Registration Statement. If the Issuer does not propose
         to amend the Initial Registration Statement or if an Additional
         Registration Statement has been filed and the Issuer does not propose
         to amend it, and if any post-effective amendment to either such
         registration statement has been filed with the Commission prior to the
         execution and delivery of this Agreement, the most recent amendment
         (if any) to each such registration statement has been declared
         effective by the Commission or has become effective upon filing
         pursuant to Rule 462(c) ("Rule 462(c)") under the Securities Act or,
         in the case of the Additional Registration Statement, Rule 462(b). For
         purposes of this Agreement, "Effective Time" with respect to the
         Initial Registration Statement or, if filed prior to the execution and
         delivery of this Agreement, the Additional Registration Statement
         means (A) if the Issuer has advised Salomon and Credit Suisse First
         Boston Corporation (collectively, the "Representatives") that it does
         not propose to amend such registration statement, the date and time as
         of which such registration statement, or the most recent
         post-effective amendment thereto (if any) filed prior to the execution
         and delivery of this Agreement, was declared effective by the
         Commission or has become effective upon filing pursuant to Rule
         462(c), or (B) if the Issuer has advised the Representatives that it
         proposes to file an amendment or post-effective amendment to such
         registration statement, the date and time as of which such
         registration statement, as amended by such amendment or post-effective
         amendment, as the case may be, is declared effective by the
         Commission. If an Additional Registration Statement has not been filed
         prior to the execution and delivery of this Agreement but the Issuer
         has advised the Representatives that it proposes to file one,
         "Effective Time" with respect to such Additional Registration
         Statement means the date and time as of which such registration
         statement is filed 


<PAGE>
                                                                              4



         and becomes effective pursuant to Rule 462(b). "Effective Date" with
         respect to the Initial Registration Statement or the Additional
         Registration Statement (if any) means the date of the Effective Time
         thereof. The Initial Registration Statement, as amended at its
         Effective Time, including (A) all information contained in the
         Additional Registration Statement (if any) and deemed to be a part of
         the Initial Registration Statement as of the Effective Time of the
         Additional Registration Statement pursuant to the General Instructions
         of the Form on which it is filed, (B) all information (if any) deemed
         to be a part of the Initial Registration Statement as of its Effective
         Time pursuant to Rule 430A(b) ("Rule 430A(b)") under the Securities
         Act and (C) all other material incorporated by reference therein, is
         hereinafter referred to as the "Initial Registration Statement". The
         Additional Registration Statement, as amended at its Effective Time,
         including (A) the contents of the Initial Registration Statement
         incorporated by reference therein, (B) all information (if any) deemed
         to be a part of the Additional Registration Statement as of its
         Effective Time pursuant to Rule 430A(b) and (C) all other material
         incorporated by reference therein, is hereinafter referred to as the
         "Additional Registration Statement". The Initial Registration
         Statement and the Additional Registration Statement are hereinafter
         referred to collectively as the "Registration Statements" and
         individually as a "Registration Statement". The form of prospectus
         relating to the U.S. Offered Securities and the form of Prospectus
         relating to the International Securities, each of which shall be
         deemed to include all material incorporated by reference therein and
         as first filed with the Commission pursuant to and in accordance with
         Rule 424(b) ("Rule 424(b)") under the Securities Act or (if no such
         filing is required) as included in a Registration Statement, are
         hereinafter referred to as the "U.S. Prospectus " and the
         "International Prospectus ", respectively, and collectively as the
         "Prospectuses". No document has been or will be prepared or
         distributed in reliance on Rule 434 under the Securities Act.

                  (ii) If the Effective Time of the Initial Registration
         Statement is prior to the execution and delivery of this Agreement:
         (A) on the Effective Date of the Initial Registration Statement, the
         Initial Registration Statement conformed in all respects to the
         requirements of the Securities Act and the rules and regulations of
         the Commission ("Rules and Regulations") and did not include any
         untrue statement of a material fact or omit to state any material fact
         required to be stated therein or necessary to make the statements
         therein not misleading, (B) on the Effective Date of the Additional
         Registration Statement (if any), each Registration Statement
         conformed, or will conform, in all respects to the requirements of the
         Securities Act and the Rules and Regulations and did not include, or
         will not include, any untrue statement of a material fact and did not
         omit, or will not omit, to state any material fact required to be
         stated therein or necessary to make the statements therein not
         misleading and (C) on the date of this Agreement, the Initial
         Registration Statement and, if the Effective Time of the Additional


<PAGE>
                                                                              5



         Registration Statement is prior to the execution and delivery of this
         Agreement, the Additional Registration Statement each conforms, and at
         the time of filing of each of the Prospectuses pursuant to Rule 424(b)
         or (if no such filing is required) at the Effective Date of the
         Additional Registration Statement in which the Prospectuses are
         included, each Registration Statement and each of the Prospectuses
         will conform in all respects to the requirements of the Securities Act
         and the Rules and Regulations, and none of such documents includes, or
         will include, any untrue statement of a material fact or omits, or
         will omit, to state any material fact required to be stated therein or
         necessary to make the statements therein not misleading. If the
         Effective Time of the Initial Registration Statement is subsequent to
         the execution and delivery of this Agreement: on the Effective Date of
         the Initial Registration Statement, the Initial Registration Statement
         and each of the Prospectuses will conform in all respects to the
         requirements of the Securities Act and the Rules and Regulations, none
         of such documents will include any untrue statement of a material fact
         or will omit to state any material fact required to be stated therein
         or necessary to make the statements therein not misleading, and no
         Additional Registration Statement has been or will be filed. The two
         preceding sentences do not apply to statements in or omissions from a
         Registration Statement or either of the Prospectuses based upon
         written information furnished to the Issuer by any Underwriter through
         the Representatives or by any International Underwriter through
         Salomon International specifically for use therein, it being
         understood and agreed that the only such information is that described
         as such in Section 7(c) hereof. The Issuer's Annual Report on Form
         10-K most recently filed with the Commission and all subsequent
         reports (collectively, the "Exchange Act Reports") which have been
         filed by WinStar with the Commission or sent to stockholders pursuant
         to the Securities Exchange Act of 1934 (the "Exchange Act"), when they
         were filed with the Commission, conformed in all material respects to
         the requirements of the Exchange Act and the Rules and Regulations of
         the Commission thereunder.

                  (iii) The Issuer has been duly incorporated and is an
         existing corporation in good standing under the laws of the State of
         Delaware, with corporate power and authority to own its properties and
         conduct its business as described in each of the Prospectuses; and the
         Issuer is duly qualified to do business as a foreign corporation in
         good standing in all other jurisdictions in which its ownership or
         lease of property or the conduct of its business requires such
         qualification, except to the extent that the failure to be so
         qualified or be in good standing would not have a material adverse
         effect on the condition (financial or other), business, properties or
         results of operations of the Issuer and its subsidiaries, taken as a
         whole (a "Material Adverse Effect"). The Issuer is qualified to do
         business as a foreign corporation in the State of New York.


<PAGE>
                                                                              6


                  (iv) Each subsidiary of the Issuer (including WMC) has been
         duly incorporated and is an existing corporation in good standing
         under the laws of the jurisdiction of its incorporation, with
         corporate power and authority to own its properties and conduct its
         business as described in each of the Prospectuses; and each subsidiary
         of the Issuer (including WMC) is duly qualified to do business as a
         foreign corporation in good standing in all other jurisdictions in
         which its ownership or lease of property or the conduct of its
         business requires such qualification, except to the extent that the
         failure to be so qualified or be in good standing would not have a
         Material Adverse Effect; all of the issued and outstanding capital
         stock of each subsidiary of the Issuer (including WMC) has been duly
         authorized and validly issued and is fully paid and nonassessable; and
         the capital stock of each subsidiary owned by the Issuer (including
         WMC), directly or through subsidiaries, is owned free from liens,
         encumbrances and defects.

                  (v) The Offered Securities and all other outstanding shares
         of capital stock of the Issuer have been duly authorized; all
         outstanding shares of capital stock of the Issuer are, and, when the
         Offered Securities have been delivered and paid for in accordance with
         this Agreement and the International Underwriting Agreement on each
         Closing Date (as defined below), such Offered Securities will have
         been validly issued, fully paid and nonassessable and will conform in
         all material respects to the description thereof contained in the
         Prospectuses; and the stockholders of the Issuer have no preemptive
         rights with respect to the Offered Securities.

                  (vi) Except as contemplated by this Agreement or as disclosed
         in the Prospectuses, there are no contracts, agreements or
         understandings between either of the Sellers and any person that would
         give rise to a valid claim against either of the Sellers or any
         Underwriter for a brokerage commission, finder's fee or other like
         payment in connection with the transactions contemplated by this
         Agreement.

                  (vii) Except as disclosed in the Prospectuses or in the
         schedule previously provided to you, there are no contracts,
         agreements or understandings between the Issuer and any person
         granting such person the right to require the Issuer to file a
         registration statement under the Securities Act with respect to any
         securities of the Issuer owned or to be owned by such person or to
         require the Issuer to include such securities in the securities
         registered pursuant to a Registration Statement or in any securities
         being registered pursuant to any other registration statement filed by
         the Issuer under the Securities Act.

                  (viii) The Offered Securities have been approved for listing
         on The Nasdaq National Market.


<PAGE>
                                                                              7


                  (ix) No consent, approval, authorization, or order of, or
         filing with, any governmental agency or body or any court is required
         for the consummation of the transactions contemplated by this
         Agreement or the International Underwriting Agreement in connection
         with the issuance and sale of the Offered Securities by the Sellers,
         other than as may be required under the Securities Act and the Rules
         and Regulations of the Commission thereunder and such as may be
         required by securities or blue sky laws of any state of the United
         States or of any foreign jurisdiction in connection with the offer and
         sale of the Offered Securities.

                  (x) The execution, delivery and performance of this Agreement
         and the International Underwriting Agreement, and the issuance and
         sale of the Offered Securities will not result in a breach or
         violation of any of the terms and provisions of, or constitute a
         default under, (A) any statute, rule, regulation or order of any
         governmental agency or body or any court, domestic or foreign, having
         jurisdiction over the Sellers or any subsidiary of the Issuer or any
         of their properties, (B) any agreement or instrument to which either
         of the Sellers or any such subsidiary is a party or by which either of
         the Sellers or any such subsidiary is bound or to which any of the
         properties of the Sellers or any such subsidiary is subject, or (C)
         the charter or by-laws of either of the Sellers or any such
         subsidiary, except, in the case of clause (A) or (B), such breaches,
         violations or defaults that individually or in the aggregate would not
         have a Material Adverse Effect; and the Issuer has full corporate
         power and authority to authorize, issue and sell the Offered
         Securities to be sold by the Sellers as contemplated by this Agreement
         and the International Underwriting Agreement.

                  (xi) This Agreement has been duly authorized, executed and
         delivered by each of the Sellers and the International Underwriting
         Agreement has been duly authorized, executed and delivered by the
         Issuer.

                  (xii) Except as disclosed in the Prospectuses, the Issuer and
         its subsidiaries have good and marketable title to all real properties
         and all other properties and assets owned by them, in each case free
         from liens, encumbrances and defects that would materially affect the
         value thereof or materially interfere with the use made or to be made
         thereof by them; and, except as disclosed in the Prospectuses, the
         Issuer and its subsidiaries hold any leased real or personal property
         under valid and enforceable leases with no exceptions that would
         materially interfere with the use made or to be made thereof by them.

                  (xiii) The Issuer and its subsidiaries possess adequate
         certificates, authorities or permits issued by appropriate
         governmental agencies or bodies necessary to conduct the business now
         operated by them and have not received any notice of proceedings
         relating to the revocation or modification of any such certificate,
         authority or permit that, individually or in the aggregate, could
         reasonably be expected to have a Material Adverse Effect.


<PAGE>
                                                                              8


                  (xiv) No labor dispute with the employees of the Issuer or
         any of its subsidiaries exists or, to the knowledge of the Issuer, is
         imminent that could reasonably be expected to have a Material Adverse
         Effect.

                  (xv) The Issuer and its subsidiaries own, possess or can
         acquire on reasonable terms, adequate trademarks, trade names and
         other rights to inventions, know-how, patents, copyrights,
         confidential information and other intellectual property
         (collectively, "intellectual property rights") necessary to conduct
         the business as now operated by them, or used in the conduct of the
         business as now operated by them, except to the extent that the
         failure to own or possess or the inability to acquire such
         intellectual property rights would not individually or in the
         aggregate have a Material Adverse Effect; and the Issuer has not
         received any notice of infringement of or conflict with asserted
         rights of others with respect to any intellectual property rights
         that, if determined adversely to the Issuer or any of its
         subsidiaries, would individually or in the aggregate have a Material
         Adverse Effect.

                  (xvi) Except as disclosed in the Prospectuses, neither the
         Issuer nor any of its subsidiaries is in violation of any statute,
         rule, regulation, decision or order of any governmental agency or body
         or any court, domestic or foreign, relating to the use, disposal or
         release of hazardous or toxic substances or relating to the protection
         or restoration of the environment or human exposure to hazardous or
         toxic substances (collectively, "environmental laws"), owns or
         operates any real property contaminated with any substance that is
         subject to any environmental laws, is liable for any off-site disposal
         or contamination pursuant to any environmental laws, or is subject to
         any claim relating to any environmental laws, which violation,
         contamination, liability or claim would individually or in the
         aggregate have a Material Adverse Effect; and the Issuer is not aware
         of any pending investigation which might lead to such a claim.

                  (xvii) Except as disclosed in the Prospectuses, there are no
         pending actions, suits or proceedings against or affecting the Issuer,
         any of its subsidiaries or any of their respective properties that,
         individually or in the aggregate, could reasonably be expected to have
         a Material Adverse Effect, or to materially and adversely affect the
         ability of the Issuer to perform its obligations under this Agreement
         or the International Underwriting Agreement, or which are otherwise
         material in the context of the sale of the Offered Securities; and, to
         the Issuer's knowledge, no such actions, suits or proceedings are
         threatened or contemplated.

                  (xviii) The financial statements included in each
         Registration Statement and the Prospectuses present fairly the
         financial position of the Issuer and its consolidated subsidiaries as
         of the dates shown and their results of operations and 


<PAGE>
                                                                              9


         cash flows for the periods shown, such financial statements have been
         prepared in conformity with the generally accepted accounting
         principles in the United States applied on a consistent basis, the
         schedules included in each Registration Statement present fairly the
         information required to be stated therein, the assumptions used in
         preparing the pro forma financial statements included in each
         Registration Statement and the Prospectuses provide a reasonable basis
         for presenting the significant effects directly attributable to the
         transactions or events described therein, the related pro forma
         adjustments give appropriate effect to those assumptions, and the pro
         forma columns therein reflect the proper application of those
         adjustments to the corresponding historical financial statement
         amounts.

                  (xix) Except as disclosed in the Prospectuses, since the date
         of the latest audited financial statements included in the
         Prospectuses, there has been no material adverse change, nor any
         development or event involving a prospective material adverse change,
         in the condition (financial or other), business, properties or results
         of operations of the Issuer and its subsidiaries taken as a whole (it
         being understood that a change in the price of the Common Stock or the
         continuation of operating losses consistent with the Issuer's
         historical results shall be deemed not to be, in and of themselves,
         such a material adverse change), and, except as disclosed in or
         contemplated by the Prospectuses, there has been no dividend or
         distribution of any kind declared, paid or made by the Issuer on any
         class of its capital stock.

                  (xx) Neither of the Sellers is an open-end investment
         company, unit investment trust or face-amount certificate company that
         is or is required to be registered under Section 8 of the United
         States Investment Company Act of 1940 (the "Investment Company Act");
         neither of the Sellers is a closed-end investment company required to
         be registered, but not registered, thereunder; and neither of the
         Sellers is and, after giving effect to the offering and sale of the
         Offered Securities and the application of the proceeds thereof as
         described in the Prospectuses, nor will be an "investment company" as
         defined in the Investment Company Act.

                  (xxi) WMC has, and on each Closing Date hereinafter mentioned
         will have, valid unencumbered title to the Offered Securities to be
         sold by WMC on such date and the legal right and power, and all
         authorization and approval required by law, to enter into this
         Agreement and to sell, assign, transfer and deliver the Offered
         Securities to be sold by WMC.

