WINSTAR COMMUNICATIONS INC
424B3, 1997-08-13
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>

    Filed pursuant to Rule 424(b)3 of the Securities Act of 1933, as amended.
Prospectus relates to Registration Statement on Form S-4 (No. 333-26367)
 
                                Offer to Exchange
               14 1/2% Senior Deferred Interest Exchange Notes Due 2005
                   (Interest Payable on April 15 and October 15, 
                            Commencing April 15, 2001)
                                       for
                                 all outstanding 
                  14 1/2% Senior Deferred Interest Notes Due 2005 
                    (Interest Payable on April 15 and October 15, 
                              Commencing April 15, 2001) 
                                         of 
                              WinStar Communications, Inc.
                                 -----------------
 
                                  Offer to Exchange 
             12 1/2% Guaranteed Senior Secured Exchange Notes Due 2004
                (Interest Payable on March 15 and September 15, 
                          Commencing September 15, 1997)
                                        for 
                                  all outstanding 
                   12 1/2% Guaranteed Senior Secured Notes Due 2004 
                    (Interest Payable on March 15 and September 15, 
                            Commencing September 15, 1997) 
                                          of 
                                 WinStar Equipment Corp.
 
                   Unconditionally Guaranteed on a Senior Basis by 
                           WinStar Communications, Inc.
                                 -----------------
                   THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., 
                    NEW YORK CITY TIME ON SEPTEMBER 12, 1997, 
                  UNLESS EXTENDED BY WINSTAR COMMUNICATIONS, INC.
                                 -----------------
    See "Risk Factors" beginning on Page 20 hereof for a discussion of certain 
         information that should be considered in connection with the 
            Exchange Offer and an investment in the Senior Deferred
                Interest Exchange Notes and Guaranteed Senior
                         Secured Exchange Notes.
                                 -----------------
    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
       AND EXCHANGE COMMISSION OR BY ANY STATE SECURITIES COMMISSION NOR
            HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
               SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
                ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION
                      TO THE CONTRARY IS A CRIMINAL OFFENSE.
                                 -----------------
                   The date of this Prospectus is August 11, 1997

<PAGE>

    WinStar Communications, Inc., a Delaware corporation ("Company"), hereby
offers ("Exchange Offer"), upon the terms and subject to the conditions set
forth in this Prospectus and the accompanying letter of transmittal ("Letter of
Transmittal"), to exchange $1,000 principal amount of its 14 1/2% Senior
Deferred Interest Exchange Notes Due 2005 ("New Senior Notes") for each $1,000
principal amount of its outstanding 14 1/2% Senior Deferred Interest Notes Due
2005 ("Old Senior Notes" or "1997 Senior Notes"). The Old Senior Notes and the
New Senior Notes are referred to herein collectively as the "Senior Notes."
 
    As part of the Exchange Offer, WinStar Equipment Corp., a Delaware
corporation and wholly-owned subsidiary of the Company ("WinStar Equipment" and,
together with the Company, the "Issuers"), hereby offers, upon the terms and
subject to the conditions set forth in this Prospectus and the Letter of
Transmittal, to exchange $1,000 principal amount of its 12 1/2% Guaranteed
Senior Secured Exchange Notes Due 2004 ("New Equipment Notes" and, together with
the New Senior Notes, the "New Notes") for each $1,000 principal amount of its
outstanding 12 1/2% Guaranteed Senior Secured Notes Due 2004 ("Old Equipment
Notes" and, together with the Old Senior Notes, the "Old Notes"). The Company,
which has guaranteed the Old Equipment Notes on a senior basis, has agreed to
guarantee the New Equipment Notes on a senior basis ("New Equipment Note
Guarantee"). The Old Equipment Notes and the New Equipment Notes are referred to
herein collectively as the "Equipment Notes."
 
    The New Notes (and the New Equipment Note Guarantee) will be registered
under the Securities Act of 1933, as amended ("Securities Act"), pursuant to the
registration statement on Form S-4 ("Registration Statement") of which this
Prospectus forms a part. As of the date hereof, $100.0 million principal amount
of the Old Senior Notes and $200.0 million principal amount of the Old Equipment
Notes were outstanding. The Registration Statement of which this Prospectus
forms a part has been filed by the Company and WinStar Equipment in accordance
with the terms of the Purchase Agreement, dated March 13, 1997 ("Purchase
Agreement"), and Registration Rights Agreement, dated March 13, 1997
("Registration Agreement"), between the Issuers and Credit Suisse First Boston
Corporation and BT Securities Corporation, the initial purchasers of the Old
Notes ("Initial Purchasers"). The New Notes and Old Notes are referred to herein
collectively as the "1997 Notes" or "Notes." The Exchange Offer is being made by
the Issuers to fulfill certain obligations under the Purchase Agreement and
Registration Agreement. After the consummation of the Exchange Offer, the
Issuers will have no further obligation to make any other such exchange offers.
 
    The Issuers will accept for exchange any and all Old Notes that are validly
tendered and not withdrawn on or prior to 5:00 p.m., New York City time, on the
date the Exchange Offer expires, which will be September 12, 1997, unless the
Exchange Offer is extended by the Company in its sole discretion ("Expiration
Date"). Tenders of Old Notes may be withdrawn at any time prior to 5:00 p.m.,
New York City time, on the Expiration Date. The Exchange Offer is not
conditioned upon any minimum principal amount of Old Notes being tendered for
exchange. However, the Exchange Offer is subject to certain conditions which may
be waived by the Issuers and to the terms and provisions of the Registration
Statement. The Old Notes may be tendered only in denominations of $1,000
principal amount and integral multiples thereof. The Company has agreed to pay
all expenses related to the Exchange Offer, except costs related to the delivery
of the Old Notes by each holder of such notes to the United States Trust Company
of New York, the exchange agent ("Exchange Agent" or "U.S. Trust"), and
underwriting discounts, commissions and transfer taxes. Any waiver, extension or
termination of the Exchange Offer will be publicly announced by the Company
through a release to the Dow Jones News Service and as otherwise required by
applicable laws or regulations. See "The Exchange Offer."
 