                  (xxii) Upon delivery of the Offered Securities to be sold by
         WMC pursuant to this Agreement and payment therefor as contemplated by
         this Agreement, marketable title to the Offered Securities will pass
         to the Underwriters 


<PAGE>
                                                                             10


         free and clear of any security interests, claims, liens, equities and
         other encumbrances, other than security interests, liens, equities or
         other encumbrances arising solely from the actions of the
         Underwriters.

                  (xxiii) There are no material agreements or arrangements
         relating to the Issuer or its subsidiaries to which WMC, or to the
         best of WMC's knowledge, to which any direct or indirect stockholder
         of WMC is a party, which are required to be described in the
         Registration Statements or the Prospectus or to be filed as exhibits
         thereto that are not so described or filed.

                  (xxiv) The Issuer is subject to Section 13 or 15(d) of the
         Exchange Act.

                  (xxv) The Issuer and its subsidiaries are in compliance in
         all material respects with the Communications Act of 1934 (as amended
         by the Telecommunications Act of 1996, the "Communications Act") and
         with all applicable rules, regulations and policies of the Federal
         Communications Commission (the "FCC").

                  (xxvi) The Issuer has provided to the Underwriters a complete
         and accurate list of all licenses granted to the Issuer and its
         subsidiaries [(other than experimental licenses in the 38 GHz portions
         of the radio spectrum and licenses granted to the Issuer or its
         subsidiaries or acquired from Local Area Telecommunications, Inc. that
         are not in the 38 GHz portion of the radio spectrum)] by the FCC (the
         "Licenses"). All of the Licenses are currently valid and in full force
         and effect. Neither the Issuer nor any of its subsidiaries has any
         knowledge of any investigation, notice of apparent liability,
         violation, forfeiture or other order or complaint issued by or before
         any court or regulatory body, including the FCC, or of any other
         proceedings (other than proceedings relating to the wireless
         communications industries generally) which could in any manner
         materially threaten or adversely affect the validity or continued
         effectiveness of any of the Licenses, except that (A) on March 9,
         1998, several parties filed petitions for reconsideration (the
         "Petitions") of the 38 GHz Order (as defined in the Prospectuses)
         alleging, among other things, that the February 10, 1998 License
         grants to the Issuer of additional channels in each of Atlanta,
         Buffalo, Cincinnati, Dallas, Houston, Miami, New York, St. Louis,
         Seattle, Spokane and Tampa were in violation of the rules of the FCC
         and (B) on December 31, 1998, two parties filed petitions for
         clarification and reconsideration of two December 1, 1998 License
         correction grants to the Issuer in Atlanta and Dallas alleging that
         such grants were in violation of the rules of the FCC.

                  (xxvii) No event has occurred which (A) results in, or after
         notice or lapse of time or both would result in, revocation,
         suspension, adverse modification, nonrenewal, impairment, restriction
         or termination of, or order of forfeiture with 


<PAGE>
                                                                             11


         respect to, any License or (B) materially and adversely affects or
         could reasonably be expected in the future to materially adversely
         affect any of the rights of the Issuer or any of its subsidiaries
         thereunder.

                  (xxviii) The Issuer and its subsidiaries have duly filed in a
         timely manner all material filings, reports, applications, documents,
         instruments and information required to be filed by them under the
         Communications Act, and all such filings are true, correct and
         complete in all material respects.

                  (xxix) Neither the Issuer nor any of its subsidiaries has any
         reason to believe that any of the Licenses will not be renewed in the
         ordinary course.

         3. Purchase, Sale and Delivery of Offered Securities; Payment of
Underwriting Discount. On the basis of the representations, warranties and
agreements herein contained, but subject to the terms and conditions herein set
forth, each of the Sellers agrees, severally and not jointly, to sell to the
Underwriters, and each Underwriter agrees, severally and not jointly, to
purchase, at a purchase price of U.S. $[ o ] per share: (a) from the Issuer,
that number of Firm Securities (rounded up or down, as determined by Salomon in
its discretion, in order to avoid fractions) obtained by multiplying the number
of Firm Securities set forth opposite the name of the Issuer in Schedule B
hereto by a fraction the numerator of which is the number of Firm Securities
set forth opposite the name of such Underwriter in Schedule A hereto and the
denominator of which is the total number of Firm Securities; and (b) from WMC,
that number of Firm Securities (rounded up or down, as determined by Salomon in
its discretion, in order to avoid fractions) obtained by multiplying the number
of Firm Securities set forth opposite the name of WMC in Schedule B hereto by a
fraction the numerator of which is the number of Firm Securities set forth
opposite the name of such Underwriter in Schedule A hereto and the denominator
of which is the total number of Firm Securities.

         Each of the Sellers will deliver the Firm Securities to the
Representatives for the accounts of the Underwriters, against payment of the
purchase price in Federal (same day) funds by wire transfer to accounts
previously designated to Salomon by the Sellers at one or more financial
institutions acceptable to Salomon at the office of Cravath, Swaine & Moore,
825 Eighth Avenue, New York, New York 10019, at 9:00 A.M., New York time, on
February [ o ], 1999, or at such other time not later than seven full business
days thereafter as Salomon and the Issuer determine, such time being herein
referred to as the "First Closing Date". For purposes of Rule 15c6-1 under the
Securities Exchange Act, the First Closing Date (if later than the otherwise
applicable settlement date) shall be the settlement date for payment of funds
and delivery of securities for all the Offered Securities sold pursuant to the
offering. The certificates for the Firm Securities so to be delivered will be
in definitive form, in such denominations and registered in such names 


<PAGE>
                                                                             12


as Salomon requests and will be made available for checking and packaging at
the above office of Cravath, Swaine & Moore at least 24 hours prior to the
First Closing Date.

         In addition, upon written notice from Salomon given to the Issuer up
to two times and not more than 30 days subsequent to the date of the
Prospectuses, the Underwriters may purchase all or less than all of the
Optional Securities at the purchase price per Security to be paid for the Firm
Securities. The Issuer agrees to sell to the Underwriters the number of
Optional Securities obtained by multiplying the number of Optional Securities
specified in such notice by a fraction the numerator of which is the number of
shares set forth opposite the name of the Issuer in Schedule B hereto under the
caption "Number of Optional Securities to be Sold" and the denominator of which
is the total number of Optional Securities (subject to adjustment by Salomon to
eliminate fractions). Such Optional Securities shall be purchased from the
Issuer for the account of each Underwriter in the same proportion as the number
of Firm Securities set forth opposite such Underwriter's name bears to the
total number of Firm Securities (subject to adjustment by Salomon to eliminate
fractions) and may be purchased by the Underwriters only for the purpose of
covering over-allotments made in connection with the sale of the Firm
Securities. No Optional Securities shall be sold or delivered unless the Firm
Securities previously have been, or simultaneously are, sold and delivered. The
right to purchase the Optional Securities or any portion thereof may be
exercised up to two times and to the extent not previously exercised may be
surrendered and terminated at any time upon notice by Salomon to the Issuer.

         Each time for the delivery of and payment for the Optional Securities,
being herein referred to as an "Optional Closing Date", which may be the First
Closing Date (the First Closing Date and each Optional Closing Date, if any,
being sometimes referred to as a "Closing Date"), shall be determined by
Salomon but shall be not later than five full business days after written
notice of election to purchase Optional Securities is given. The Issuer will
deliver the Optional Securities being purchased on each Optional Closing Date
to the Representatives for the accounts of the several Underwriters, against
payment of the purchase price therefor in Federal (same day) funds by wire
transfer to accounts previously designated to Salomon by the Issuer at one or
more financial institutions acceptable to Salomon at the above office of
Cravath, Swaine & Moore. The certificates for the Optional Securities being
purchased on each Optional Closing Date will be in definitive form, in such
denominations and registered in such names as Salomon requests upon reasonable
notice prior to such Optional Closing Date and will be made available for
checking and packaging at the above office of Cravath, Swaine & Moore at a
reasonable time in advance of such Optional Closing Date.

         4. Representation of Underwriters. The Representatives will act for
the several Underwriters in connection with this financing, and any action
under this Agreement taken by the Representatives jointly or by Salomon will be
binding upon all the Underwriters.


<PAGE>
                                                                             13


         5. Certain Agreements of the Sellers and the Underwriters. The Sellers
and the several Underwriters agree that:

         (a) If the Effective Time of the Initial Registration Statement is
prior to the execution and delivery of this Agreement, the Issuer will file
each of the Prospectuses with the Commission pursuant to and in accordance with
subparagraph (1) (or, if applicable and if consented to by Salomon,
subparagraph (4)) of Rule 424(b) not later than the earlier of (i) the second
business day following the execution and delivery of this Agreement or (ii) the
fifteenth business day after the Effective Date of the Initial Registration
Statement. The Issuer will advise Salomon promptly of any such filing pursuant
to Rule 424(b). If the Effective Time of the Initial Registration Statement is
prior to the execution and delivery of this Agreement and an Additional
Registration Statement is necessary to register a portion of the Offered
Securities under the Securities Act but the Effective Time thereof has not
occurred as of such execution and delivery, the Issuer will file the Additional
Registration Statement or, if filed, will file a post-effective amendment
thereto with the Commission pursuant to and in accordance with Rule 462(b) on
or prior to 10:00 P.M., New York time, on the date of this Agreement or, if
earlier, on or prior to the time either Prospectus is printed and distributed
to any Underwriter, or will make such filing at such later date as shall have
been consented to by Salomon.

         (b) The Issuer will advise Salomon promptly of any proposal to amend
or supplement the Initial Registration Statement, the Additional Registration
Statement (if any) and either the Prospectuses and will not effect such
amendment or supplementation without Salomon's prior consent (which consent
shall not be unreasonably withheld); and the Issuer will also advise Salomon
promptly of the effectiveness of each Registration Statement (if its Effective
Time is subsequent to the execution and delivery of this Agreement) and of any
amendment or supplement to a Registration Statement or either of the
Prospectuses and of the institution by the Commission of any stop order
proceedings in respect of a Registration Statement and will use its best
efforts to prevent the issuance of any such stop order and to obtain as soon as
possible its lifting, if issued.

         (c) If, at any time when a prospectus relating to the Offered
Securities is required to be delivered under the Securities Act in connection
with sales by any Underwriter, International Underwriter or dealer, any event
occurs as a result of which the Prospectus as then amended or supplemented
would include an untrue statement of a material fact or omit to state any
material fact necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading, or if it is necessary
at any time to amend the Prospectus to comply with the Securities Act, the
Issuer will promptly notify Salomon of such event and will promptly prepare and
file with the Commission, at its own expense, an amendment or supplement which
will correct such statement or omission or an amendment which will effect such
compliance. Neither Salomon's 


<PAGE>
                                                                             14


consent to, nor the Underwriters' delivery of, any such amendment or supplement
shall constitute a waiver of any of the conditions set forth in Section 6.

         (d) As soon as practicable, but not later than the Availability Date
(as defined below), the Issuer will make generally available to its
securityholders an earnings statement covering a period of at least 12 months
beginning after the Effective Date of the Initial Registration Statement (or,
if later, the Effective Date of the Additional Registration Statement) which
will satisfy the provisions of Section 11(a) of the Securities Act. For the
purpose of the preceding sentence, "Availability Date" means the 45th day after
the end of the fourth fiscal quarter following the fiscal quarter that includes
such Effective Date, except that, if such fourth fiscal quarter is the last
quarter of the Issuer's fiscal year, "Availability Date" means the 90th day
after the end of such fourth fiscal quarter.

         (e) The Issuer will furnish to the Representatives copies of each
Registration Statement (five of which will be signed and will include all
exhibits), each related preliminary prospectus, and, so long as a prospectus
relating to the Offered Securities is required to be delivered under the
Securities Act in connection with sales by any Underwriter or dealer, the U.S.
Prospectus and all amendments and supplements to such documents, in each case
in such quantities as Salomon reasonably requests. The U.S. Prospectus shall be
so furnished on or prior to 3:00 P.M., New York time, on the business day
following the later of the execution and delivery of this Agreement or the
Effective Time of the Initial Registration Statement. All other documents shall
be so furnished as soon as available. The Issuer will pay the expenses of
printing and distributing to the Underwriters all such documents.

         (f) The Issuer will use its best efforts to arrange for the
qualification of the Offered Securities for sale and the determination of their
eligibility for investment under the laws of such jurisdictions in the United
States and Canada as Salomon reasonably designates and will continue such
qualifications in effect so long as required for the resale of the Offered
Securities by the Underwriters; provided, however, that the Issuer will not be
required to qualify as a foreign corporation or to file a general consent to
service of process in any such jurisdiction.

         (g) During the period of five years after the Closing Date, the Issuer
will furnish to the Representatives and, upon request, to each of the other
Underwriters, as soon as practicable after the end of each fiscal year, a copy
of the Issuer's annual report to stockholders for such year; and the Issuer
will furnish to the Representatives and, upon request, to each of the other
Underwriters (i) as soon as available, a copy of each report and any definitive
proxy statement of the Issuer filed with the Commission under the Exchange Act
or mailed to stockholders and (ii) from time to time, such other publicly
available information concerning the Issuer as Salomon may reasonably request.


<PAGE>
                                                                             15


         (h) The Issuer will pay all expenses incident to the performance of
its obligations and the obligations of WMC under this Agreement, for any filing
fees and other expenses (including fees and disbursements of counsel) incurred
in connection with qualification of the Offered Securities for sale under the
laws of such jurisdictions as Salomon designates and the printing of memoranda
relating thereto, for any travel expenses of the Issuer's officers and
employees and any other expenses of the Issuer approved in advance by the
Issuer in connection with attending or hosting meetings with prospective
purchasers of the Offered Securities, for any transfer taxes on the sale of the
Offered Securities and for expenses incurred in distributing preliminary
prospectuses and the Prospectuses (including any amendments and supplements
thereto) to the Underwriters.

         (i) The Issuer agrees that no Common Stock other than the Offered
Securities will be included for sale in the Registration Statement.

         (j) For a period of 90 days after the date hereof (the "Applicable
Period"), the Issuer and its executive officers and directors will not sell
(except that the executive officers and directors may, with the consent of the
Underwriters (which consent shall not be unreasonably withheld), sell
securities out of their customary margin accounts), contract to sell, pledge or
otherwise dispose of, directly or indirectly, or (except pursuant to agreements
executed on or prior to the date hereof) arrange to have declared effective
during the Applicable Period a registration statement under the Securities Act
covering the sale by the Issuer or its executive officers and directors of (i)
any shares of Common Stock of the Issuer or any other capital stock of the
Issuer or (ii) any other securities which are convertible into, or exercisable
or exchangeable for, Common Stock or other capital stock of the Issuer
(collectively, "Derivative Securities"), without the prior written consent of
Salomon, which shall not be unreasonably withheld, except (A) with respect to
the Issuer (1) Common Stock or preferred stock issued or delivered as payment
of dividends on, or upon conversion, of any preferred stock of the Issuer, (2)
securities issued or delivered upon conversion, exchange or exercise of any
other securities (including notes and debentures) of the Issuer outstanding on
the date of the Prospectuses or which become outstanding after the date hereof
without violating this section 5(j), (3) capital stock, options and other
equity-based awards issued pursuant to benefit or incentive plans maintained
for the officers, directors or employees of, or persons providing services to,
the Issuer or its subsidiaries, or pursuant to the Issuer's dividend
reinvestment, 401(k), stock purchase or similar plans, (4) securities issued in
connection with, or in furtherance of, mergers, acquisitions of assets or
equity of others (including spectrum licenses and application therefor and
interests in entities with spectrum licenses and application therefor) or
similar transactions, (5) securities representing a minority interest in the
Issuer issued to a strategic investor who agrees not to resell such securities
during the Applicable Period or (6) Common Stock, preferred stock, other
capital stock or Derivative Securities in a transaction not registered under
the Securities Act, if the Issuer does not arrange to have a registration
statement covering the resale of any such securities declared effective during
the Applicable Period, and (B) with respect to the Issuer's


<PAGE>
                                                                             16


executive officers and directors, (i) securities transferred by an executive
officer or director in a private transaction where the transferee receiving
such securities agrees to be bound by this section 5(j), (ii) the transfer of
no more than 70,000 securities per each of the four inside directors or (iii)
the transfer of no more than 25,000 securities per each of the four independent
directors.

         (k) Each Underwriter agrees that (i) it is not purchasing any of the
U.S. Offered Securities for the account of anyone other than a U.S. or Canadian
Person, (ii) it has not offered or sold, and will not offer or sell, directly
or indirectly, any of the U.S. Offered Securities or distribute any U.S.
Prospectus to any person outside the United States or Canada, or to anyone
other than a U.S. or Canadian Person and (iii) any dealer to whom it may sell
any of the U.S. Offered Securities will represent that it is not purchasing for
the account of anyone other than a U.S. or Canadian Person and agree that it
will not offer or resell, directly or indirectly, any of the U.S. Offered
Securities outside the United States or Canada, or to anyone other than a U.S.
or Canadian Person or to any other dealer who does not so represent and agree;
provided, however, that the foregoing shall not restrict (A) purchases and
sales between the International Underwriters on the one hand and the
Underwriters on the other hand pursuant to the Agreement Between U.S.
Underwriters and International Underwriters, (B) stabilization transactions
contemplated under the Agreement Between U.S. Underwriters and International
Under writers, conducted through Salomon (or through the Representatives and
Salomon International) as part of the distribution of the Offered Securities
and (C) sales to or through (or distributions of U.S. Prospectuses or the
related preliminary prospectuses to) U.S. or Canadian Persons who are
investment advisors, or who otherwise exercise investment discretion, and who
are purchasing for the account of anyone other than a U.S. or Canadian Person.


<PAGE>
                                                                             17


         6. Conditions of the Obligations of the Underwriters. The obligations
of the several Underwriters to purchase and pay for the Firm Securities on the
First Closing Date and the Optional Securities to be purchased on each Optional
Closing Date will be subject to the accuracy of the representations and
warranties on the part of the Sellers herein, to the accuracy of the
certificates of officers of the Sellers delivered pursuant to the provisions
hereof, to the performance by the Sellers of their obligations hereunder and to
the following additional conditions precedent:

         (a) The Representatives shall have received a letter, dated the date
of delivery thereof (which, if the Effective Time of the Initial Registration
Statement is prior to the execution and delivery of this Agreement, shall be on
or prior to the date of this Agreement or, if the Effective Time of the Initial
Registration Statement is subsequent to the execution and delivery of this
Agreement, shall be prior to the filing of the amendment or post-effective
amendment to the registration statement to be filed shortly prior to such
Effective Time), of Grant Thornton LLP, in agreed form, confirming that they
are independent public accountants within the meaning of the Securities Act and
the applicable published Rules and Regulations thereunder and stating to the
effect that:

                  (i) in their opinion the financial statements and schedules
         examined by them and included in the Registration Statements comply as
         to form in all material respects with the applicable accounting
         requirements of the Securities Act and the related published Rules and
         Regulations;

                  (ii) they have performed the procedures specified by the
         American Institute of Certified Public Accountants for a review of
         interim financial information as described in Statement of Auditing
         Standards No. 71, Interim Financial Information, on the unaudited
         financial statements included in the Registration Statements;

                  (iii) on the basis of the review referred to in clause (ii)
         above, a reading of the latest available interim financial statements
         of the Issuer, inquiries of certain officials of the Issuer who have
         responsibility for financial and accounting matters and other
         specified procedures, nothing came to their attention that caused them
         to believe that:

                           (A) the unaudited financial statements and schedules
                  included in the Registration Statements do not comply as to
                  form in all material respects with the applicable accounting
                  requirements of the Securities Act and the related published
                  Rules and Regulations or any material modifications should be
                  made to such unaudited financial statements and schedules for
                  them to be in conformity with generally accepted accounting
                  principles;


<PAGE>
                                                                             18


                           (B) at January 27, 1999, there was any change in the
                  capital stock or paid-in capital, increase in long-term debt
                  or any decreases in consolidated net current assets or
                  stockholders' equity of the Issuer and its subsidiaries, on a
                  consolidated basis, as compared with amounts shown on the
                  December 31, 1997 audited consolidated balance sheet included
                  in the Prospectuses; or

                           (C) for the period from October 1, 1998 to January
                  27, 1999, there were any decreases, as compared with the
                  corresponding period in the preceding year, in consolidated
                  operating revenues or in the total or per-share amounts of
                  net loss;

                           (D) the unaudited pro forma condensed consolidated
                  financial statements included in the Prospectuses do not
                  comply as to form in all material respects with the
                  applicable accounting requirements of the Securities Act and
                  the related published Rules and Regulations thereunder or the
                  pro forma adjustments have not been properly applied to the
                  historical amounts in the compilation of those statements.

         except in all cases set forth in clauses (A) and (B) above for
         changes, increases or decreases which the Prospectuses disclose have
         occurred or may occur or which are described in such letter; and

                  (iv) they have compared specified dollar amounts (or
         percentages derived from such dollar amounts) and other financial
         information contained in the Registration Statements (in each case to
         the extent that such dollar amounts, percentages and other financial
         information are derived from the general accounting records of the
         Issuer and its subsidiaries subject to the internal controls of the
         Issuer's accounting system or are derived directly from such records
         by analysis or computation) with the results obtained from inquiries,
         a reading of such general accounting records and other procedures
         specified in such letter and have found such dollar amounts,
         percentages and other financial information to be in agreement with
         such results, except as otherwise specified in such letter.

For purposes of this subsection, (i) if the Effective Time of the Initial
Registration Statement is subsequent to the execution and delivery of this
Agreement, "Registration Statements" shall mean the Initial Registration
Statement as proposed to be amended by the amendment or post-effective
amendment to be filed shortly prior to its Effective Time, (ii) if the
Effective Time of the Initial Registration Statement is prior to the execution
and delivery of this Agreement but the Effective Time of the Additional
Registration Statement is subsequent to such execution and delivery,
"Registration Statements" shall mean the Initial Registration Statement and the
Additional Registration Statement as proposed to be filed or as proposed to be
amended by the post-effective 


<PAGE>
                                                                             19


amendment to be filed shortly prior to its Effective Time and (iii)
"Prospectuses" shall mean the prospectuses included in the Registration
Statements. All financial statements and schedules included in material
incorporated by reference into the Prospectuses shall be deemed included in the
Registration Statements for purposes of this subsection.

         (b) The Representatives shall have received a letter, dated the date
of delivery thereof (which, if the Effective Time of the Initial Registration
Statement is prior to the execution and delivery of this Agreement, shall be on
or prior to the date of this Agreement or, if the Effective Time of the Initial
Registration Statement is subsequent to the execution and delivery of this
Agreement, shall be prior to the filing of the amendment or post-effective
amendment to the registration statement to be filed shortly prior to such
Effective Time), of Ernst & Young LLP with respect to the financial statements
and other financial information of MIDCOM Communications Inc. included in the
Registration Statements, in a form to be agreed upon.

         (c) If the Effective Time of the Initial Registration Statement is not
prior to the execution and delivery of this Agreement, such Effective Time
shall have occurred not later than 10:00 P.M., New York time, on the date of
this Agreement or such later date as shall have been consented to by Salomon.
If the Effective Time of the Additional Registration Statement (if any) is not
prior to the execution and delivery of this Agreement, such Effective Time
shall have occurred not later than 10:00 P.M., New York time, on the date of
this Agreement or, if earlier, the time either Prospectus is printed and
distributed to any Underwriter, or shall have occurred at such later date as
shall have been consented to by Salomon. If the Effective Time of the Initial
Registration Statement is prior to the execution and delivery of this
Agreement, each of the Prospectuses shall have been filed with the Commission
in accordance with the Rules and Regulations and Section 5(a) of this
Agreement. Prior to such Closing Date, no stop order suspending the
effectiveness of a Registration Statement shall have been issued and no
proceedings for that purpose shall have been instituted or, to the knowledge of
the Issuer or the Representatives, shall be contemplated by the Commission.

         (d) Subsequent to the execution and delivery of this Agreement, there
shall not have occurred (i) a change in U.S. or international financial,
political or economic conditions or currency exchange rates or exchange
controls as would, in the reasonable judgment of Salomon, be likely to
prejudice materially the success of the proposed issue, sale or distribution of
the Offered Securities, whether in the primary market or in respect of dealings
in the secondary market, or (ii) (A) any change, or any development or event
involving a prospective change, in the condition (financial or other),
business, properties or results of operations of the Issuer or its subsidiaries
which, in the reasonable judgment of Salomon, is material and adverse and makes
it impractical or inadvisable to proceed with completion of the offering or the
sale of and payment for the Offered Securities; (B) any downgrading in the
rating of any debt securities of the Issuer by any "nationally recognized
statistical rating organization" (as defined for purposes of Rule 436(g) under


<PAGE>
                                                                             20


the Securities Act), or any public announcement that any such organization has
under surveillance or review its rating of any debt securities of the Issuer
(other than an announcement with positive implications of a possible upgrading,
and no implication of a possible downgrading, of such rating); (C) any
suspension or limitation of trading in securities generally on the New York
Stock Exchange, or any setting of minimum prices for trading on such exchange,
or any suspension of trading of any securities of the Issuer on any exchange or
in the over-the-counter market; (D) any banking moratorium declared by U.S.
Federal or New York authorities; or (E) any outbreak or escalation of major
hostilities in which the United States is involved, any declaration of war by
Congress or any other substantial national or international calamity or
emergency if, in the reasonable judgment of Salomon, the effect of any such
outbreak, escalation, declaration, calamity or emergency makes it impractical
or inadvisable to proceed with completion of the offering or sale of and
payment for the Offered Securities.

         (e) The Representatives shall have received an opinion, dated the
Closing Date, of Graubard Mollen & Miller, counsel for the Sellers,
substantially to the effect set forth in (i)-(viii) below, and of Willkie Farr
& Gallagher, regulatory counsel for the Issuer, substantially to the effect set
forth in (vii) and (ix)-(xvi) below, that:

                  (i) Each of the Sellers has been duly incorporated and is an
         existing corporation in good standing under the laws of the State of
         Delaware, with corporate power and authority to own its properties and
         conduct its business as described in the Prospectuses;

                  (ii) The Offered Securities delivered on such Closing Date
         and all other outstanding shares of Common Stock of the Issuer have
         been duly authorized and validly issued, are fully paid and
         nonassessable and conform to the description thereof contained in the
         Prospectuses; and the stockholders of the Issuer have no preemptive
         rights with respect to the Securities;

                  (iii) Each of the Sellers is not and, after giving effect to
         the offering and sale of the Offered Securities and the application of
         the proceeds thereof as described in the Prospectuses, will not be an
         "investment company" as defined in the Investment Company Act;

                  (iv) Except as disclosed in the Prospectuses or in the
         schedule previously provided to you, there are no contracts,
         agreements or understandings known to such counsel between the Issuer
         and any person granting such person the right to require the Issuer to
         file a registration statement under the Securities Act with respect to
         any securities of the Issuer owned or to be owned by such person or to
         require the Issuer to include such securities in the securities
         registered pursuant to the Registration Statement or in any securities
         being registered pursuant to any other registration statement filed by
         the Issuer under the Securities Act;


<PAGE>
                                                                             21


                  (v) No consent, approval, authorization or order of, or
         filing with, any governmental agency or body or any court is required
         for the consummation of the transactions contemplated by this
         Agreement or the International Underwriting Agreement in connection
         with the issuance or sale of the Offered Securities by the Sellers,
         other than as may be required under the Securities Act and the Rules
         and Regulations of the Commission thereunder, and such as may be
         required by securities or blue sky laws of the various states of the
         United States and of foreign jurisdictions in connection with the
         offer and sale of the Offered Securities;

                  (vi) The execution, delivery and performance of this
         Agreement and the International Underwriting Agreement, and the
         issuance and sale of the Offered Securities will not result in a
         breach or violation of any of the terms and provisions of, or
         constitute a default under, (A) any statute, rule or regulation or any
         order known to such counsel of any governmental agency or body or any
         court having jurisdiction over the Sellers or any subsidiary of the
         Issuer or any of its properties, (B) any agreement or instrument
         listed as an exhibit to the Issuer's Annual Report on Form 10-K most
         recently filed with the Commission or listed as an exhibit to or filed
         with any subsequent reports filed by the Issuer under the Exchange Act
         through December 31, 1998, to which either of the Sellers or any such
         subsidiary of the Issuer is a party or by which either of the Sellers
         or any such subsidiary of the Issuer is bound or to which any of the
         properties of the Issuer or any such subsidiary is subject or (C) the
         charter or by-laws of either of the Sellers or any such subsidiary of
         the Issuer, except, in the case of clause (A) or (B), breaches,
         violations or defaults that individually or in the aggregate would not
         have a Material Adverse Effect; and the Issuer has full power and
         corporate authority to authorize, issue and sell the Offered
         Securities to be sold by the Sellers as contemplated by this Agreement
         and the International Underwriting Agreement, respectively;

                  (vii) The Initial Registration Statement was declared
         effective under the Securities Act as of the date and time specified
         in such opinion, the Additional Registration Statement (if any) was
         filed and became effective under the Securities Act as of the date and
         time (if determinable) specified in such opinion, each of the
         Prospectuses either were filed with the Commission pursuant to the
         subparagraph of Rule 424(b) specified in such opinion on the date
         specified therein or were included in the Initial Registration
         Statement or the Additional Registration Statement (as the case may
         be), and, to the best of the knowledge of such counsel, no stop order
         suspending the effectiveness of a Registration Statement or any part
         thereof has been issued and no proceedings for that purpose have been
         instituted or are pending or contemplated under the Securities Act,
         and each Registration Statement and each of the Prospectuses, and each
         amendment or supplement thereto, as of their respective effective or
         issue dates, complied as to form in all material respects with the
         requirements of the Securities Act and the 


<PAGE>
                                                                             22


         Rules and Regulations; such counsel have no reason to believe that any
         part of a Registration Statement or any amendment thereto, as of its
         effective date or as of such Closing Date, contained any untrue
         statement of a material fact or omitted to state any material fact
         required to be stated therein or necessary to make the statements
         therein not misleading or that either of the Prospectuses or any
         amendment or supplement thereto, as of its issue date or as of such
         Closing Date, contained any untrue statement of a material fact or
         omitted to state any material fact necessary in order to make the
         statements therein, in the light of the circumstances under which they
         were made, not misleading; the descriptions in the Registration
         Statements and Prospectuses of statutes, legal and governmental
         proceedings and contracts and other documents are accurate and fairly
         present the information required to be shown; and such counsel do not
         know of any legal or governmental proceedings required to be described
         in a Registration Statement or the Prospectuses which are not
         described as required or of any contracts or documents of a character
         required to be described in a Registration Statement or the
         Prospectuses or to be filed as exhibits to a Registration Statement
         which are not described and filed as required; it being understood
         that such counsel need express no opinion as to the financial
         statements or other financial data contained in the Registration
         Statements or the Prospectuses;

                  (viii) This Agreement has been duly authorized, executed and
         delivered by each of the Sellers and the International Underwriting
         Agreement has been duly authorized, executed and delivered by the
         Issuer;

                  (ix) No prior or subsequent consent, approval, authorization
         or order of the FCC is required to be obtained, and no prior or
         subsequent notice to or filing with the FCC is required to be made, in
         connection with the offering of Offered Securities;

                  (x) To the best of such counsel's knowledge, the Issuer and
         its subsidiaries are in compliance in all material respects with all
         material terms and conditions of each License;

                  (xi) To the best of such counsel's knowledge, all of the
         Licenses are currently valid and in full force and effect, and there
         is no investigation, notice of apparent liability, violation,
         forfeiture or other order of complaint issued by or before any court
         or regulatory body, including the FCC, or of any other proceedings
         (other than proceedings relating to the wireless communications
         industries generally) which could in any manner materially threaten or
         adversely affect the validity or continued effectiveness of any of the
         Licenses; provided, however, that (A) on March 9, 1998, several
         parties (at least one of which stated that it would be filing a
         separate pleading on this issue) filed petitions for reconsideration
         of the 38 GHz Order, alleging, among other things, that the 


<PAGE>
                                       23


         February 10, 1998, license grants to the Issuer were in violation of
         the FCC's processing rules, which petitions for reconsideration were
         made available to the public on March 10, 1998 and (B) on December 31,
         1998, two parties filed petitions for clarification and
         reconsideration of two December 1, 1998 License correction grants to
         the Issuer in Atlanta and Dallas alleging that such grants were in
         violation of the rules of the FCC;

                  (xii) Such counsel is not aware of any event or instance in
         which the Issuer was not in compliance with all applicable and
         material rules, regulations and policies of the FCC pertaining to the
         Licenses;

                  (xiii) Such counsel is not aware of the occurrence of any
         event which (i) results in, or after notice or lapse of time or both
         would result in, revocation, suspension, adverse modification,
         nonrenewal, impairment, restriction or termination of, or order of
         forfeiture with respect to, any License or (ii) materially and
         adversely affects or could reasonably be expected in the future to
         materially adversely affect any of the rights of the Issuer or any of
         its subsidiaries thereunder;

                  (xiv) To the best of such counsel's knowledge, the Issuer and
         its subsidiaries have duly filed in a timely manner all material
         filings, reports, applications, documents, instruments and information
         required to be filed by them under the Communications Act pertaining
         to the Licenses;

                  (xv) Such counsel has no reason to believe that any of the
         Licenses will not be renewed in the ordinary course; and

                  (xvi) The FCC has the authority, under certain circumstances,
         to modify radio licenses that it has issued. On November 3, 1997, the
         FCC adopted rules to auction unlicensed portions of the 38.6 - 40.0
         GHz band for commercial use. On March 24, 1997, the FCC proposed rules
         to segment the 38.6 - 40.0 GHz band for terrestrial wireless services.
         In either event, the FCC may adopt changes to the existing and
         proposed regulations governing 38 GHz licensees, which could have an
         impact on the scope of the Licenses and the operations of the Issuer
         and its subsidiaries. As of the date of such letter, and except as
         otherwise discussed in such letter, such counsel is not aware of any
         official FCC action that may permit or is likely to lead to the
         revocation, nonrenewal, modification, impairment, restriction, or
         suspension of any License or any right or authority thereunder in
         whole or in part.