    The New Senior Notes and the New Equipment Guarantee will be obligations of
the Company and the New Equipment Notes will be the obligations of WinStar
Equipment. The New Senior Notes will be entitled to the benefits of the
indenture under which the Old Senior Notes were issued (the "Senior Notes
Indenture") and the New Equipment Notes will be entitled to the benefits of the
indenture under which the Old Equipment Notes were issued ("Equipment Notes
Indenture" and, together with the Senior Notes Indenture, the "1997
Indentures"). The form of the New Notes will be identical to the form of the Old
Notes, except that the New Notes will have been registered under the Securities
Act and, therefore, will not bear legends restricting the transfer thereof. The
New Notes will have the same terms, conditions and rankings as the Old Notes.
The New Senior Notes and the New Equipment Note Guarantee will be unsecured,
unsubordinated obligations of the Company, will rank PARI PASSU in right of
payment with all existing and future unsecured, unsubordinated obligations of
the Company and will be senior in 

                                        2
<PAGE>

right of payment to all existing and future subordinated indebtedness of the 
Company. The New Equipment Notes will be secured, senior obligations of 
WinStar Equipment. WEC has no indebtedness senior to the Equipment Notes.
 
    The New Senior Notes will bear interest at a rate of 141/2% per annum,
payable on April 15 and October 15, commencing April 15, 2001. Until October 15,
2000, interest on the New Senior Notes will accrue and be compounded
semiannually on each SemiAnnual Interest Accrual Date (as defined), but will not
be payable in cash. Interest on the Accumulated Amount (as defined) of the New
Senior Notes as of October 15, 2000 will be payable semiannually commencing
April 15, 2001. The New Senior Notes will mature on October 15, 2005 and are
redeemable on or after October 15, 2000, at the option of the Company, in whole
or in part, at the redemption prices set forth herein. The term "(as defined)"
used after a capitalized term means that the term is defined herein under the
section entitled "Description of Notes" or in the 1997 Indentures.

    The New Equipment Notes will bear interest at a rate of 12 1/2% per 
annum, payable on March 15 and September 15, commencing September 15, 1997. 
The New Equipment Notes will mature on March 15, 2004 and are redeemable on 
or after March 15, 2002, at the option of WinStar Equipment, in whole or in 
part, at the redemption prices set forth herein. In the event that by March 
18, 1999, WinStar Equipment has not applied $200.0 million to fund the 
Acquisition Costs (as defined) of Designated Equipment (as defined), WinStar 
Equipment is required to redeem New Equipment Notes in an aggregate principal 
amount equal to such shortfall at a redemption price of 112.50% of such 
principal amount, plus accrued interest, if any, to the date of redemption.

    Based on no-action letters issued by the staff of the Securities and
Exchange Commission ("Commission") to third parties, the Company believes that
New Notes issued pursuant to this Exchange Offer in exchange for Old Notes may
be offered for resale, resold and otherwise transferred by a holder thereof
(other than a broker-dealer who purchased such Old Notes directly from the
Company to resell pursuant to Rule 144A or any other available exemption under
the Securities Act) without compliance with the registration and prospectus
delivery provisions of the Securities Act, provided that the holder is acquiring
the New Notes in the ordinary course of its business and is not participating,
and has no arrangement or understanding with any person to participate, in the
distribution of the New Notes. Holders of Old Notes wishing to accept the
Exchange Offer must represent to the Company in the Letter of Transmittal that
such conditions have been met.

    Each broker-dealer that receives New Notes for its own account pursuant to
the Exchange Offer must acknowledge that it will deliver a prospectus in
connection with any resale of such New Notes. The Letter of Transmittal states
that by so acknowledging and by delivering a prospectus, a broker-dealer will
not be deemed to admit that it is an "underwriter" within the meaning of the
Securities Act. This Prospectus, as it may be amended or supplemented from time
to time, may be used by a broker-dealer in connection with resales of New Notes
received in exchange for Old Notes where such Old Notes were acquired by such
broker-dealer as a result of market-making activities or other trading
activities. The Company has agreed that, for a period of 180 days after the
Expiration Date, it will make this Prospectus available to any broker-dealer for
use in connection with any such resale. See "Plan of Distribution."

    As of July 31, 1997, Cede & Co. ("Cede"), as nominee for The Depository
Trust Company, New York, New York ("DTC"), was the registered holder of $100
million aggregate principal amount of the Old Senior Notes and held such Old
Senior Notes for six of its participants, and was the registered holder of $20
million aggregate principal amount of the Old Equipment Notes and held such Old
Equipment Notes for 21 of its participants. The Company believes that no such
participant is an affiliate (as such term is defined in Rule 405 of the
Securities Act) of the Company or WinStar Equipment. There has previously been
only a limited secondary market, and no public market, for the Old Notes. The
Old Notes are, and the New Notes will be, eligible for trading in the Private
Offering, Resales and Trading through Automatic Linkages ("PORTAL") market.
There can be no assurance as to the liquidity of the trading market for either
the New Notes or the Old Notes. The New Notes constitute securities for which
there is no established trading market, and the Company does not currently
intend to list the Notes on any securities exchange. If such a trading market
develops for the New Notes, future trading prices will depend on many factors,
including, among other things, prevailing interest rates, the Company's results
of operations and the market for similar securities. Depending on such factors,
the New Notes may trade at a discount from their face value. See "Risk
Factors--Absence of Public Market for the New Notes."

                                        3
<PAGE>

    Any Old Notes not tendered and accepted in the Exchange Offer will remain
outstanding and will be entitled to all the rights and preferences and will be
subject to the limitations applicable thereto under the 1997 Indentures.
Following the consummation of the Exchange Offer, the holders of Old Notes will
continue to be subject to the existing restrictions upon transfer thereof and
the Issuers will have no further obligation to such holders to provide for any
other exchange offer with respect to the Old Notes held by such holders.
Following the completion of the Exchange Offer in accordance with the terms
hereof and the Registration Agreement, certain of the Old Notes may not be
entitled to the contingent increase in interest rate as provided in the
Registration Agreement. See "The Exchange Offer."

    This Prospectus, together with the Letter of Transmittal, is being sent to
all registered holders of Old Notes as of August 11, 1997.

    The Issuers will not receive any proceeds from this Exchange Offer. No
dealer-manager is being used in connection with this Exchange Offer. See "Plan
of Distribution."

    THE EXCHANGE OFFER IS NOT BEING MADE TO, NOR WILL THE COMPANY OR WINSTAR
EQUIPMENT ACCEPT SURRENDERS FOR EXCHANGE FROM, HOLDERS OF OLD NOTES IN ANY
JURISDICTION IN WHICH THE EXCHANGE OFFER OR THE ACCEPTANCE THEREOF WOULD NOT BE
IN COMPLIANCE WITH THE SECURITIES OR BLUE SKY LAWS OF SUCH JURISDICTION.

    The Old Notes were issued originally in global form (the "Old Global
Notes"). The Old Global Notes were deposited with, or on behalf of, DTC, as the
initial depository with respect to the Old Notes (in such capacity, the
"Depository"). The Old Global Notes are registered in the name of Cede, as
nominee of DTC, and beneficial interests in the Old Global Notes are shown on,
and transfers thereof are effected only through, records maintained by the
Depository and its participants. The use of the Old Global Notes to represent
the Old Notes permits the Depository's participants, and anyone holding a
beneficial interest in an Old Note registered in the name of such a participant,
to transfer interests in the Old Notes electronically in accordance with the
Depository's established procedures without the need to transfer a physical
certificate. Except as provided below, the New Notes will also be issued
initially as a note in global form (the "New Global Notes", and together with
the Old Global Notes, the "Global Notes") and deposited with, or on behalf of,
the Depository. Notwithstanding the foregoing, holders of Old Notes that are
held, at any time, by a person that is not a qualified institutional buyer under
Rule 144A (a "Qualified Institutional Buyer") and exchanges Old Notes in the
Exchange Offer, will receive the New Notes in certificated form and is not, and
will not be, able to trade such securities through the Depository unless the New
Notes are resold to a Qualified Institutional Buyer. After the initial issuance
of the New Global Notes, New Notes in certificated form will be issued in
exchange for a holder's proportionate interest in the New Global Notes only as
set forth in the Indenture.

    No person has been authorized to give any information or to make any
representations in connection with the Exchange Offer other than those contained
in this Prospectus and the Letter of Transmittal and, if given or made, such
information or representation must not be relied upon as having been authorized
by the Company or the Exchange Agent. This Prospectus does not constitute an
offer to sell or a solicitation of an offer to buy the New Notes in any
jurisdiction to any person to whom it is unlawful to make such offer or
solicitation in such jurisdiction. The delivery of this Prospectus shall not,
under any circumstances, create any implication that the information herein is
correct at any time subsequent to its date.

                                        4

<PAGE>

 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                      PAGE                                                         PAGE
                                                      -----                   
<S>                                                <C>          <C>                                                <C>
Available Information............................       5   Certain United States Federal
Incorporation of Information by Reference........       6   Income Tax Considerations........................       67
Prospectus Summary...............................       7   Description of Certain Indebtedness
Risk Factors.....................................      20   and Preferred Stock..............................       72
The Exchange Offer...............................      32   Plan of Distribution.............................       76
Capitalization...................................      39   Legal Matters....................................       76
Description of Notes.............................      40   Experts..........................................       76
</TABLE>

                             AVAILABLE INFORMATION

    The Company has filed with the Commission a Registration Statement on 
Form S-4 under the Securities Act with respect to the New Notes offered in 
the Exchange Offer. For the purposes hereof, the term "Registration 
Statement" means the original Registration Statement and any and all 
amendments thereto. In accordance with the rules and regulations of the 
Commission, this Prospectus does not contain all of the information set forth 
in the Registration Statement and the schedules and exhibits thereto. Each 
statement made in this Prospectus concerning a document filed as an exhibit 
to the Registration Statement is qualified in its entirety by reference to 
such exhibit for a complete statement of its provisions. For further 
information pertaining to Company and the New Notes offered in the Exchange 
Offer, reference is made to such Registration Statement, including the 
exhibits and schedules thereto and the financial statements, notes and 
schedules filed as a part thereof. The Registration Statement (and the 
exhibits and schedules thereto) may be inspected and copied at the public 
reference facilities maintained by the Commission at its principal office at 
Judiciary Plaza, 450 Fifth Street, N.W., Room 1024, Washington, D.C. 20549 
("Washington Office"), or at its regional offices at Citicorp Center, 500 
West Madison Street, 14th Floor, Chicago, Illinois 60661 ("Chicago Office"), 
and at Seven World Trade Center, 13th Floor, New York, New York 10048 ("New 
York Office"). Any interested party may obtain copies of all or any portion 
of the Registration Statement and the exhibits thereto at prescribed rates 
from the Public Reference Section of the Commission at its Washington Office. 
Additionally, the Commission maintains a web site (http:// www.sec.gov) that 
contains certain reports, proxy and information statements and other 
information relating to the Company.

    The Company is subject to the informational requirements of the 
Securities Exchange Act of 1934, as amended ("Exchange Act"), and in 
accordance with the Exchange Act, the Company files periodic reports, proxy 
statements and other information with the Commission. Such reports, proxy 
statements and other information filed by the Company with the Commission can 
be inspected and copied (at prescribed rates) at the Commission's Washington 
Office, Chicago Office and New York Office. In addition, reports, proxy 
statements and other information concerning the Company can be inspected and 
copied at the offices of The Nasdaq Stock Market, Inc., 1735 K Street, N.W., 
Washington, D.C. 20006.

    If the Company ceases to be subject to the informational reporting 
requirements of the Exchange Act, the Company has agreed that, so long as any 
Notes are outstanding, it will file with the Commission all such reports and 
other information as it would be required to file with the Commission by 
Sections 13(a) or 15(d) under the Exchange Act. The Company will supply the 
Trustee and each holder of Notes, or will supply to the Trustee for 
forwarding to each such holder, without cost to such holder, copies of such 
reports or other information.

                                 5

<PAGE>

                  INCORPORATION OF INFORMATION BY REFERENCE

    The following documents or information have been filed by the Company with
the Commission pursuant to the Exchange Act and are incorporated herein by
reference:

        (1) Annual Report on Form 10-K for the year ended December 31, 1996;

        (2) Current Report on Form 8-K filed January 17, 1997.

        (3) Current Report on Form 8-K filed February 14, 1997.

        (4) Current Report on Form 8-K filed February 27, 1997.

        (5) Current Report on Form 8-K filed March 27, 1997;

        (6) Quarterly Report on Form 10-Q for the three-month period ended March
            31, 1997, as amended on June 10, 1997;

        (7) Proxy Statement, dated May 15, 1997;

        (8) Current Report on Form 8-K filed June 10, 1997; and

        (9) Current Report on Form 8-K filed July 2, 1997.

    All documents subsequently filed by the Company with the Commission 
pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the 
date of this Prospectus and prior to the termination of the offering covered 
by this Prospectus shall be deemed incorporated by reference into this 
Prospectus and to be a part hereof from the date of filing of such documents. 
Any statement contained in a document incorporated by reference herein shall 
be deemed to be modified or superseded for purposes of this Prospectus to the 
extent that a statement contained herein modifies or supersedes such 
statement. Any statement so modified or superseded shall not be deemed, 
except as so modified or superseded, to constitute a part of this Prospectus.