         (f) The Underwriters shall have received from Cravath, Swaine & Moore,
counsel for the Underwriters, such opinion or opinions, dated the Closing Date,
with respect to the incorporation of the Issuer, the validity of the Offered
Securities, the Registration Statements, the Prospectuses and other related
matters as Salomon may reasonably 


<PAGE>
                                       24


require, and the Issuer shall have furnished to such counsel such documents as
they reasonably request for the purpose of enabling them to pass upon such
matters.

         (g) The Representatives shall have received a certificate, dated the
Closing Date, of the Chief Executive Officer or any Vice President and a
principal financial or accounting officer of the Issuer in which such officers,
to the best of their knowledge after reasonable investigation, shall state that
the representations and warranties of the Issuer in this Agreement are true and
correct, that the Issuer has complied with all agreements and satisfied all
conditions on its part to be performed or satisfied hereunder at or prior to
the Closing Date; no stop order suspending the effectiveness of any
Registration Statement has been issued and no proceedings for that purpose have
been instituted or are contemplated by the Commission; the Additional
Registration Statement (if any) satisfying the requirements of subparagraphs
(1) and (3) of Rule 462(b) was filed pursuant to Rule 462(b), including payment
of the applicable filing fee in accordance with Rule 111(a) or (b) under the
Securities Act, prior to the time either Prospectus was printed and distributed
to any Underwriter; and, subsequent to the respective dates of the most recent
financial statements in the Prospectuses, there has been no material adverse
change, nor any development or event involving a prospective material adverse
change, in the condition (financial or other), business, properties or results
of operations of the Issuer and its subsidiaries taken as a whole except as set
forth in or contemplated by the Prospectuses or as described in such
certificate (it being understood that a change in the price of the Common Stock
or the continuation of operating losses consistent with the Issuer's historical
results shall be deemed not to be, in and of themselves, such a material
adverse change), and, except as disclosed in or contemplated by the
Prospectuses, there has been no dividend or distribution of any kind declared,
paid or made by the Issuer on any class of its capital stock. The
Representatives shall have received a certificate, dated the Closing Date, of
the Chief Executive Officer or any Vice President and a principal financial or
accounting officer of WMC in which such officers, to the best of their
knowledge after reasonable investigation, shall state that the representations
and warranties of WMC in this Agreement are true and correct, that WMC has
complied with all agreements and satisfied all conditions on its part to be
performed or satisfied hereunder at or prior to the Closing Date.

         (h) The Representatives shall have received a letter, dated the
Closing Date, of Grant Thornton LLP which meets the requirements of subsection
(a) of this Section, except that the specified date referred to in such
subsection will be a date not more than three days prior to such Closing Date
for the purposes of this subsection.

         (i) The Representatives shall have received a letter, dated the
Closing Date, of Ernst & Young LLP which meets the requirements of subsection
(b) of this Section, except that the specified date referred to in such
subsection will be a date not more than three business days prior to such
Closing Date for the purposes of this subsection.


<PAGE>
                                                                             25


         (j) On such Closing Date, the International Underwriters shall have
purchased the International Securities pursuant to the International
Underwriting Agreement.

         (k) The Issuer has filed an application and received approval for the
listing of the Offered Securities with the Nasdaq National Market and has paid
the required fee.

         (l) Each executive officer and director of the Issuer shall have
furnished to the Representatives a letter substantially in the form of Exhibit
A hereto and addressed to the Representatives relating to sales of shares of
Common Stock or any securities convertible into or exercisable or exchangeable
for such Common Stock, and each such letter shall be in full force and effect
on the Closing Date.

         Each of the Sellers will furnish the Representatives with such
conformed copies of such opinions, certificates, letters and documents as the
Representatives reasonably request. Salomon may in its sole discretion waive on
behalf of the Underwriters compliance with any conditions to the obligations of
the Underwriters hereunder, whether in respect of an Initial Closing Date or
otherwise.

         7. Indemnification and Contribution. (a) The Issuer will indemnify and
hold harmless each Underwriter against any losses, claims, damages or
liabilities, joint or several, to which such Underwriter may become subject,
under the Securities Act or the Exchange Act or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise
out of or are based upon any breach of any of the representations and
warranties of the Issuer contained herein or any untrue statement or alleged
untrue statement of any material fact contained in any Registration Statement,
either of the Prospectuses, or any amendment or supplement thereto, or any
related preliminary prospectus, or arise out of or are based upon the omission
or alleged omission to state therein a material fact necessary in order to make
the statements therein, in the light of the circumstances under which they were
made, not misleading, and will reimburse each Underwriter for any legal or
other expenses reasonably incurred by each Underwriter in connection with
investigating or defending any such loss, claim, damage, liability or action as
such expenses are incurred; provided, however, that the Issuer will not be
liable in any such case to the extent that any such loss, claim, damage or
liability arises out of or is based upon an untrue statement or alleged untrue
statement in or omission or alleged omission from any of such documents in
reliance upon and in conformity with written information furnished to the
Issuer by such Underwriter through Salomon specifically for use therein, it
being understood and agreed that the only such information consists of the
information described as such in subsection (c) below; provided further,
however, that with respect to any untrue statement or alleged untrue statement
in or omission or alleged omission from any preliminary prospectus, the
indemnity agreement contained in this subsection (a) shall not inure to the
benefit of any Underwriter that sold the Offered Securities concerned to the
person asserting any such losses, claims, damages or liabilities, to the extent
that such sale was an initial resale by 


<PAGE>
                                                                             26


such Underwriter and any such loss, claim, damage or liability of such
Underwriter results from the fact that there was not sent or given to such
person, at or prior to the written confirmation of the sale of such Offered
Securities to such person, a copy of the Registration Statement or Prospectus
if the Issuer had previously furnished copies thereof to such Underwriter and
such Registration Statement or Prospectus corrected such untrue statement or
omission or alleged untrue statement or omission.

         (b) WMC will indemnify and hold harmless each Underwriter against any
losses, claims, damages or liabilities, joint or several, to which such
Underwriter may become subject, under the Securities Act or otherwise, insofar
as such losses, claims, damages or liabilities (or actions in respect thereof)
arise out of or are based upon any breach of any of the representations and
warranties of WMC contained herein or any untrue statement or alleged untrue
statement of any material fact contained in any Registration Statement, either
of the Prospectuses, or any amendment or supplement thereto, or any related
preliminary prospectus, or arise out of or are based upon the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in reliance upon and in
conformity with written information about WMC (or any direct or indirect
stockholders of WMC) furnished to the Issuer by WMC specifically for use
therein, and will reimburse each Underwriter for any legal or other expenses
reasonably incurred by such Underwriter in connection with investigating or
defending any such loss, claim, damage, liability or action as such expenses
are incurred; provided, however, that WMC will not be liable in any such case
to the extent that any such loss, claim, damage or liability arises out of or
is based upon an untrue statement or alleged untrue statement in or omission or
alleged omission from any of such documents in reliance upon and in conformity
with written information furnished to the Issuer by an Underwriter through the
Representatives specifically for use therein, it being understood and agreed
that the only such information furnished by any Underwriter consists of the
information described as such in subsection (c) below; provided further,
however, that with respect to any untrue statement or alleged untrue statement
in or omission or alleged omission from any preliminary prospectus, the
indemnity agreement contained in this subsection (b) shall not inure to the
benefit of any Underwriter that sold the Offered Securities concerned to the
person asserting any such losses, claims, damages or liabilities, to the extent
that such sale was an initial resale by such Underwriter and any such loss,
claim, damage or liability of such Underwriter results from the fact that there
was not sent or given to such person, at or prior to the written confirmation
of the sale of such Offered Securities to such person, a copy of the
Registration Statement or Prospectus if the Issuer had previously furnished
copies thereof to such Underwriter and such Registration Statement or
Prospectus corrected such untrue statement or omission or alleged untrue
statement or omission.


<PAGE>
                                                                             27


         (c) Each Underwriter will severally and not jointly indemnify and hold
harmless the Sellers against any losses, claims, damages or liabilities to
which the Sellers may become subject, under the Securities Act or the Exchange
Act or otherwise, insofar as such losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon any untrue statement
or alleged untrue statement of any material fact contained in the Registration
Statement, either of the Prospectuses, or any amendment or supplement thereto,
or any related preliminary offering prospectus, or arise out of or are based
upon the omission or the alleged omission to state therein a material fact
necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in reliance upon and in
conformity with written information furnished to the Issuer by such Underwriter
through the Representatives specifically for use therein, and will reimburse
any legal or other expenses reasonably incurred by the Sellers in connection
with investigating or defending any such loss, claim, damage, liability or
action as such expenses are incurred, it being understood and agreed that the
only such information furnished by any Underwriter consists of the following
information in the U.S. Prospectus furnished on behalf of the Underwriters: (i)
on the cover page, the table and the last paragraph at the bottom concerning
the terms of the U.S. Offering by the Underwriters, (ii) under the caption
underwriting, (A) the list of Underwriters and their respective participation
in the U.S. Offering, (B) the fourth paragraph concerning the concession and
reallowance figures, (C) the seventh paragraph concerning agreements among the
Underwriters and the International Underwriters, (D) the tenth paragraph
concerning over-allotments, syndicate covering transactions, stabilizing
transactions and penalty bids and (E) the eleventh paragraph concerning passive
market making.

         (d) Promptly after receipt by an indemnified party under this Section
of notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against the indemnifying party under
subsection (a), (b) or (c) above, notify the indemnifying party of the
commencement thereof; but the omission so to notify the indemnifying party will
not relieve it from any liability which it may have to any indemnified party
otherwise than under subsection (a), (b) or (c) above. In case any such action
is brought against any indemnified party and it notifies the indemnifying party
of the commencement thereof, the indemnifying party will be entitled to
participate therein and, to the extent that it may wish, jointly with any other
indemnifying party similarly notified, to assume the defense thereof, with
counsel reasonably satisfactory to such indemnified party (who shall not,
except with the consent of the indemnified party (which consent shall not be
unreasonably withheld), be counsel to the indemnifying party), and after notice
from the indemnifying party to such indemnified party of its election so to
assume the defense thereof, the indemnifying party will not be liable to such
indemnified party under this Section for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof except as set forth below. Notwithstanding the indemnifying party's
election to appoint counsel to


<PAGE>
                                                                             28


represent the indemnified party in an action, the indemnified party shall have
the right to employ separate counsel (including local counsel), and the
indemnifying party shall bear the reasonable fees, costs and expenses of such
separate counsel, if (i) the use of counsel chosen by the indemnifying party to
represent the indemnified party would present such counsel with a conflict of
interest, (ii) the actual or potential defendants in, or targets of, any such
action include both the indemnified party and the indemnifying party and the
indemnified party shall have reasonably concluded that there may be legal
defenses available to it and/or other indemnified parties which are different
from or additional to those available to the indemnifying party, (iii) the
indemnifying party shall not have employed counsel satisfactory to the
indemnified party to represent the indemnified party within a reasonable time
after notice of the institution of such action or (iv) the indemnifying party
shall authorize the indemnified party to employ separate counsel at the expense
of the indemnifying party. No indemnifying party shall, without the prior
written consent of the indemnified party (which consent shall not be
unreasonably withheld), effect any settlement of any pending or threatened
action in respect of which any indemnified party is or could have been a party
and indemnity could have been sought hereunder by such indemnified party unless
such settlement includes an unconditional release of such indemnified party
from all liability on any claims that are the subject matter of such action.

         (e) If the indemnification provided for in this Section is unavailable
or insufficient to hold harmless an indemnified party under subsection (a), (b)
or (c) above, then each indemnifying party shall contribute to the amount paid
or payable by such indemnified party as a result of the losses, claims, damages
or liabilities referred to in subsection (a), (b) or (c) above (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Sellers on the one hand and the Underwriters on the other from the offering of
the U.S. Offered Securities or (ii) if the allocation provided by clause (i)
above is not permitted by applicable law, in such proportion as is appropriate
to reflect not only the relative benefits referred to in clause (i) above but
also the relative fault of the Sellers on the one hand and the Underwriters on
the other in connection with the statements or omissions which resulted in such
losses, claims, damages or liabilities as well as any other relevant equitable
considerations. The relative benefits received by the Sellers on the one hand
and the Underwriters on the other shall be deemed to be in the same proportion
as the total net proceeds from the U.S. Offering (before deducting expenses but
after deducting the Underwriters' discounts and commissions) received by the
Sellers bear to the total discounts and commissions received by the
Underwriters from the Sellers under this Agreement. The relative fault shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to
state a material fact relates to information supplied by the Sellers or the
Underwriters and the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such untrue statement or omission. The
amount paid by an indemnified party as a result of the losses, claims, damages
or liabilities referred to in the first sentence of this subsection (e) shall
be deemed to include


<PAGE>
                                                                             29


any legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any action or claim which is the
subject of this subsection (e). Notwithstanding the provisions of this
subsection (e), no Underwriter shall be required to contribute any amount in
excess of the amount by which the total price at which the Offered Securities
purchased by it were resold exceeds the amount of any damages which such
Underwriter has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission. The Underwriters'
obligations in this subsection (e) to contribute are several in proportion to
their respective purchase obligations and not joint.

         (f) The obligations of the Sellers under this Section shall be in
addition to any liability which the Sellers may otherwise have and shall
extend, upon the same terms and conditions, to each person, if any, who
controls any Underwriter within the meaning of the Securities Act or the
Exchange Act; and the obligations of the Underwriters under this Section shall
be in addition to any liability which the respective Underwriters may otherwise
have and shall extend, upon the same terms and conditions, to each person, if
any, who controls the Issuer within the meaning of the Securities Act or the
Exchange Act.

         (g) The liability of WMC under its representations and warranties
contained in Section 2 hereof and under the indemnity and contribution
agreements contained in this Section 7 shall be limited to an amount equal to
the initial public offering price of the Firm Securities sold by WMC to the
Underwriters. The Sellers may agree, as between themselves and without limiting
the rights of the Underwriters under this Agreement, as to the respective
amounts of such liability for which they each shall be responsible.