    The Company hereby undertakes to provide without charge to each person to 
whom a copy of this Prospectus has been delivered, upon the written or oral 
request of such person to WinStar Communications, Inc., 230 Park Avenue, 
Suite 2700, New York, New York 10169 (telephone 212-584-4000), Attention: 
Investor Relations, a copy of any and all of the documents referred to above 
(other than exhibits to such documents) which have been incorporated by 
reference in this Prospectus. All such documents can also be retrieved from 
the Commission's electronic data gathering and retrieval (EDGAR) system at 
www.sec.gov.

                                   6

<PAGE>

                              PROSPECTUS SUMMARY

    This summary is qualified in its entirety by the detailed information and 
financial statements and notes thereto appearing elsewhere or incorporated by 
reference in this Prospectus. Unless otherwise indicated, references herein 
to the "Company" or "WinStar" refer to WinStar Communications, Inc. and, 
where appropriate, its subsidiaries. Effective January 1, 1996, the Company 
changed its fiscal year end from the last day in February to December 31. 
Wireless FiberSM is a service mark and WinStar-Registered Trademark- is a 
trademark of WinStar Communications, Inc.

                                 The Company

    The Company provides a full range of telecommunications services, 
including local, long distance and Internet access services, as a competitive 
local exchange carrier ("CLEC"). By exploiting its fiber-quality digital 
capacity in the 38 GHz portion of the radio spectrum ("Wireless Fiber") and a 
switch-based infrastructure, the Company seeks to distinguish itself as a 
facilities-based, value-added provider of high-capacity telecommunications 
services to small and medium-sized businesses and an attractive alternative 
to established providers, such as the regional Bell operating companies 
("RBOCs"). The Company introduced its switch-based local exchange services to 
end users in New York City in October 1996, is currently also offering local 
exchange service on a switched basis and a resale basis in Boston, Chicago, 
Los Angeles and San Diego and offering local exchange services on a resale 
basis only in Atlanta, Dallas, Hartford, Milwaukee, Newark, Orange County 
(California), Philadelphia, San Francisco, Stamford (Connecticut) and 
Washington, D.C. The Company's local exchange services include the provision 
of PBX trunks, individual business lines and Centrex and Internet access, and 
provide customers with full-feature services such as custom calling, caller 
ID, conference calling and voice mail. During the next several years, the 
Company intends to introduce its local exchange services in each of the other 
major metropolitan areas where it is licensed to provide 38 GHz services over 
four or more 100 MHZ channels. Over time, the Company intends to carry a 
substantial majority of its local telecommunications service traffic 
utilizing Wireless Fiber and its own switched networks, unlike most 
fiber-based CLECs, which typically do not carry the majority of their 
customer traffic over their own networks. The Company also offers a variety 
of facilities-based broadband, high-capacity local access and digital network 
services ("Carrier Services") to other telecommunications service providers 
on a wholesale basis. As of June 30, 1997, the Company had more than 40 
carrier customers, including, among others, Ameritech Cellular Services, MCI 
Communications, Pacific Bell and Teleport Communications Group.

    The Company is the holder of the largest amount of 38 GHz spectrum in the 
United States and is utilizing this asset to build local telephone networks 
for the transmission of voice, data and video traffic in the major 
metropolitan areas covered by the Company's 38 GHz licenses (the "Wireless 
Licenses"). The Wireless Licenses cover an aggregate of more than 100 cities 
with populations exceeding 100,000 each, and encompass an aggregate 
population of approximately 172 million. Furthermore, the Wireless Licenses 
allow the Company to provide Wireless Fiber services in 49 of the 50 most 
populated Metropolitan Statistical Areas ("MSAs") in the United States. The 
Company has agreed to acquire an aggregate of 62 additional 38 GHz licenses 
in various transactions, subject to approval by the Federal Communications 
Commission ("FCC"). Upon completion of these acquisitions, the Company's 
Wireless Licenses will enable the Company to provide services in all of the 
50 most populated MSAs and will cover cities encompassing an aggregate 
population of over 180 million. The Company holds one or more Wireless 
Licenses in numerous markets which allow it to provide Wireless Fiber 
services over four or more channels in such market. The Company believes that 
the utilization of multiple 38 GHz channels in a single licensed area 
provides it with advantages over 38 GHz service providers that possess fewer 
channels, by allowing it to build out city-wide networks of broadband 
capacity.

    The 38 GHz portion of the radio spectrum has characteristics well suited 
for the provision of local telecommunications services, including:

    Rapid Deployment of Alternative Local Infrastructure. 38 GHz technology 
generally can be deployed considerably more rapidly than wireline (because of 
permit procedures and construction time required for wireline buildout) and 
many other wireless technologies (because of their infrastructure 
requirements and, in many instances, the need to follow FCC frequency 
coordination procedures in connection with wireless facilities).

    Broad Bandwidth.  The total amount of bandwidth for each 38 GHz channel 
is 100 MHz, which supports full broadband capability. For example, one 38 100 
MHz GHz channel can support transmission capacity of one DS-3 at 45 Mbps 
which can transfer data at a rate that is 

                                 7

<PAGE>

over 1,500 times the rate of the fastest dial-up modem currently in general 
use (28.8 Kbps) and over 350 times the rate of the fastest ISDN line 
currently in general use (128 Kbps). Data transfer rates of a 38 GHz DS-3 
channel even exceed the data transfer rates of cable modems (30 Mbps). The 
broadband capacity of 38 GHz provides improved speed and quality in 
transmissions, as compared to transmissions that are carried over a "last 
mile" consisting of copper wire. In addition to accommodating standard voice 
and data requirements, 45 Mbps data transmission rates allow end users to 
receive full-motion video and 3-D graphics and to use highly interactive 
applications on the Internet and other networks.

    Ease of Installation.  The equipment used for point-to-point applications 
in 38 GHz (i.e., antennae, transceivers and digital interface units) is 
typically smaller, less obtrusive, less expensive, and uses less power than 
equipment used for similar applications at lower frequencies. These 
characteristics make it relatively easier to obtain the roof rights ("Roof 
Rights") required to install 38 GHz transceivers, and less costly to initiate 
38 GHz-based services as compared to most other wireless services.

    Efficient Channel Reuse.  Certain characteristics of 38 GHz, including the
effective range of its radio signal and the small amount of dispersion (i.e.,
scattering) of the radio beam as compared to the more dispersed radio beams
produced at lower frequencies, allow for the reuse of bandwidth capacity in a
licensed area. The ability to reuse capacity allows the 38 GHz license holder to
densely deploy its 38 GHz services in a given geographic area, provide services
to multiple customers over the same 38 GHz channel, and conserve bandwidth
capacity, thereby enhancing the types of services that can be provided and
increasing the number of customers to which such services can be provided.