         8. Default of Underwriters. If any Underwriter or Underwriters default
in their obligations to purchase U.S. Offered Securities hereunder and the
aggregate number of shares of U.S. Offered Securities that such defaulting
Underwriter or Underwriters agreed but failed to purchase does not exceed 10%
of the total number of shares of U.S. Offered Securities, Salomon may make
arrangements satisfactory to the Sellers for the purchase of such U.S. Offered
Securities by other persons, including any of the Underwriters, but if no such
arrangements are made by the Closing Date, the nondefaulting Underwriters shall
be obligated severally, in proportion to their respective commitments
hereunder, to purchase the U.S. Offered Securities that such defaulting
Underwriters agreed but failed to purchase. If any Underwriter or Underwriters
so default and the aggregate number of shares of U.S. Offered Securities with
respect to which such default or defaults occur exceeds 10% of the number of
shares of U.S. Offered Securities and arrangements satisfactory to Salomon and
the Sellers for the purchase of such U.S. Offered Securities by other persons
are not made within 36 hours after such default, this Agreement will terminate
without liability on the part of any nondefaulting Underwriter or the Sellers,
except as provided in Section 9. As used in this Agreement, the term
"Underwriter" 


<PAGE>
                                                                             30


includes any person substituted for an Underwriter under this Section. Nothing
herein will relieve a defaulting Underwriter from liability for its default.

         9. Survival of Certain Representations and Obligations. The respective
indemnities, agreements, representations, warranties and other statements of
the Sellers, their respective officers or directors and of the several
Underwriters set forth in or made pursuant to this Agreement will remain in
full force and effect, regardless of any investigation, or statement as to the
results thereof, made by or on behalf of any Underwriter, the Sellers, the
Issuer or any of their respective representatives, officers or directors or any
controlling person, and will survive delivery of and payment for the Offered
Securities. If for any reason the purchase of the Offered Securities by the
Underwriter is not consummated, the Issuer shall remain responsible for the
expenses to be paid or reimbursed by them pursuant to Section 5 (other than
with respect to a defaulting Underwriter) and the respective obligations of the
Sellers and the Underwriters pursuant to Section 7 shall remain in effect. If
the purchase of the Offered Securities by the Underwriters is not consummated
for any reason other than solely because of the termination of this Agreement
pursuant to Section 8 or solely because of the occurrence of any event
specified in clause (C), (D) or (E) of Section 6(d)(ii), the Issuer will
reimburse the Underwriters for all out-of-pocket expenses (including fees and
disbursements of counsel) reasonably incurred by them in connection with the
offering of the Offered Securities.

         10. Notices. All communications hereunder will be in writing and, if
sent to the Underwriters will be mailed, delivered or telecopied and confirmed
to the Underwriters, c/o Salomon Smith Barney Inc., 388 Greenwich Street, New
York, NY 10013 or, if sent to the Issuer, will be mailed, delivered or
electronically transmitted and confirmed to it at 230 Park Avenue, New York, NY
10169, Attention: Timothy R. Graham; provided, however, that any notice to an
Underwriter pursuant to Section 7 will be mailed, delivered or telecopied and
confirmed to such Underwriter.

         11. Successors. This Agreement will inure to the benefit of and be
binding upon the parties hereto and their respective successors and the
controlling persons referred to in Section 7, and no other person will have any
right or obligation hereunder.

         12. Offering by Underwriters. It is understood that the several
Underwriters propose to offer the Offered Securities for sale to the public as
set forth in the Prospectus.

         13. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.


<PAGE>
                                                                             31


         14. Applicable Law. This Agreement shall be governed by, and construed
in accordance with, the laws of the State of New York without regard to
principles of conflicts of laws.

         Each of the parties hereby submits to the nonexclusive jurisdiction of
the Federal and state courts in the Borough of Manhattan in The City of New
York in any suit or proceeding arising out of or relating to this Agreement or
the transactions contemplated hereby.


<PAGE>
                                                                             32


         If the foregoing is in accordance with the Representatives'
understanding of our agreement, kindly sign and return to us one of the
counterparts hereof, whereupon it will become a binding agreement among the
Issuer, WMC and the Underwriters in accordance with its terms.

                                      Very truly yours,

                                      WinStar Communications, Inc.

                                      By........................................
                                        Name:
                                        Title:

                                      WinStar Multichannel Corp.

                                      By........................................

                                        Name:
                                        Title:

The foregoing Underwriting Agreement 
is hereby confirmed and accepted 
as of the date first above written.

Salomon Smith Barney Inc.
Credit Suisse First Boston Corporation

Acting on behalf of themselves and as the
Representatives of the several Underwriters

By SALOMON SMITH BARNEY INC.

      By..........................................
        Name:
        Title:


<PAGE>


                                   SCHEDULE A

                                                         Number of
                                                      Firm Securities
Underwriters                                          to be Purchased
- ------------                                          ---------------
Salomon Smith Barney Inc...........................
Credit Suisse First Boston Corporation.............






Total..............................................         3,360,000
                                                           ==========


                                      A-1


<PAGE>



                                   SCHEDULE B




                                               Number of         Number of
                                                 Firm            Optional
                                             Securities to     Securities to
                                                be Sold           be Sold
                                                -------           -------

WinStar Communications, Inc................     2,410,000          630,000
WinStar Multichannel Corp..................       950,000                0
                                             ------------      -----------
Total......................................     3,360,000          630,000
                                             ============      ===========





                                      B-1


<PAGE>






                                   Exhibit A

                                                                         [DATE]

[The undersigned executive officer or director]
WinStar Communications, Inc.
230 Park Avenue
New York, NY 10169

Salomon Smith Barney Inc.
Credit Suisse First Boston Corporation
As Representatives of the Several U.S. Underwriters
   c/o Salomon Smith Barney Inc.
   388 Greenwich Street
   New York, NY 10013

Salomon Brothers International Limited
Credit Suisse First Boston (Europe) Limited
  c/o Salomon Brothers International Limited
  3 Lombard Street
  London EC3V 9AA

Dear Sirs:

         As an inducement to the U.S. Underwriters and International
Underwriters to execute, respectively, the U.S. Underwriting Agreement and the
International Underwriting Agreement (collectively, the "Underwriting
Agreements"), pursuant to which an offering will be made of the Common Stock,
$0.01 par value per share (the "Securities") of WinStar Communications, Inc.
(the "Issuer"), the undersigned hereby agrees that, for a period of 90 days
after the date of the Underwriting Agreements (the "Applicable Period") to
which you are or expect to become parties, the undersigned will not offer, sell
(except that the undersigned may, with the consent of Salomon Smith Barney Inc.
(which consent shall not be unreasonably withheld), sell securities out of his
customary margin account), contract to sell, pledge or otherwise dispose of,
directly or indirectly, or (except pursuant to agreements executed on or prior
to the date hereof) arrange to have declared effective during the Applicable
Period a registration statement under the Securities Act covering the sale by
the undersigned of (a) any shares of Common Stock of the Issuer or any other
capital stock of the Issuer or (b) any other securities which are convertible
into, or exercisable or exchangeable for, Common Stock or other capital stock
of the Issuer (collectively, "Derivative Securities"), without the prior
written consent of Salomon Smith Barney Inc. (which shall not be unreasonably
withheld), except that the foregoing restrictions shall not apply to (i)
securities transferred by the undersigned in a private transaction where the
transferee receiving such securities agrees to be bound, (ii) the transfer of
no more than 70,000 securities per each of the four inside directors or (iii)
the transfer of no more than 25,000 securities per each of the four independent
directors.

         In furtherance of the foregoing, the Issuer and its transfer agent and
registrar are hereby authorized to decline to make any transfer of shares of
Securities if such transfer would constitute a violation or breach of this
Agreement.

         This Agreement shall be binding on the undersigned and the respective
successors, heirs, personal representatives and assigns of the undersigned.
This Agreement shall lapse and become null and void if the public offering
shall not have occurred on or before the date that is 60 days after the date of
this Agreement.


                                             Very truly yours,


                                                   B-2






<PAGE>


                                 840,000 Shares

                          WINSTAR COMMUNICATIONS, INC.

                         Common Stock ($0.01 par value)

                      INTERNATIONAL UNDERWRITING AGREEMENT

                                                              January [o], 1999



TO:  SALOMON BROTHERS INTERNATIONAL LIMITED

     CREDIT SUISSE FIRST BOSTON (EUROPE) LIMITED

c/o: SALOMON BROTHERS INTERNATIONAL LIMITED ("SALOMON INTERNATIONAL")
           3 Lombard Street
           London EC3V 9AA


 Ladies and Gentlemen:

         1. Introductory. WinStar Communications, Inc., a Delaware corporation
(the "Issuer" or "WinStar"), has agreed, subject to the terms and conditions
stated herein, to issue and sell (the "International Offering") to the several
international underwriters named in Schedule A hereto (the "International
Underwriters") an aggregate of 840,000 shares (the "International Securities")
of the Issuer's Common Stock, $0.01 par value per share ("Common Stock").

         It is understood that the Issuer and WinStar Multichannel Corp.
("WMC") are concurrently entering into a U.S. Underwriting Agreement, dated the
date hereof (the "U.S. Underwriting Agreement"), with certain U.S. underwriters
listed in Schedule A thereto (the "U.S. Underwriters"), for whom Salomon Smith
Barney Inc. ("Salomon") and Credit Suisse First Boston Corporation are acting
as representatives (the "U.S. Representatives") relating to the concurrent
offering and sale of 3,360,000 shares (the "Firm Securities") of Common Stock
in the United States and Canada (the "U.S. Offering"). The Issuer also proposes
to grant to the U.S. Underwriters an option, exercisable by Salomon, for an
aggregate of not more than 630,000 additional shares (the 


<PAGE>


"Optional Securities"). The Firm Securities and the Optional Securities are
herein collectively called the "U.S. Offered Securities". The U.S. Offered
Securities and the International Securities are collectively referred to as the
"Offered Securities". The United States Securities Act of 1933 is herein
referred to as the "Securities Act". To provide for the coordination of their
activities, the U.S. Underwriters and the International Underwriters have
entered into an Agreement Between U.S. Underwriters and International
Underwriters which permits them, among other things, to sell the Offered
Securities to each other for purposes of resale.

         The Issuer hereby agrees with the several International Underwriters
as follows:

         2. Representations and Warranties of the Issuer. The Issuer represents
and warrants to, and agrees with, the several International Underwriters that:


<PAGE>
                                                                              3


                  (a) A registration statement on Form S-3 (No. 333-70263)
         relating to the Offered Securities, including a form of prospectus
         relating to the U.S. Offered Securities and a form of prospectus
         relating to the International Securities, has been filed with the
         Securities and Exchange Commission (the "Commission") and either (i)
         has been declared effective under the Securities Act and is not
         proposed to be amended or (ii) is proposed to be amended by amendment
         or post-effective amendment. If such registration statement ("Initial
         Registration Statement") has been declared effective, either (i) an
         additional registration statement ("Additional Registration
         Statement") relating to the Offered Securities may have been filed
         with the Commission pursuant to Rule 462(b) ("Rule 462(b)") under the
         Securities Act and, if so filed, has become effective upon filing
         pursuant to such Rule and the Offered Securities all have been duly
         registered under the Securities Act pursuant to the Initial
         Registration Statement and, if applicable, the Additional Registration
         Statement or (ii) such an Additional Registration Statement is
         proposed to be filed with the Commission pursuant to Rule 462(b) and
         will become effective upon filing pursuant to such Rule and upon such
         filing the Offered Securities will all have been duly registered under
         the Securities Act pursuant to the Initial Registration Statement and
         such Additional Registration Statement. If the Issuer does not propose
         to amend the Initial Registration Statement or if an Additional
         Registration Statement has been filed and the Issuer does not propose
         to amend it, and if any post-effective amendment to either such
         registration statement has been filed with the Commission prior to the
         execution and delivery of this Agreement, the most recent amendment
         (if any) to each such registration statement has been declared
         effective by the Commission or has become effective upon filing
         pursuant to Rule 462(c) ("Rule 462(c)") under the Securities Act or,
         in the case of the Additional Registration Statement, Rule 462(b). For
         purposes of this Agreement, "Effective Time" with respect to the
         Initial Registration Statement or, if filed prior to the execution and
         delivery of this Agreement, the Additional Registration Statement
         means (i) if the Issuer has advised Salomon International that it does
         not propose to amend such registration statement, the date and time as
         of which such registration statement, or the most recent
         post-effective amendment thereto (if any) filed prior to the execution
         and delivery of this Agreement, was declared effective by the
         Commission or has become effective upon filing pursuant to Rule
         462(c), or (ii) if the Issuer has advised Salomon International that it
         proposes to file an amendment or post-effective amendment to such
         registration statement, the date and time as of which such registration
         statement, as amended by such amendment or post-effective amendment, as
         the case may be, is declared effective by the Commission. If an
         Additional Registration Statement has not been filed prior to the
         execution and delivery of this Agreement but the Issuer has advised
         Salomon International that it proposes to file one, "Effective Time"
         with respect to such Additional Registration Statement means the date
         and time as of which such registration statement is filed and becomes
         effective pursuant to Rule 462(b). "Effective Date" with respect to


<PAGE>
                                                                              4


         the Initial Registration Statement or the Additional Registration
         Statement (if any) means the date of the Effective Time thereof. The
         Initial Registration Statement, as amended at its Effective Time,
         including (i) all information contained in the Additional Registration
         Statement (if any) and deemed to be a part of the Initial Registration
         Statement as of the Effective Time of the Additional Registration
         Statement pursuant to the General Instructions of the Form on which it
         is filed, (ii) all information (if any) deemed to be a part of the
         Initial Registration Statement as of its Effective Time pursuant to
         Rule 430A(b) ("Rule 430A(b)") under the Securities Act and (iii) all
         other material incorporated by reference therein, is hereinafter
         referred to as the "Initial Registration Statement". The Additional
         Registration Statement, as amended at its Effective Time, including (i)
         the contents of the Initial Registration Statement incorporated by
         reference therein, (ii) all information (if any) deemed to be a part of
         the Additional Registration Statement as of its Effective Time pursuant
         to Rule 430A(b) and (iii) all other material incorporated by reference
         therein, is hereinafter referred to as the "Additional Registration
         Statement". The Initial Registration Statement and the Additional
         Registration Statement are hereinafter referred to collectively as the
         "Registration Statements" and individually as a "Registration
         Statement". The form of prospectus relating to the U.S. Offered
         Securities and the form of Prospectus relating to the International
         Securities, each of which shall be deemed to include all material
         incorporated by reference therein and as first filed with the
         Commission pursuant to and in accordance with Rule 424(b) ("Rule
         424(b)") under the Securities Act or (if no such filing is required) as
         included in a Registration Statement, are hereinafter referred to as
         the "U.S. Prospectus" and the "International Prospectus", respectively,
         and collectively as the "Prospectuses". No document has been or will be
         prepared or distributed in reliance on Rule 434 under the Securities
         Act.

                  (b) If the Effective Time of the Initial Registration
         Statement is prior to the execution and delivery of this Agreement:
         (i) on the Effective Date of the Initial Registration Statement, the
         Initial Registration Statement conformed in all respects to the
         requirements of the Securities Act and the rules and regulations of
         the Commission ("Rules and Regulations") and did not include any
         untrue statement of a material fact or omit to state any material fact
         required to be stated therein or necessary to make the statements
         therein not misleading, (ii) on the Effective Date of the Additional
         Registration Statement (if any), each Registration Statement
         conformed, or will conform, in all respects to the requirements of the
         Securities Act and the Rules and Regulations and did not include, or
         will not include, any untrue statement of a material fact and did not
         omit, or will not omit, to state any material fact required to be
         stated therein or necessary to make the statements therein not
         misleading and (iii) on the date of this Agreement, the Initial
         Registration Statement and, if the Effective Time of the Additional
         Registration Statement is prior to the execution and delivery of this
         Agreement, 


<PAGE>
                                                                              5


         the Additional Registration Statement each conforms, and at the time
         of filing of each of the Prospectuses pursuant to Rule 424(b) or (if
         no such filing is required) at the Effective Date of the Additional
         Registration Statement in which the Prospectuses are included, each
         Registration Statement and each of the Prospectuses will conform in
         all respects to the requirements of the Securities Act and the Rules
         and Regulations, and none of such documents includes, or will include,
         any untrue statement of a material fact or omits, or will omit, to
         state any material fact required to be stated therein or necessary to
         make the statements therein not misleading. If the Effective Time of
         the Initial Registration Statement is subsequent to the execution and
         delivery of this Agreement: on the Effective Date of the Initial
         Registration Statement, the Initial Registration Statement and each of
         the Prospectuses will conform in all respects to the requirements of
         the Securities Act and the Rules and Regulations, none of such
         documents will include any untrue statement of a material fact or will
         omit to state any material fact required to be stated therein or
         necessary to make the statements therein not misleading, and no
         Additional Registration Statement has been or will be filed. The two
         preceding sentences do not apply to statements in or omissions from a
         Registration Statement or either of the Prospectuses based upon
         written information furnished to the Issuer by any International
         Underwriter through Salomon International or by any U.S. Underwriter
         through the U.S. Representatives specifically for use therein, it
         being understood and agreed that the only such information is that
         described as such in Section 7(b) hereof. The Issuer's Annual Report
         on Form 10-K most recently filed with the Commission and all
         subsequent reports (collectively, the "Exchange Act Reports") which
         have been filed by WinStar with the Commission or sent to stockholders
         pursuant to the Securities Exchange Act of 1934 (the "Exchange Act"),
         when they were filed with the Commission, conformed in all material
         respects to the requirements of the Exchange Act and the Rules and
         Regulations of the Commission thereunder.

                  (c) The Issuer has been duly incorporated and is an existing
         corporation in good standing under the laws of the State of Delaware,
         with corporate power and authority to own its properties and conduct
         its business as described in each of the Prospectuses; and the Issuer
         is duly qualified to do business as a foreign corporation in good
         standing in all other jurisdictions in which its ownership or lease of
         property or the conduct of its business requires such qualification,
         except to the extent that the failure to be so qualified or be in good
         standing would not have a material adverse effect on the condition
         (financial or other), business, properties or results of operations of
         the Issuer and its subsidiaries, taken as a whole (a "Material Adverse
         Effect"). The Issuer is qualified to do business as a foreign
         corporation in the State of New York.

                  (d) Each subsidiary of the Issuer has been duly incorporated
         and is an existing corporation in good standing under the laws of the
         jurisdiction of its 


<PAGE>
                                                                              6


         incorporation, with corporate power and authority to own its
         properties and conduct its business as described in each of the
         Prospectuses; and each subsidiary of the Issuer is duly qualified to
         do business as a foreign corporation in good standing in all other
         jurisdictions in which its ownership or lease of property or the
         conduct of its business requires such qualification, except to the
         extent that the failure to be so qualified or be in good standing
         would not have a Material Adverse Effect; all of the issued and
         outstanding capital stock of each subsidiary of the Issuer has been
         duly authorized and validly issued and is fully paid and
         nonassessable; and the capital stock of each subsidiary owned by the
         Issuer, directly or through subsidiaries, is owned free from liens,
         encumbrances and defects.

                  (e) The Offered Securities and all other outstanding shares
         of capital stock of the Issuer have been duly authorized; all
         outstanding shares of capital stock of the Issuer are, and, when the
         Offered Securities have been delivered and paid for in accordance with
         this Agreement and the U.S. Underwriting Agreement on each Closing
         Date (as defined below), such Offered Securities will have been
         validly issued, fully paid and nonassessable and will conform in all
         material respects to the description thereof contained in the
         Prospectuses; and the stockholders of the Issuer have no preemptive
         rights with respect to the Offered Securities.

                  (f) Except as contemplated by this Agreement or as disclosed
         in the Prospectuses, there are no contracts, agreements or
         understandings between the Issuer and any person that would give rise
         to a valid claim against the Issuer or any International Underwriter
         or U.S. Underwriter for a brokerage commission, finder's fee or other
         like payment in connection with the transactions contemplated by this
         Agreement.

                  (g) Except as disclosed in the Prospectuses or in the
         schedule previously provided to you, there are no contracts,
         agreements or understandings between the Issuer and any person
         granting such person the right to require the Issuer to file a
         registration statement under the Securities Act with respect to any
         securities of the Issuer owned or to be owned by such person or to
         require the Issuer to include such securities in the securities
         registered pursuant to a Registration Statement or in any securities
         being registered pursuant to any other registration statement filed by
         the Issuer under the Securities Act.

                  (h) The Offered Securities have been approved for listing on
         The Nasdaq National Market.

                  (i) No consent, approval, authorization, or order of, or
         filing with, any governmental agency or body or any court is required
         for the consummation of the transactions contemplated by this
         Agreement or the U.S. Underwriting Agreement 


<PAGE>
                                                                              7


         in connection with the issuance and sale of the Offered Securities by
         the Issuer, other than as may be required under the Securities Act and
         the Rules and Regulations of the Commission thereunder and such as may
         be required by securities or blue sky laws of any state of the United
         States or of any foreign jurisdiction in connection with the offer and
         sale of the Offered Securities.

                  (j) The execution, delivery and performance of this Agreement
         and the U.S. Underwriting Agreement, and the issuance and sale of the
         Offered Securities will not result in a breach or violation of any of
         the terms and provisions of, or constitute a default under, (i) any
         statute, rule, regulation or order of any governmental agency or body
         or any court, domestic or foreign, having jurisdiction over the Issuer
         or any subsidiary of the Issuer or any of their properties, (ii) any
         agreement or instrument to which the Issuer or any such subsidiary is
         a party or by which the Issuer or any such subsidiary is bound or to
         which any of the properties of the Issuer or any such subsidiary is
         subject, or (iii) the charter or by-laws of the Issuer or any such
         subsidiary, except, in the case of clause (i) or (ii), such breaches,
         violations or defaults that individually or in the aggregate would not
         have a Material Adverse Effect; and the Issuer has full corporate
         power and authority to authorize, issue and sell the Offered
         Securities to be sold by the Issuer as contemplated by this Agreement
         and the U.S. Underwriting Agreement.

                  (k) This Agreement has been duly authorized, executed and
         delivered by the Issuer and the U.S. Underwriting Agreement has been
         duly authorized, executed and delivered by each of the Sellers (as
         defined therein).

                  (l) Except as disclosed in the Prospectuses, the Issuer and
         its subsidiaries have good and marketable title to all real properties
         and all other properties and assets owned by them, in each case free
         from liens, encumbrances and defects that would materially affect the
         value thereof or materially interfere with the use made or to be made
         thereof by them; and, except as disclosed in the Prospectuses, the
         Issuer and its subsidiaries hold any leased real or personal property
         under valid and enforceable leases with no exceptions that would
         materially interfere with the use made or to be made thereof by them.

                  (m) The Issuer and its subsidiaries possess adequate
         certificates, authorities or permits issued by appropriate
         governmental agencies or bodies necessary to conduct the business now
         operated by them and have not received any notice of proceedings
         relating to the revocation or modification of any such certificate,
         authority or permit that, individually or in the aggregate, could
         reasonably be expected to have a Material Adverse Effect.


<PAGE>
                                                                              8


                  (n) No labor dispute with the employees of the Issuer or any
         of its subsidiaries exists or, to the knowledge of the Issuer, is
         imminent that could reasonably be expected to have a Material Adverse
         Effect.

                  (o) The Issuer and its subsidiaries own, possess or can
         acquire on reasonable terms, adequate trademarks, trade names and
         other rights to inventions, know-how, patents, copyrights,
         confidential information and other intellectual property
         (collectively, "intellectual property rights") necessary to conduct
         the business as now operated by them, or used in the conduct of the
         business as now operated by them, except to the extent that the
         failure to own or possess or the inability to acquire such
         intellectual property rights would not individually or in the
         aggregate have a Material Adverse Effect; and the Issuer has not
         received any notice of infringement of or conflict with asserted
         rights of others with respect to any intellectual property rights
         that, if determined adversely to the Issuer or any of its
         subsidiaries, would individually or in the aggregate have a Material
         Adverse Effect.

                  (p) Except as disclosed in the Prospectuses, neither the
         Issuer nor any of its subsidiaries is in violation of any statute,
         rule, regulation, decision or order of any governmental agency or body
         or any court, domestic or foreign, relating to the use, disposal or
         release of hazardous or toxic substances or relating to the protection
         or restoration of the environment or human exposure to hazardous or
         toxic substances (collectively, "environmental laws"), owns or
         operates any real property contaminated with any substance that is
         subject to any environmental laws, is liable for any off-site disposal
         or contamination pursuant to any environmental laws, or is subject to
         any claim relating to any environmental laws, which violation,
         contamination, liability or claim would individually or in the
         aggregate have a Material Adverse Effect; and the Issuer is not aware
         of any pending investigation which might lead to such a claim.

                  (q) Except as disclosed in the Prospectuses, there are no
         pending actions, suits or proceedings against or affecting the Issuer,
         any of its subsidiaries or any of their respective properties that,
         individually or in the aggregate, could reasonably be expected to have
         a Material Adverse Effect, or to materially and adversely affect the
         ability of the Issuer to perform its obligations under this Agreement
         or the U.S. Underwriting Agreement, or which are otherwise material in
         the context of the sale of the Offered Securities; and, to the
         Issuer's knowledge, no such actions, suits or proceedings are
         threatened or contemplated.

                  (r) The financial statements included in each Registration
         Statement and the Prospectuses present fairly the financial position
         of the Issuer and its consolidated subsidiaries as of the dates shown
         and their results of operations and cash flows for the periods shown,
         such financial statements have been prepared in 


<PAGE>
                                                                              9


         conformity with the generally accepted accounting principles in the
         United States applied on a consistent basis, the schedules included in
         each Registration Statement present fairly the information required to
         be stated therein, the assumptions used in preparing the pro forma
         financial statements included in each Registration Statement and the
         Prospectuses provide a reasonable basis for presenting the significant
         effects directly attributable to the transactions or events described
         therein, the related pro forma adjustments give appropriate effect to
         those assumptions, and the pro forma columns therein reflect the
         proper application of those adjustments to the corresponding
         historical financial statement amounts.

                  (s) Except as disclosed in the Prospectuses, since the date
         of the latest audited financial statements included in the
         Prospectuses, there has been no material adverse change, nor any
         development or event involving a prospective material adverse change,
         in the condition (financial or other), business, properties or results
         of operations of the Issuer and its subsidiaries taken as a whole (it
         being understood that a change in the price of the Common Stock or the
         continuation of operating losses consistent with the Issuer's
         historical results shall be deemed not to be, in and of themselves,
         such a material adverse change), and, except as disclosed in or
         contemplated by the Prospectuses, there has been no dividend or
         distribution of any kind declared, paid or made by the Issuer on any
         class of its capital stock.

                  (t) The Issuer is not an open-end investment company, unit
         investment trust or face-amount certificate company that is or is
         required to be registered under Section 8 of the United States
         Investment Company Act of 1940 (the "Investment Company Act"), nor is
         it a closed-end investment company required to be registered, but not
         registered, thereunder; and the Issuer is not and, after giving effect
         to the offering and sale of the Offered Securities and the application
         of the proceeds thereof as described in the Prospectuses, will not be
         an "investment company" as defined in the Investment Company Act.

                  (u) The Issuer is subject to Section 13 or 15(d) of the
         Exchange Act.

                  (v) The Issuer and its subsidiaries are in compliance in all
         material respects with the Communications Act of 1934 (as amended by
         the Telecommunications Act of 1996, the "Communications Act") and with
         all applicable rules, regulations and policies of the Federal
         Communications Commission (the "FCC").

                  (w) The Issuer has provided to the International Underwriters
         a complete and accurate list of all licenses granted to the Issuer and
         its subsidiaries [(other than experimental licenses in the 38 GHz
         portions of the radio spectrum and 


<PAGE>
                                                                             10


         licenses granted to the Issuer or its subsidiaries or acquired from
         Local Area Telecommunications, Inc. that are not in the 38 GHz portion
         of the radio spectrum)] by the FCC (the "Licenses"). All of the
         Licenses are currently valid and in full force and effect. Neither the
         Issuer nor any of its subsidiaries has any knowledge of any
         investigation, notice of apparent liability, violation, forfeiture or
         other order or complaint issued by or before any court or regulatory
         body, including the FCC, or of any other proceedings (other than
         proceedings relating to the wireless communications industries
         generally) which could in any manner materially threaten or adversely
         affect the validity or continued effectiveness of any of the Licenses,
         except that (A) on March 9, 1998, several parties filed petitions for
         reconsideration (the "Petitions") of the 38 GHz Order (as defined in
         the Prospectuses) alleging, among other things, that the February 10,
         1998 License grants to the Issuer of additional channels in each of
         Atlanta, Buffalo, Cincinnati, Dallas, Houston, Miami, New York, St.
         Louis, Seattle, Spokane and Tampa were in violation of the rules of
         the FCC and (B) on December 31, 1998, two parties filed petitions for
         clarification and reconsideration of two December 1, 1998 License
         correction grants to the Issuer in Atlanta and Dallas alleging that
         such grants were in violation of the rules of the FCC.

                  (x) No event has occurred which (i) results in, or after
         notice or lapse of time or both would result in, revocation,
         suspension, adverse modification, nonrenewal, impairment, restriction
         or termination of, or order of forfeiture with respect to, any License
         or (ii) materially and adversely affects or could reasonably be
         expected in the future to materially adversely affect any of the
         rights of the Issuer or any of its subsidiaries thereunder.

                  (y) The Issuer and its subsidiaries have duly filed in a
         timely manner all material filings, reports, applications, documents,
         instruments and information required to be filed by them under the
         Communications Act, and all such filings are true, correct and
         complete in all material respects.

                  (z) Neither the Issuer nor any of its subsidiaries has any
         reason to believe that any of the Licenses will not be renewed in the
         ordinary course.

         3. Purchase, Sale and Delivery of Offered Securities. On the basis of
the representations, warranties and agreements herein contained, but subject to
the terms and conditions herein set forth, the Issuer agrees to sell to the
International Underwriters, and each International Underwriter agrees,
severally and not jointly, to purchase, at a purchase price of U.S. $[ o ] per
share, from the Issuer that number of International Securities (rounded up or
down, as determined by Salomon International in its discretion, in order to
avoid fractions) obtained by multiplying the number of International Securities
set forth opposite the name of the Issuer in Schedule B hereto by a fraction
the numerator of which is the number of International Securities set forth
opposite the name of such International 


<PAGE>
                                                                             11


Underwriter in Schedule A hereto and the denominator of which is the total
number of International Securities.

         The Issuer will deliver the International Securities to Salomon
International for the accounts of the International Underwriters, against
payment of the purchase price in U.S. dollars Federal (same day) funds by wire
transfer to accounts previously designated to Salomon by the Issuer at one or
more financial institutions acceptable to Salomon International at the office
of Cravath, Swaine & Moore, 825 Eighth Avenue, New York, New York, 10019, at
9:00 A.M., New York time, on February [o ], 1999, or at such other time not
later than seven full business days thereafter as Salomon International and the
Issuer determine, such time being herein referred to as the "Closing Date". For
purposes of Rule 15c6-1 under the Exchange Act, the First Closing Date (if
later than the otherwise applicable settlement date) shall be the settlement
date for payment of funds and delivery of securities for all the Offered
Securities sold pursuant to the offering. The certificates for the
International Securities so to be delivered will be in definitive form, in such
denominations and registered in such names as Salomon International requests
and will be made available for checking and packaging at the above office of
Cravath, Swaine & Moore at least 24 hours prior to the First Closing Date.

         The Issuer will pay to the International Underwriters as aggregate
compensation for their commitments hereunder and for their services in
connection with the purchase of the International Securities and the management
of the International Offering thereof, if the sale and delivery of the
International Securities to the International Underwriters provided herein is
consummated, an amount equal to U.S. $[ o ] per International Security
purchased, which may be divided among the International Underwriters in such
proportions as they may determine. Such payment will be made on the Closing
Date in the case of the International Securities by way of deduction by the
International Underwriters of said amount from the purchase price for the
International Securities referred to above.

         4. Offering by International Underwriters. It is understood that the
several International Underwriters propose to offer the International
Securities for sale to the public as set forth in the International Prospectus.

         In connection with the distribution of the International Securities,
the International Underwriters, through a stabilizing manager, may over-allot
or effect transactions on any exchange, in any over-the-counter market or
otherwise which stabilize or maintain the market prices of the International
Securities at levels other than those which might otherwise prevail, but in
such event and in relation thereto, the International Underwriters will act for
themselves and not as agents of the Issuer, and any loss resulting from
over-allotment and stabilization will be borne, and any profit arising
therefrom will be beneficially retained, by the International Underwriters.
Such stabilizing, if commenced, may be discontinued at any time.