Business Strategy

    The Company's objective is to become the full-service telecommunications 
provider of choice to small and medium-sized business customers and a 
provider of high-quality alternative and broadband facilities to its Carrier 
Services customers. Key elements of the Company's strategy are to:

    Expand Network Infrastructure.  The Company is creating an infrastructure 
on a city-by-city basis using its Wireless Fiber capabilities, switches and 
other telecommunications equipment acquired by the Company from equipment 
vendors and facilities leased from other carriers to originate and terminate 
traffic. Pursuant to its building-centric network plan, the Company is 
identifying strategically located sites in each metropolitan area where it 
provides service to serve as hubs for its network in that metropolitan area. 
These hub sites will be connected via Wireless Fiber links to end users. The 
Company believes that a limited number of hub sites (generally less than a 
dozen) in each metropolitan area will allow it to address more than 70% of 
its targeted buildings and to carry the majority of its customers' traffic on 
its own network instead of the higher cost facilities of other carriers.

    Exploit First-to-Market Advantages. The Company seeks to capitalize on 
the significant opportunities emerging in the industry as a result of the 
Telecommunications Act of 1996 (the "Telecommunications Act") by exploiting a 
"first-to-market" advantage as one of the few holders of 38 GHz licenses with 
an established operating and management infrastructure. The Company believes 
that its early entrance into its markets provides it with advantages over 
many potential competitors by allowing it to: (i) establish a customer base 
prior to widespread competition from other CLECs; (ii) develop a proven, 
reliable network infrastructure using its own switching and transmission 
capabilities ahead of many other CLECs; (iii) develop pioneering expertise in 
the utilization of 38 GHz for the delivery of telecommunications and 
multimedia services and the design and management of 38 GHz-based networks; 
and (iv) acquire Roof Rights to place its 38 GHz antennae on a large number 
of buildings on favorable terms and in advance of other wireless service 
providers.

    Focus on Small and Medium-Sized Business Customers. The Company believes 
there exists a substantial opportunity to attract a base of small and 
medium-sized business customers by providing superior customer service and 
sales support. The customer base initially targeted by the Company consists 
of businesses typically located in buildings that have more than 100,000 
square feet of commercial space and which, in many instances, are not served 
by fiber facilities provided by CLECs or competitive access providers 
("CAPs"). The Company estimates that there are more than 8,000 buildings in 
this target group, populated by approximately 9.7 million workers using more 
than 2.1 million phone lines. Over time, the Company intends to expand its 
target customer base to include the majority of small and

                                8

<PAGE>

medium-sized businesses in the metropolitan areas covered by the Wireless 
Licenses, which the Company estimates contain approximately 60% of all such 
businesses in the United States and represent a market opportunity in excess 
of $30 billion per year.

    Market Wireless Fiber to Other Carriers.  The Company markets its Carrier 
Services to other carriers such as the RBOCs and other local exchange 
carriers ("LECs"), interexchange carriers ("IXCs"), other CAPs and CLECs, 
providers of personal communications services ("PCS") and cellular and 
specialized mobile radio services ("CMRS") providers. The Company believes 
that its Carrier Services present an attractive, economical method for 
telecommunications service providers to add a high-capacity extension to 
their own networks and service territories, especially as they seek to 
rapidly penetrate new markets opening as a result of the Telecommunications 
Act. The Company's Carrier Services can also provide cost-efficient route 
diversity where network reliability concerns require multiple 
telecommunications paths.

    Since the commercial introduction of the Company's Carrier Services in 
October 1995, the number of carrier customers has increased significantly. 
Such customers include Ameritech Cellular Services, AT&T Wireless, Bell 
Atlantic/NYNEX Mobile, Brooks Fiber, Cellular One, PrimeCo Personal 
Communications, Siemens Stromberg-Carlson, Teleport Communications Group and 
Western Wireless. In addition, the Company has entered into multi-year master 
service agreements with American Communications Services, Electric Lightwave, 
IntelCom, MCI Communications and Pacific Bell. These agreements establish the 
framework under which such companies may effect the integration of Wireless 
Fiber services into their own telecommunications networks. The Company is in 
the process of negotiating additional master service agreements with other 
large telecommunications providers and has offered to enter into co-exclusive 
multi-region network usage agreements with one or more such providers.

    Market Wireless Fiber Services as a Solution to Growing Capacity 
Shortages. The Company believes that demand for its Wireless Fiber-based CLEC 
and Carrier Services will grow because of the expanding volume of data 
communications traffic resulting from increasing Internet usage and other 
high-volume data transmission requirements. This type of traffic increasingly 
requires high-capacity, end-to-end networks that are often difficult to 
provide economically with older RBOC and LEC infrastructure.

    Provide Information and Content Services.  The Company believes that the 
ability to deliver information and other content will become an increasingly 
important factor in the choice of a telecommunications provider by businesses 
as competition increases and the markets covered by the Wireless Licenses 
mature. Accordingly, the Company actively seeks opportunities to utilize its 
information and content assets and services to enhance the marketability of 
the Company's telecommunications services.

Development of Core Assets

    The Company believes that in order to effectively compete with incumbent 
LECs and other telecommunications service providers in its target markets, it 
must develop a core group of assets, capabilities and resources. The Company 
has made substantial progress in acquiring and developing these core assets, 
which include:

    Transmission and Switching Facilities.  In October 1996, the Company 
initiated local switched services in New York City, utilizing its first 5ESS 
switch, purchased from Lucent Technologies, Inc. ("Lucent"), and facilities 
leased from NYNEX. Since that time, the Company has initiated local switched 
services in Boston, Chicago, Los Angeles and San Diego. During the next three 
years, the Company intends to install Lucent switches to serve most of its 
major markets. The Company has the necessary Roof Rights to install its 
Wireless Fiber transmission facilities on approximately 1,400 buildings in 
its licensed areas. The Company also has developed business and operational 
support and network monitoring and management systems that will ensure the 
efficient use of its networks and provide network reliability and 
transmission quality equivalent to that provided by fiber-optic networks. The 
Company maintains a network operations center ("NOC"), which is operating 24 
hours a day, 7 days a week, and is currently building a national field 
service force.

    State Authorizations.  The Company has obtained authorization to operate 
as a CLEC in 24 states and the District of Columbia and is in the process of 
seeking authorization to operate as a CLEC in a number of additional 
jurisdictions. The Company is authorized to provide its local access and 
other Carrier Services as a CAP in 34 states 

                                9

<PAGE>

and the District of Columbia and has applications pending for such 
authorizations in a number of additional jurisdictions.

    Sales and Customer Support Organizations.  The Company is expending a 
significant amount of time and capital to build a dedicated, responsive sales 
and customer support organization in order to ensure that the people and 
systems necessary to achieve customer satisfaction keep pace with a growing 
customer base. The Company has a direct sales organization for its CLEC 
services, currently consisting of more than 285 people located in 15 major 
markets, and a Carrier Services sales group, currently consisting of more 
than 70 people.

    Information Systems.  The Company is investing significant capital
developing state-of-the-art information systems platforms directed toward the
accurate and flexible handling of the billing and customer satisfaction
requirements of a diverse customer base purchasing a variety of
telecommunications services. The Company believes that its information systems
allow it to provide customers with a level of service and responsiveness that
many other telecommunications service providers do not offer and that such level
of service will become a key factor in customers' choice of telecommunications
service providers as the market matures.

    Experienced Management and Operating Personnel.  The Company has assembled a
management team and hired operating personnel experienced in all areas of
telecommunications operations, including more than 250 former officers and
employees of MCI Communications and Sprint Corporation, as well as officers and
employees from other established telecommunications companies. The Company plans
to hire additional experienced telecommunications marketing and operations
personnel as appropriate.

Winstar Equipment

    WinStar Equipment is a recently organized, wholly owned subsidiary of the 
Company established to facilitate the financing and purchase of 
telecommunications equipment and inventory ("Designated Equipment"), 
including radios, antennae, switches, cable, service vehicles and related 
equipment and software, used in the Company's businesses and for the buildout 
of its telecommunications operations. WinStar Equipment will use the proceeds 
of the Equipment Notes Offering (as defined) to purchase Designated Equipment 
which it will, in turn, lease in connection with the furtherance of the 
Company's telecommunications business.

    In July 1997, counsel for the Company delivered to the Commission a 
letter ("No-Action Letter") asking the Commission to confirm that it would 
not raise any objection if the Company does not include separate financial 
statements of WinStar Equipment but rather, provides summarized financial 
information regarding WinStar Equipment in the Company's periodic reports 
filed pursuant to the Exchange Act. In addition, the No-Action Letter 
requests that the Commission agree that it will not raise any objection if 
WinStar Equipment does not comply with the periodic reporting requirements of 
Sections 13 or 15(d) of the Exchange Act. The Company believes that its 
position with respect to financial information of WinStar Equipment is 
appropriate because: (i) WinStar Equipment does not and will not generate any 
revenue other than lease payments it receives from the lessees of equipment, 
which payments WinStar Equipment will in turn apply to service the debt 
evidenced by the Equipment Notes; (ii) WinStar Equipment has no operating 
history and no assets other than cash and cash equivalents, the Designated 
Equipment it has already purchased with the proceeds of the Equipment Notes, 
and the Designated Equipment it will purchase in the future until the 
proceeds from the Equipment Notes are exhausted; (iii) the Company is the 
sole shareholder of WinStar Equipment, which currently has no employees; (iv) 
each of WinStar Equipment's officers and directors is also an employee of the 
Company; and (v) Win Star Equipment has no independent operations other than 
to function as a telecommunications equipment leasing company serving 
primarily WinStar and its telecommunications businesses.

Other Businesses

    The Company has historically generated a significant portion of its 
revenues from the resale of long distance services to residential customers. 
As part of its CLEC service offerings, the Company is focusing on the sale of 
long distance services to small and medium-sized businesses and is not 
currently marketing such services to residential customers on an active basis.

                                 10

<PAGE>

    Prior to the Company's entry into the telecommunications industry, it 
marketed and distributed consumer products, including personal care and bath 
and beauty products, through a nonstrategic subsidiary. That subsidiary 
continues to sell such products, primarily to large retailers, mass 
merchandisers, discount stores, department stores, national and regional drug 
store chains and other regional retail chains. The Company expects to divest 
itself of this subsidiary during the next 9 to 12 months.

Corporate Information

    The Company and WinStar Equipment were incorporated under the laws of the 
State of Delaware in September 1990 and February 1997, respectively, and 
their principal offices are located at 230 Park Avenue, New York, New York 
10169. Their phone number is (212) 584-4000.

                                    11

<PAGE>

                    Summary of the Exchange Offer

Background--the Private Offering of Debt Securities
 
<TABLE>

<S>                                            <C>
General......................................  In March 1997, the Company sold an aggregate
                                               of $100.0 million principal amount of Old
                                               Senior Notes and WinStar Equipment sold an
                                               aggregate of $200.0 million principal amount
                                               of Old Equipment Notes in an institutional
                                               private placement ("1997 Debt Placement") to
                                               the initial purchasers ("Initial
                                               Purchasers"). The principal purpose of the
                                               1997 Debt Placement was to raise proceeds to
                                               fund the expansion of the Company's Wireless
                                               Fiber services and the general development
                                               and growth of the Company's
                                               telecommunications operations.

Exchange of Old Notes........................  Pursuant to the Registration Agreement, the
                                               Company is obligated to consummate the
                                               Exchange Offer with respect to the Old Senior
                                               Notes and WinStar Equipment is obligated to
                                               consummate the Exchange Offer with respect to
                                               the Old Equipment Notes pursuant to the
                                               Registration Statement of which this
                                               Prospectus forms a part or, if required in
                                               lieu thereof, cause the Old Senior Notes or
                                               Old Equipment Notes, as the case may be, to
                                               be registered under the Securities Act
                                               pursuant to a shelf registration statement.
                                               If (i) by September 15, 1997, neither the
                                               Exchange Offer is consummated nor the shelf
                                               registration statement is declared effective;
                                               or (ii) after either the Registration
                                               Statement of which this Prospectus forms a
                                               part (or the shelf registration statement) is
                                               declared effective, such registration
                                               statement thereafter ceases to be effective
                                               or usable (subject to certain exceptions) in
                                               connection with resales of the Old Notes or
                                               the applicable New Notes in accordance with
                                               and during the periods specified in the
                                               Registration Agreement (each such event
                                               referred to in clauses (i) and (ii) a
                                               "Registration Default"), additional interest
                                               of 0.50% will accrue on such Notes from and
                                               including the date on which any such
                                               Registration Default shall occur, but
                                               excluding the date on which all Registration
                                               Defaults have been cured.

Terms of the Exchange Offer

The Exchange Offer...........................  Pursuant to the Exchange Offer, $1,000
                                               principal amount of New Notes will be issued
                                               in exchange for each $1,000 principal amount
                                               of outstanding Old Notes validly tendered and
                                               not withdrawn. The New Notes will be issued
                                               to tendering holders of Old Notes as promptly
                                               as practicable after the Expiration Date.