<PAGE>
                                                                             12


         5. Certain Agreements of the Issuer and the International
Underwriters. The Issuer and the several International Underwriters agree that:

         (a) If the Effective Time of the Initial Registration Statement is
prior to the execution and delivery of this Agreement, the Issuer will file
each of the Prospectuses with the Commission pursuant to and in accordance with
subparagraph (1) (or, if applicable and if consented to by Salomon
International, subparagraph (4)) of Rule 424(b) not later than the earlier of
(i) the second business day following the execution and delivery of this
Agreement or (ii) the fifteenth business day after the Effective Date of the
Initial Registration Statement. The Issuer will advise Salomon International
promptly of any such filing pursuant to Rule 424(b). If the Effective Time of
the Initial Registration Statement is prior to the execution and delivery of
this Agreement and an Additional Registration Statement is necessary to
register a portion of the Offered Securities under the Securities Act but the
Effective Time thereof has not occurred as of such execution and delivery, the
Issuer will file the Additional Registration Statement or, if filed, will file
a post-effective amendment thereto with the Commission pursuant to and in
accordance with Rule 462(b) on or prior to 10:00 P.M., New York time, on the
date of this Agreement or, if earlier, on or prior to the time either
Prospectus is printed and distributed to any International Underwriter or U.S.
Underwriter, or will make such filing at such later date as shall have been
consented to by Salomon International.

         (b) The Issuer will advise Salomon International promptly of any
proposal to amend or supplement the Initial Registration Statement, the
Additional Registration Statement (if any) and either of the Prospectuses and
will not effect such amendment or supplement without Salomon International's
prior consent (which consent shall not be unreasonably withheld); and the
Issuer will also advise Salomon International promptly of the effectiveness of
each Registration Statement (if its Effective Time is subsequent to the
execution and delivery of this Agreement) and of any amendment or supplement to
a Registration Statement or either of the Prospectuses and of the institution
by the Commission of any stop order proceedings in respect of a Registration
Statement and will use its best efforts to prevent the issuance of any such
stop order and to obtain as soon as possible its lifting, if issued.

         (c) If, at any time when a prospectus relating to the Offered
Securities is required to be delivered under the Securities Act in connection
with sales by any U.S. Underwriter, International Underwriter or dealer, any
event occurs as a result of which the Prospectus as then amended or
supplemented would include an untrue statement of a material fact or omit to
state any material fact necessary to make the statements therein, in the light
of the circumstances under which they were made, not misleading, or if it is
necessary at any time to amend the Prospectus to comply with the Securities
Act, the Issuer will promptly notify Salomon International of such event and
will promptly prepare and file with the 


<PAGE>
                                                                             13


Commission, at its own expense, an amendment or supplement which will correct
such statement or omission or an amendment which will effect such compliance.
Neither Salomon International's consent to, nor the International Underwriters'
delivery of, any such amendment or supplement shall constitute a waiver of any
of the conditions set forth in Section 6.

         (d) As soon as practicable, but not later than the Availability Date
(as defined below), the Issuer will make generally available to its
securityholders an earnings statement covering a period of at least 12 months
beginning after the Effective Date of the Initial Registration Statement (or,
if later, the Effective Date of the Additional Registration Statement) which
will satisfy the provisions of Section 11(a) of the Securities Act. For the
purpose of the preceding sentence, "Availability Date" means the 45th day after
the end of the fourth fiscal quarter following the fiscal quarter that includes
such Effective Date, except that, if such fourth fiscal quarter is the last
quarter of the Issuer's fiscal year, "Availability Date" means the 90th day
after the end of such fourth fiscal quarter.

         (e) The Issuer will furnish to the International Underwriters copies
of each Registration Statement (five of which will be signed and will include
all exhibits), each preliminary prospectus relating to the International
Securities, and, until completion of the distribution of the International
Securities as determined by Salomon International, the International Prospectus
and all amendments and supplements to such documents, in each case in such
quantities as Salomon International requests. The International Prospectus
shall be so furnished on or prior to 3:00 P.M., New York time, on the business
day following the later of the execution and delivery of this Agreement or the
Effective Time of the Initial Registration Statement. All other documents shall
be so furnished as soon as available. The Issuer will pay the expenses of
printing and distributing to the International Underwriters all such documents.

         (f) No action has been or, prior to the completion of the distribution
of the Offered Securities, will be taken by the Issuer in any jurisdiction
outside the United States and Canada that would permit a public offering of the
Offered Securities, or possession or distribution of the International
Prospectus, or any amendment or supplement thereto, or any related preliminary
prospectus issued in connection with the offering of the Offered Securities, or
any other offering material, in any country or jurisdiction where action for
that purpose is required.

         (g) During the period of five years after the Closing Date, the Issuer
will furnish to Salomon International and, upon request, to each of the other
International Underwriters, as soon as practicable after the end of each fiscal
year, a copy of the Issuer's annual report to stockholders for such year; and
the Issuer will furnish to Salomon International (i) as soon as available, a
copy of each report and any definitive proxy statement of the Issuer filed with
the Commission under the Exchange Act or 


<PAGE>
                                                                             14


mailed to stockholders and (ii) from time to time, such other publicly
available information concerning the Issuer as Salomon International may
reasonably request.

         (h) The Issuer will pay all expenses incident to the performance of
its obligations under this Agreement, for any filing fees and other expenses
(including fees and disbursements of counsel) incurred in connection with
qualification of the Offered Securities for sale under the laws of such
jurisdictions as Salomon International designates and the printing of memoranda
relating thereto, for any travel expenses of the Issuer's officers and
employees and any other expenses of the Issuer in connection with attending or
hosting meetings with prospective purchasers of the Offered Securities, for any
transfer taxes on the sale of the Offered Securities and for expenses incurred
in distributing preliminary prospectuses and the Prospectuses (including any
amendments and supplements thereto) to the International Underwriters.

         (i) The Issuer agrees that no Common Stock other than the Offered
Securities will be included for sale with the Registration Statement.

         (j) For a period of 90 days after the date hereof (the "Applicable
Period"), the Issuer and the Issuer's executive officers and directors will not
sell (except that the executive officers and directors may, with the consent of
the Underwriters (which consent shall not be unreasonably withheld), sell
securities out of their customary margin accounts), contract to sell, pledge or
otherwise dispose of, directly or indirectly, or (except pursuant to agreements
executed on or prior to the date hereof) arrange to have declared effective
during the Applicable Period a registration statement under the Securities Act
covering the sale by the Issuer or the Issuer's executive officers and
directors of (i) any shares of Common Stock of the Issuer or any other capital
stock of the Issuer, or (ii) any other securities which are convertible into,
or exercisable or exchangeable for, Common Stock or other capital stock of the
Issuer (collectively, "Derivative Securities"), without the prior written
consent of Salomon, which shall not be unreasonably withheld, except (A) with
respect to the Issuer (1) Common Stock or preferred stock issued or delivered
as payment of dividends on, or upon conversion, of any preferred stock of the
Issuer, (2) securities issued or delivered upon conversion, exchange or
exercise of any other securities (including notes and debentures) of the Issuer
outstanding on the date of the Prospectuses or which become outstanding after
the date hereof without violating this section 5(j), (3) capital stock, options
and other equity- based awards issued pursuant to benefit or incentive plans
maintained for the officers, directors or employees of, or persons providing
services to, the Issuer or its subsidiaries, or pursuant to the Issuer's
dividend reinvestment, 401(k), stock purchase or similar plans, (4) securities
issued in connection with, or in furtherance of, mergers, acquisitions of
assets or equity of others (including spectrum licenses and application
therefor and interests in entities with spectrum licenses and application
therefor) or similar transactions, (5) securities representing a minority
interest in the Issuer issued to a strategic investor who agrees not to resell
such securities during the Applicable Period or


<PAGE>
                                                                             15


(6) Common Stock, preferred stock, other capital stock or Derivative Securities
in a transaction not registered under the Securities Act, if the Issuer does
not arrange to have a registration statement covering the resale of any such
securities declared effective during the Applicable Period, and (B) with
respect to the Issuer's executive officers and directors, (i) securities
transferred by an executive officer or director in a private transaction where
the transferee receiving such securities agrees to be bound by this section
5(j), (ii) the transfer of no more than 70,000 securities per each of the four
inside directors or (iii) the transfer of no more than 25,000 securities per
each of the four independent directors.

         (k) Each International Underwriter agrees that (i) it is not
purchasing any of the International Securities for the account of any U.S. or
Canadian Person, (ii) it has not offered or sold, and will not offer or sell,
directly or indirectly, any of the International Securities or distribute any
International Prospectus to any person in the United States or Canada, or to
any U.S. or Canadian Person and (iii) any dealer to whom it may sell any of the
International Securities will represent that it is not purchasing for the
account of any U.S. or Canadian Person and agree that it will not offer or
resell, directly or indirectly, any of the International Securities in the
United States or Canada, or to any U.S. or Canadian Person or to any other
dealer who does not so represent and agree; provided, however, that the
foregoing shall not restrict (A) purchases and sales between the International
Underwriters on the one hand and the U.S. Underwriters on the other hand
pursuant to the Agreement Between U.S. Underwriters and International
Underwriters, (B) stabilization transactions contemplated under the Agreement
Between U.S. Underwriters and International Underwriters, conducted through
Salomon (or through the Representatives and Salomon International) as part of
the distribution of the Offered Securities and (C) sales to or through (or
distributions of International Prospectuses or the related preliminary
prospectuses to) persons not U.S. or Canadian who are investment advisors, or
who otherwise exercise investment discretion, and who are purchasing for the
account of any U.S. or Canadian Person.

         6. Conditions of the Obligations of the International Underwriters.
The obligations of the several International Underwriters to purchase and pay
for the International Securities on the First Closing Date will be subject to
the accuracy of the representations and warranties on the part of the Issuer
herein, to the accuracy of the certificates of officers of the Issuer delivered
pursuant to the provisions hereof, to the performance by the Issuer of its
obligations hereunder and to the following additional conditions precedent:


<PAGE>
                                                                             16


         (a) The International Underwriters shall have received a letter, dated
the date of delivery thereof (which, if the Effective Time of the Initial
Registration Statement is prior to the execution and delivery of this
Agreement, shall be on or prior to the date of this Agreement or, if the
Effective Time of the Initial Registration Statement is subsequent to the
execution and delivery of this Agreement, shall be prior to the filing of the
amendment or post-effective amendment to the registration statement to be filed
shortly prior to such Effective Time), of Grant Thornton LLP, in the agreed
form.

         (b) The International Underwriters shall have received a letter, dated
the date of delivery thereof (which, if the Effective Time of the Initial
Registration Statement is prior to the execution and delivery of this
Agreement, shall be on or prior to the date of this Agreement or, if the
Effective Time of the Initial Registration Statement is subsequent to the
execution and delivery of this Agreement, shall be prior to the filing of the
amendment or post-effective amendment to the registration statement to be filed
shortly prior to such Effective Time), of Ernst & Young LLP in the agreed form.

         (c) If the Effective Time of the Initial Registration Statement is not
prior to the execution and delivery of this Agreement, such Effective Time
shall have occurred not later than 10:00 P.M., New York time, on the date of
this Agreement or such later date as shall have been consented to by Salomon
International. If the Effective Time of the Additional Registration Statement
(if any) is not prior to the execution and delivery of this Agreement, such
Effective Time shall have occurred not later than 10:00 P.M., New York time, on
the date of this Agreement or, if earlier, the time either Prospectus is
printed and distributed to any International Underwriter or U.S. Underwriter,
or shall have occurred at such later date as shall have been consented to by
Salomon International. If the Effective Time of the Initial Registration
Statement is prior to the execution and delivery of this Agreement, each of the
Prospectuses shall have been filed with the Commission in accordance with the
Rules and Regulations and Section 5(a) of this Agreement. Prior to such Closing
Date, no stop order suspending the effectiveness of a Registration Statement
shall have been issued and no proceedings for that purpose shall have been
instituted or, to the knowledge of the Issuer or the International
Underwriters, shall be contemplated by the Commission.

         (d) Subsequent to the execution and delivery of this Agreement, there
shall not have occurred (i) a change in U.S. or international financial,
political or economic conditions or currency exchange rates or exchange
controls as would, in the reasonable judgment of Salomon International, be
likely to prejudice materially the success of the proposed issue, sale or
distribution of the International Securities, whether in the primary market or
in respect of dealings in the secondary market, or (ii) (A) any change, or any
development or event involving a prospective change, in the condition
(financial or other), business, properties or results of operations of the
Issuer or its subsidiaries which, in the reasonable judgment of Salomon
International, is material and adverse and makes it impractical or inadvisable
to proceed with completion of the offering or the sale of and 


<PAGE>
                                                                             17


payment for the International Securities; (B) any downgrading in the rating of
any debt securities of the Issuer by any "nationally recognized statistical
rating organization" (as defined for purposes of Rule 436(g) under the
Securities Act), or any public announcement that any such organization has
under surveillance or review its rating of any debt securities of the Issuer
(other than an announcement with positive implications of a possible upgrading,
and no implication of a possible downgrading, of such rating); (C) any
suspension or limitation of trading in securities generally on the New York
Stock Exchange, or any setting of minimum prices for trading on such exchange,
or any suspension of trading of any securities of the Issuer on any exchange or
in the over-the-counter market; (D) any banking moratorium declared by U.S.
Federal or New York authorities; or (E) any outbreak or escalation of major
hostilities in which the United States is involved, any declaration of war by
Congress or any other substantial national or international calamity or
emergency if, in the reasonable judgment of Salomon International, the effect
of any such outbreak, escalation, declaration, calamity or emergency makes it
impractical or inadvisable to proceed with completion of the offering or sale
of and payment for the International Securities.

         (e) The International Underwriters shall have received opinions, dated
the Closing Date, of Graubard Mollen & Miller, counsel for the Issuer, and of
Willkie Farr & Gallagher, regulatory counsel for the Issuer, in the agreed
form.

         (f) The International Underwriters shall have received from Cravath,
Swaine & Moore, counsel for the International Underwriters, such opinion or
opinions, dated the Closing Date, with respect to the incorporation of the
Issuer, the validity of the Offered Securities, the Registration Statements,
the Prospectuses and other related matters as the International Underwriters
may reasonably require, and the Issuer shall have furnished to such counsel
such documents as they reasonably request for the purpose of enabling them to
pass upon such matters.

         (g) The International Underwriters shall have received a certificate,
dated the Closing Date, of the Chief Executive Officer or any Vice President
and a principal financial or accounting officer of the Issuer in which such
officers, to the best of their knowledge after reasonable investigation, shall
state that the representations and warranties of the Issuer in this Agreement
are true and correct, that the Issuer has complied with all agreements and
satisfied all conditions on its part to be performed or satisfied hereunder at
or prior to the Closing Date; no stop order suspending the effectiveness of any
Registration Statement has been issued and no proceedings for that purpose have
been instituted or are contemplated by the Commission; the Additional
Registration Statement (if any) satisfying the requirements of subparagraphs
(1) and (3) of Rule 462(b) was filed pursuant to Rule 462(b), including payment
of the applicable filing fee in accordance with Rule 111(a) or (b) under the
Securities Act, prior to the time either Prospectus was printed and distributed
to any International Underwriter or U.S. Underwriter; and, subsequent to the
respective dates of the most recent financial 


<PAGE>
                                                                             18


statements in the Prospectuses, there has been no material adverse change, nor
any development or event involving a prospective material adverse change, in
the condition (financial or other), business, properties or results of
operations of the Issuer and its subsidiaries taken as a whole except as set
forth in or contemplated by the Prospectuses or as described in such
certificate (it being understood that a change in the price of the Common Stock
or the continuation of operating losses consistent with the Issuer's historical
results shall be deemed not to be, in and of themselves, such a material
adverse change), and, except as disclosed in or contemplated by the
Prospectuses, there has been no dividend or distribution of any kind declared,
paid or made by the Issuer on any class of its capital stock.

         (h) The International Underwriters shall have received a letter, dated
the Closing Date, of Grant Thornton LLP which meets the requirements of
subsection (a) of this Section, except that the specified date referred to in
such subsection will be a date not more than three days prior to such Closing
Date for the purposes of this subsection.

         (i) The International Underwriters shall have received a letter, dated
the Closing Date, of Ernst & Young LLP which meets the requirements of
subsection (b) of this Section, except that the specified dated referred to in
such subsection will be a date not more than three business days prior to such
Closing Date for the purposes of this subsection.

         (j) On such Closing Date, the U.S. Underwriters shall have purchased
the Firm Securities or the U.S. Optional Securities, as the case may be,
pursuant to the U.S. Underwriting Agreement.