Resale.......................................  Based on an interpretation by the staff of
                                               the Commission set forth in no-action letters
                                               issued to third parties, the Issuers believe
                                               that the New Notes issued pursuant to the
                                               Exchange Offer in exchange for Old Notes may
                                               be offered for resale, resold and otherwise
                                               transferred by any holder thereof (other than
                                               broker-dealers, as set forth below) without
                                               compliance with the registration and
                                               prospectus delivery provisions of the
                                               Securities Act, provided that such New Notes
                                               are acquired in the ordinary course of such
                                               holder's business and that such holder has no
                                               arrangement or understanding with any person
                                               to participate in the distribution of such
                                               New Notes. Each broker-dealer that receives
                                               New Notes for its own account in exchange for
                                               Old Notes that were acquired as a result of
                                               market-making or other trading activity must
                                               acknowledge that it will deliver a prospectus
                                               in connection with any resale of New 

</TABLE>

                                   12


<PAGE>

<TABLE>
<S>                                            <C>
                                               Notes. The Letter of Transmittal states that 
                                               by so acknowledging and delivering a prospectus,
                                               such broker-dealer will not be deemed to
                                               admit that it is an "underwriter" within the
                                               meaning of the Securities Act. This
                                               Prospectus, as it may be amended or
                                               supplemented from time to time, may be used
                                               by such broker-dealer in connection with
                                               resales of New Notes received in exchange for
                                               Old Notes where such New Notes were acquired
                                               by such broker-dealer as a result of
                                               market-making activities or other trading
                                               activities. Each of the Company and WinStar
                                               Equipment has agreed that, for a period of
                                               180 days after the Expiration Date, it will
                                               make this Prospectus available to any such
                                               broker-dealer for use in connection with any
                                               such resale. See "Plan of Distribution." Any
                                               holder who tenders in the Exchange Offer with
                                               the intention to participate, or for the
                                               purpose of participating, in a distribution
                                               of the New Notes may not rely on the
                                               foregoing position of the staff of the
                                               Commission and, in the absence of an
                                               exemption therefrom, must comply with the
                                               registration and prospectus delivery
                                               requirements of the Securities Act in
                                               connection with a secondary resale
                                               transaction. Failure to comply with such
                                               requirements in such instance may result in
                                               such holder incurring liabilities under the
                                               Securities Act for which the holder is not
                                               indemnified by the Company.

                                               The Exchange Offer is not being made to, nor
                                               will be accepted from, holders of Old Notes
                                               in any jurisdiction in which this Exchange
                                               Offer or the acceptance thereof would not be
                                               in compliance with the securities laws of
                                               such jurisdiction.

Expiration Date..............................  5:00 p.m., New York City time, September 12,
                                               1997, unless the Exchange Offer is extended,
                                               in which case the term "Expiration Date"
                                               means the latest date and time to which the
                                               Exchange Offer is extended. Any extension, if
                                               made, will be publicly announced through a
                                               release to the Dow Jones News Service and as
                                               otherwise required by applicable law or
                                               regulations. The Company may extend the
                                               Expiration Date in its sole and absolute
                                               discretion.

Conditions to the Exchange Offer.............  The Exchange Offer is not subject to any
                                               conditions, other than that the Exchange
                                               Offer does not violate applicable law or any
                                               applicable interpretation of the staff of the
                                               Commission. See "The Exchange Offer --
                                               Conditions to the Exchange Offer." The
                                               Exchange Offer is not conditioned upon any
                                               minimum principal amount of Old Notes being
                                               tendered.

Procedures for Tendering Old Notes...........  Each holder of Old Notes wishing to accept
                                               the Exchange Offer must complete, sign and
                                               date the Letter of Transmittal, or a
                                               facsimile thereof, in accordance with the
                                               instructions contained herein and therein,
                                               and mail or otherwise deliver the Letter of
                                               Transmittal, or a facsimile thereof, together
                                               with the Old Notes to be exchanged and any
                                               other required documentation to U.S. Trust,
                                               as Exchange Agent, at the address set forth
                                               herein and therein. By executing a Letter of
                                               Transmittal, each holder will represent to
                                               the Company that, among other things, the New
                                               Notes acquired pursuant to the Exchange Offer
                                               are being obtained in the ordinary course of
                                               business of the person receiving such New
                                               Notes, whether or not such person is the
                                               holder, and that neither the holder nor 

</TABLE>

                                    13

<PAGE>

<TABLE>
<S>                                            <C>

                                               any such other person has any arrangement or
                                               understanding with any person to participate
                                               in the distribution of such New Notes.

Special Procedures for Beneficial Owners.....  Any beneficial owner whose Old Notes are
                                               registered in the name of a broker,
                                               commercial bank, trust company or other
                                               nominee, and who wishes to tender in the
                                               Exchange Offer should contact such registered
                                               holder promptly and instruct such registered
                                               holder to tender on such beneficial owner's
                                               behalf. If such beneficial owner wishes to
                                               tender on his own behalf, such beneficial
                                               owner must, prior to completing and executing
                                               the Letter of Transmittal and delivering his
                                               Old Notes, either make appropriate
                                               arrangements to register ownership of the Old
                                               Notes in such owner's name or obtain a
                                               properly completed bond power from the
                                               registered holder. Beneficial owners should
                                               be aware that the transfer of registered
                                               ownership may take considerable time and may
                                               not be able to be completed prior to the
                                               Expiration Date.

Guaranteed Delivery Procedures...............  Holders of Old Notes who wish to tender such
                                               Old Notes and whose Old Notes are not
                                               immediately available or who cannot deliver
                                               their Old Notes and a properly completed
                                               Letter of Transmittal or any other documents
                                               required by the Letter of Transmittal to the
                                               Exchange Agent prior to the Expiration Date
                                               may tender their Old Notes according to the
                                               guaranteed delivery procedures set forth in
                                               "The Exchange Offer -- Procedures for
                                               Tendering."

Acceptance of Old Notes and Delivery of New    Subject to certain conditions (as described
  Notes......................................  more fully in "The Exchange Offer --
                                               Conditions to the Exchange Offer"), the
                                               Company and WinStar Equipment, as the case
                                               may be, will accept for exchange any and all
                                               Old Notes which are properly tendered in the
                                               Exchange Offer and not withdrawn, prior to
                                               5:00 p.m., New York City time, on the
                                               Expiration Date. The New Notes issued
                                               pursuant to the Exchange Offer will be
                                               delivered as promptly as practicable
                                               following the Expiration Date.

Withdrawal Rights............................  Subject to the conditions set forth herein,
                                               tenders of Old Notes may be withdrawn at any
                                               time prior to 5:00 p.m., New York City time
                                               on the Expiration Date. See "The Exchange
                                               Offer -- Withdrawal of Tenders."