         (k) The Issuer has filed an application and received approval for the
listing of the Offered Securities with the Nasdaq National Market and has paid
the required fee.

         (l) Each executive officer and director of the Issuer shall have
furnished to Salomon International a letter substantially in the form of
Exhibit A hereto and addressed to the International Underwriters relating to
sales of shares of Common Stock or any securities convertible into or
exercisable or exchangeable for such Common Stock, and each such letter shall
be in full force and effect on the Closing Date.

Documents described as being "in the agreed form" are documents which are in
the forms which have been initialed for the purpose of identification by
Cravath, Swaine & Moore, copies of which are held by the Issuer and Salomon
International with such changes as Salomon International may approve. The
Issuer will furnish the International Underwriters with such conformed copies
of such opinions, certificates, letters and documents as the International
Underwriters reasonably request. Salomon International may in its sole
discretion waive on behalf of the International Underwriters compliance with
any conditions to the obligations of the International Underwriters hereunder.


<PAGE>
                                                                             19


         7. Indemnification and Contribution. (a) The Issuer will indemnify and
hold harmless each International Underwriter against any losses, claims,
damages or liabilities, joint or several, to which such International
Underwriter may become subject, under the Securities Act or the Exchange Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon any breach or alleged breach
of any of the representations and warranties of the Issuer contained herein or
any untrue statement or alleged untrue statement of any material fact contained
in any Registration Statement, either of the Prospectuses, or any amendment or
supplement thereto, or any related preliminary prospectus, or arise out of or
are based upon the omission or alleged omission to state therein a material
fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading, and will reimburse
each International Underwriter for any legal or other expenses reasonably
incurred by each International Underwriter in connection with investigating or
defending any such loss, claim, damage, liability or action as such expenses
are incurred; provided, however, that the Issuer will not be liable in any such
case to the extent that any such loss, claim, damage or liability arises out of
or is based upon an untrue statement or alleged untrue statement in or omission
or alleged omission from any of such documents in reliance upon and in
conformity with written information furnished to the Issuer by such
International Underwriter through Salomon International specifically for use
therein, it being understood and agreed that the only such information consists
of the information described as such in subsection (b) below; provided further,
however, that with respect to any untrue statement or alleged untrue statement
in or omission or alleged omission from any preliminary prospectus, the
indemnity agreement contained in this subsection (a) shall not inure to the
benefit of any International Underwriter that sold the Offered Securities
concerned to the person asserting any such losses, claims, damages or
liabilities, to the extent that such sale was an initial resale by such
International Underwriter and any such loss, claim, damage or liability of such
International Underwriter results from the fact that there was not sent or
given to such person, at or prior to the written confirmation of the sale of
such Offered Securities to such person, a copy of the Registration Statement or
Prospectus if the Issuer had previously furnished copies thereof to such
International Underwriter and such Registration Statement or Prospectus
corrected such untrue statement or omission or alleged untrue statement or
omission.

         (b) Each International Underwriter will severally and not jointly
indemnify and hold harmless the Issuer against any losses, claims, damages or
liabilities to which the Issuer may become subject, under the Securities Act or
the Exchange Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained in
the Registration Statement, either of the Prospectuses, or any amendment or
supplement thereto, or any related preliminary offering prospectus, or arise
out of or are based upon the omission or the alleged omission to state therein
a material 


<PAGE>
                                                                             20


fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in reliance upon and in
conformity with written information furnished to the Issuer by such
International Underwriter through Salomon International specifically for use
therein, and will reimburse any legal or other expenses reasonably incurred by
the Issuer in connection with investigating or defending any such loss, claim,
damage, liability or action as such expenses are incurred, it being understood
and agreed that the only such information furnished by any International
Underwriter consists of the following information in the International
Prospectus furnished on behalf of the International Underwriters: (i) on the
cover page, the table and the last paragraph at the bottom concerning the terms
of the International Offering by the International Underwriters and (ii) under
the caption "Underwriting", (A) the list of International Underwriters and
their respective participation in the International Offering, (B) the fourth
paragraph concerning the concession and reallowance figures, (C) the sixth
paragraph concerning agreements among the U.S. Underwriters and the
International Underwriters, (D) the eighth paragraph concerning
over-allotments, syndicate covering transactions, stabilizing transactions and
penalty bids and (E) the ninth paragraph concerning passive market making.

         (c) Promptly after receipt by an indemnified party under this Section
of notice of the commencement of any action, such indemnified party will, if a
claim in respect thereof is to be made against the indemnifying party under
subsection (a) or (b) above, notify the indemnifying party of the commencement
thereof; but the omission so to notify the indemnifying party will not relieve
it from any liability which it may have to any indemnified party otherwise than
under subsection (a) or (b) above. In case any such action is brought against
any indemnified party and it notifies the indemnifying party of the
commencement thereof, the indemnifying party will be entitled to participate
therein and, to the extent that it may wish, jointly with any other
indemnifying party similarly notified, to assume the defense thereof, with
counsel reasonably satisfactory to such indemnified party (who shall not,
except with the consent of the indemnified party (which consent shall not be
unreasonably withheld), be counsel to the indemnifying party), and after notice
from the indemnifying party to such indemnified party of its election so to
assume the defense thereof, the indemnifying party will not be liable to such
indemnified party under this Section for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof except as set forth below. Notwithstanding the indemnifying party's
election to appoint counsel to represent the indemnified party in an action,
the indemnified party shall have the right to employ separate counsel
(including local counsel), and the indemnifying party shall bear the reasonable
fees, costs and expenses of such separate counsel, if (i) the use of counsel
chosen by the indemnifying party to represent the indemnified party would
present such counsel with a conflict of interest, (ii) the actual or potential
defendants in, or targets of, any such action include both the indemnified
party and the


<PAGE>
                                                                             21


indemnifying party and the indemnified party shall have reasonably concluded
that there may be legal defenses available to it and/or other indemnified
parties which are different from or additional to those available to the
indemnifying party, (iii) the indemnifying party shall not have employed
counsel satisfactory to the indemnified party to represent the indemnified
party within a reasonable time after notice of the institution of such action
or (iv) the indemnifying party shall authorize the indemnified party to employ
separate counsel at the expense of the indemnifying party. No indemnifying
party shall, without the prior written consent of the indemnified party (which
consent shall not be unreasonably withheld), effect any settlement of any
pending or threatened action in respect of which any indemnified party is or
could have been a party and indemnity could have been sought hereunder by such
indemnified party unless such settlement includes an unconditional release of
such indemnified party from all liability on any claims that are the subject
matter of such action.

         (d) If the indemnification provided for in this Section is unavailable
or insufficient to hold harmless an indemnified party under subsection (a) or
(b) above, then each indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims, damages or
liabilities referred to in subsection (a) or (b) above (i) in such proportion
as is appropriate to reflect the relative benefits received by the Issuer on
the one hand and the International Underwriters on the other from the offering
of the International Securities or (ii) if the allocation provided by clause
(i) above is not permitted by applicable law, in such proportion as is
appropriate to reflect not only the relative benefits referred to in clause (i)
above but also the relative fault of the Issuer on the one hand and the
International Underwriters on the other in connection with the statements or
omissions which resulted in such losses, claims, damages or liabilities as well
as any other relevant equitable considerations. The relative benefits received
by the Issuer on the one hand and the International Underwriters on the other
shall be deemed to be in the same proportion as the total net proceeds from the
International Offering of the International Securities (before deducting
expenses) received by the Issuer bear to the total discounts and commissions
received by the International Underwriters from the Issuer under this
Agreement. The relative fault shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or
the omission or alleged omission to state a material fact relates to
information supplied by the Issuer or the International Underwriters and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such untrue statement or omission. The amount paid by an
indemnified party as a result of the losses, claims, damages or liabilities
referred to in the first sentence of this subsection (d) shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party in connection with investigating or defending any action or claim which
is the subject of this subsection (d). Notwithstanding the provisions of this
subsection (d), no International Underwriter shall be required to contribute
any amount in excess of the amount by which the total price at which the
International Securities purchased by it were resold exceeds the amount of any
damages which such International



<PAGE>
                                                                             22




Underwriter has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission. The International
Underwriters' obligations in this subsection (d) to contribute are several in
proportion to their respective purchase obligations and not joint.

         (e) The obligations of the Issuer under this Section shall be in
addition to any liability which the Issuer may otherwise have and shall extend,
upon the same terms and conditions, to each person, if any, who controls any
International Underwriter within the meaning of the Securities Act or the
Exchange Act; and the obligations of the International Underwriters under this
Section shall be in addition to any liability which the respective
International Underwriters may otherwise have and shall extend, upon the same
terms and conditions, to each person, if any, who controls the Issuer within
the meaning of the Securities Act or the Exchange Act.

         8. Default of International Underwriters. If any International
Underwriter or International Underwriters default in their obligations to
purchase International Securities hereunder and the aggregate number of shares
of International Securities that such defaulting International Underwriter or
International Underwriters agreed but failed to purchase does not exceed 10% of
the total number of shares of International Securities, Salomon International
may make arrangements satisfactory to the Issuer for the purchase of such
International Securities by other persons, including any of the International
Underwriters, but if no such arrangements are made by the Closing Date, the
nondefaulting International Underwriters shall be obligated severally, in
proportion to their respective commitments hereunder, to purchase the
International Securities that such defaulting International Underwriters agreed
but failed to purchase. If any International Underwriter or International
Underwriters so default and the aggregate number of shares of International
Securities with respect to which such default or defaults occur exceeds 10% of
the number of shares of International Securities and arrangements satisfactory
to Salomon International and the Issuer, for the purchase of such International
Securities by other persons are not made within 36 hours after such default,
this Agreement will terminate without liability on the part of any
nondefaulting International Underwriter or the Issuer, except as provided in
Section 9. As used in this Agreement, the term "International Underwriter"
includes any person substituted for an International Underwriter under this
Section. Nothing herein will relieve a defaulting International Underwriter
from liability for its default.

         9. Survival of Certain Representations and Obligations. The respective
indemnities, agreements, representations, warranties and other statements of
the Issuer or its officers or directors and of the several International
Underwriters set forth in or made pursuant to this Agreement will remain in
full force and effect, regardless of any investigation, or statement as to the
results thereof, made by or on behalf of any International Underwriter, the
Issuer or any of the Issuer's representatives, officers or directors or any
controlling person, and will survive delivery of and payment for the


<PAGE>
                                                                             23


International Securities. If for any reason the purchase of the Offered
Securities by the International Underwriter is not consummated, the Issuer
shall remain responsible for the expenses to be paid or reimbursed by them
pursuant to Section 5 (other than with respect to a defaulting International
Underwriter) and the respective obligations of the Issuer and the International
Underwriters pursuant to Section 7 shall remain in effect. If the purchase of
the International Securities by the International Underwriters is not
consummated for any reason other than solely because of the termination of this
Agreement pursuant to Section 8 or solely because of the occurrence of any
event specified in clause (C), (D) or (E) of Section 6(d)(ii), the Issuer will
reimburse the International Underwriters for all out-of-pocket expenses
(including fees and disbursements of counsel) reasonably incurred by them in
connection with the offering of the International Securities.

         10. Notices. All communications hereunder will be in writing and, if
sent to the International Underwriters will be mailed, delivered or telecopied
and confirmed to the International Underwriters, c/o Salomon Brothers
International Limited, 3 Lombard Street, London EC3V 9AA, Attention: Equities
Department or, if sent to the Issuer, will be mailed, delivered or
electronically transmitted and confirmed to it at 230 Park Avenue, New York, NY
10169, Attention: Timothy R. Graham; provided, however, that any notice to an
International Underwriter pursuant to Section 7 will be mailed, delivered or
telecopied and confirmed to such International Underwriter.

         11. Successors. This Agreement will inure to the benefit of and be
binding upon the parties hereto and their respective successors and the
controlling persons referred to in Section 7, and no other person will have any
right or obligation hereunder.

         12. Representation of International Underwriters. Salomon
International will act for the several International Underwriters in connection
with this financing, and any action taken under this Agreement by Salomon
International will be binding upon all the International Underwriters.

         13. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

         14. Applicable Law. This Agreement shall be governed by, and construed
in accordance with, the laws of the State of New York without regard to
principles of conflicts of laws.

         Each of the parties hereby submits to the nonexclusive jurisdiction of
the Federal and state courts in the Borough of Manhattan in The City of New
York in any suit or proceeding arising out of or relating to this Agreement or
the transactions contemplated hereby.


<PAGE>
                                                                             24


         If the foregoing is in accordance with the International Underwriters'
understanding of our agreement, kindly sign and return to us one of the
counterparts hereof, whereupon it will become a binding agreement among the
Issuer and the several International Underwriters in accordance with its terms.

                                     Very truly yours,


                                     WinStar Communications, Inc.


                                     By.........................................
                                       Name:
                                       Title:



The foregoing International Underwriting 
Agreement is hereby confirmed and accepted 
as of the date first above written.

SALOMON BROTHERS INTERNATIONAL LIMITED

By....................................
  Name:
  Title:

Credit Suisse First Boston (Europe) Limited



Each by its duly authorized attorney-in-fact:


 ....................................
Name:


<PAGE>


                                   SCHEDULE A

                                                                Number of
                                                              International
                                                               Securities
International Underwriters                                   to be Purchased
- --------------------------                                   ---------------
Salomon Brothers International  Limited...................

Credit Suisse First Boston (Europe) Limited...............        ----------

Total.....................................................           840,000
                                                                  ==========




                                      A-1


<PAGE>


                                   SCHEDULE B

                                                             Number of
                                                           International
                                                       Securities to be Sold
                                                       ---------------------

WinStar Communications, Inc.......................            840,000


Total.............................................            840,000
                                                              =======




                                      B-1


<PAGE>






                                                           Exhibit A

                                                                         [DATE]

[The undersigned executive officer or director]
WinStar Communications, Inc.
230 Park Avenue
New York, NY 10169

Salomon Smith Barney Inc.
Credit Suisse First Boston Corporation
As Representatives of the Several U.S. Underwriters
   c/o Salomon Smith Barney Inc.
   388 Greenwich Street
   New York, NY 10013

Salomon Brothers International Limited
Credit Suisse First Boston (Europe) Limited
  c/o Salomon Brothers International Limited
  3 Lombard Street
  London EC3V 9AA

Dear Sirs:

         As an inducement to the U.S. Underwriters and the International
Underwriters to execute, respectively, the U.S. Underwriting Agreement and the
International Underwriting Agreement (collectively, the "Underwriting
Agreements"), pursuant to which an offering will be made of the Common Stock,
$0.01 par value per share (the "Securities") of WinStar Communications, Inc.
(the "Issuer"), the undersigned hereby agrees that, for a period of 90 days
after the date of the Underwriting Agreements (the "Applicable Period") to
which you are or expect to become parties, the undersigned will not offer, sell
(except that the undersigned may, with the consent of Salomon Smith Barney Inc.
(which consent shall not be unreasonably withheld), sell securities out of his
customary margin account), contract to sell, pledge or otherwise dispose of,
directly or indirectly, or (except pursuant to agreements executed on or prior
to the date hereof) arrange to have declared effective during the Applicable
Period a registration statement under the Securities Act covering the sale by
the undersigned of (a) any shares of Common Stock of the Issuer or any other
capital stock of the Issuer or (b) any other securities which are convertible
into, or exercisable or exchangeable for, Common Stock or other capital stock
of the Issuer (collectively, "Derivative Securities"), without the prior
written consent of Salomon Smith Barney Inc. (which shall not be unreasonably
withheld), except that the foregoing restrictions shall not apply to (i)
securities transferred by the undersigned in a private transaction where the
transferee receiving such securities agrees to be bound, (ii) the transfer of
no more than 70,000 securities per each of the four inside directors or (iii)
the transfer of no more than 25,000 securities per each of the four independent
directors.

         In furtherance of the foregoing, the Issuer and its transfer agent and
registrar are hereby authorized to decline to make any transfer of shares of
Securities if such transfer would constitute a violation or breach of this
Agreement.

         This Agreement shall be binding on the undersigned and the respective
successors, heirs, personal representatives and assigns of the undersigned.
This Agreement shall lapse and become null and void if the public offering
shall not have occurred on or before the date that is 60 days after the date of
this Agreement.



                                                  Very truly yours,



                                      B-2








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