Certain Federal Income Tax Considerations....  The exchange pursuant to the Exchange Offer
                                               should not constitute a taxable exchange for
                                               federal income tax purposes. Each New Note
                                               should be treated as having been originally
                                               issued at the time the Old Note exchange
                                               therefor was originally issued. However,
                                               holders should consult their own tax
                                               advisors. See "Certain United States Federal
                                               Income Tax Considerations."

Exchange Agent...............................  U.S. Trust, the Trustee under the Indentures,
                                               is serving as Exchange Agent in connection
                                               with the Exchange Offer. For information with
                                               respect to the Exchange Offer, the telephone
                                               number for the Exchange Agent is (212)
                                               852-1000 and the facsimile number for the
                                               Exchange Agent is (212) 852-1625.
</TABLE>

   See "The Exchange Offer," below, for more detailed information concerning
the terms of the Exchange Offer.

                                  14

<PAGE>

                             The New Notes

    The Exchange Offer applies to $100.0 million aggregate principal amount 
of Old Senior Notes and $200.0 million principal amount of Old Equipment 
Notes. The form and terms of the New Notes will be the same as the form and 
terms of the Old Notes, except that the New Notes will be registered under 
the Securities Act and, therefore, will not bear legends restricting the 
transfer thereof. The New Notes will evidence the same debt as the Old Notes 
and the New Senior Notes and New Equipment Notes will be entitled to the 
benefits of the Senior Notes Indenture and Equipment Notes Indenture, 
respectively. Upon consummation of the Exchange Offer, the New Senior Notes 
will be treated as a single class with any Old Senior Notes, and the New 
Equipment Notes will be treated as a single class with any Old Equipment 
Notes, that remain outstanding. Upon consummation of the Exchange Offer, the 
Old Notes will not be entitled to certain registration rights under the 
Registration Agreement. See "Description of Notes."



<TABLE>
<S>                                              <C>
Securities Offered

  New Senior Notes.............................  $100,000,000 principal amount of 14 1/2%
                                                 Senior Deferred Interest Exchange Notes Due
                                                 2005 of the Company.

  New Equipment Notes..........................  $200,000,000 principal amount of 12 1/2%
                                                 Guaranteed Senior Secured Exchange Notes Due
                                                 2004 of WinStar Equipment.

Maturity Date

  New Senior Notes.............................  October 15, 2005.

  New Equipment Notes..........................  March 15, 2004.

Interest Payment Dates

  New Senior Notes.............................  April 15 and October 15, commencing April 15,
                                                 2001. Until October 15, 2000, interest on the
                                                 New Senior Notes will accrue at a rate of
                                                 14 1/2% per annum and be compounded
                                                 semiannually on each SemiAnnual Interest
                                                 Accrual Date, but, other than additional
                                                 interest payable upon any Registration
                                                 Default, will not be payable in cash.
                                                 Interest on the Accumulated Amount of the New
                                                 Senior Notes as of October 15, 2000 will be
                                                 payable semiannually in cash, commencing
                                                 April 15, 2001. For a discussion of the
                                                 federal income tax treatment of the New
                                                 Senior Notes under the original issue
                                                 discount rules, see "Certain United States
                                                 Federal Income Tax Considerations."

  New Equipment Notes..........................  March 15 and September 15, commencing
                                                 September 15, 1997.

Optional Redemption

  New Senior Notes.............................  The New Senior Notes will not be redeemable
                                                 prior to October 15, 2000. Thereafter, the
                                                 New Senior Notes will be redeemable at the
                                                 option of the Company, in whole or in part,
                                                 at the redemption prices set forth herein
                                                 plus accrued interest, if any, on the
                                                 Accumulated Amount of the New Senior Notes to
                                                 the date of redemption.

  New Equipment Notes..........................  The New Equipment Notes will not be
                                                 redeemable prior to March 15, 2002, except
                                                 pursuant to the mandatory redemption
                                                 provision described below. Thereafter, the
                                                 New Equipment 

</TABLE>

                                    15

<PAGE>

<TABLE>
<S>                                              <C>
                                                 Notes will be redeemable at the
                                                 option of WinStar Equipment, in whole or in
                                                 part, at the redemption prices set forth
                                                 herein plus accrued interest, if any, to the
                                                 date of redemption.
Mandatory Redemption of
  New Equipment Notes..........................  In the event that by March 18, 1999, WinStar
                                                 Equipment has not applied at least $200.0
                                                 million to fund the Acquisition Costs of
                                                 Designated Equipment ($200.0 million less the
                                                 amount so applied being herein called the
                                                 "Unused Equipment Amount"), WinStar Equipment
                                                 is required to redeem New Equipment Notes in
                                                 an aggregate principal amount equal to the
                                                 Unused Equipment Amount at a redemption price
                                                 of 112.50% of such principal amount, plus
                                                 accrued interest, if any, to the date of
                                                 redemption.

Change of Control..............................  Upon a Change of Control (as defined), each
                                                 holder of Notes may require the Issuer of
                                                 such Notes to repurchase such Notes at 101%
                                                 of (i) in the case of the New Senior Notes,
                                                 the Accumulated Amount of such Notes on the
                                                 date of repurchase and (ii) in the case of
                                                 the New Equipment Notes, the principal amount
                                                 of such Notes, plus, in either case, accrued
                                                 interest, if any, on such amount to the date
                                                 of repurchase.

Ranking

General........................................  At March 31, 1997, the Company had (on an
                                                 unconsolidated basis) approximately $600.0
                                                 million of indebtedness, $508.9 million of
                                                 which would have been senior indebtedness
                                                 (including the Old Equipment Note Guarantee
                                                 and the Company's outstanding 14% Senior
                                                 Discount Notes due 2005 ("1995 Senior
                                                 Notes")) and $91.1 million of which would
                                                 have been subordinated indebtedness
                                                 (consisting of the Company's outstanding 14%
                                                 Convertible Senior Subordinated Discount
                                                 Notes due 2005 (the "Convertible Notes" and,
                                                 together with the 1995 Senior Notes, the
                                                 "1995 Notes")). The Company is a holding
                                                 company and, accordingly, the New Senior
                                                 Notes and the New Equipment Note Guarantee
                                                 will be effectively subordinated to all
                                                 liabilities of the Company's subsidiaries,
                                                 including trade payables. At March 31, 1997,
                                                 the total liabilities of the Company's
                                                 subsidiaries was approximately $258.8
                                                 million, including trade payables.

New Senior Notes and New Equipment Note          The New Senior Notes and the New Equipment
  Guarantee....................................  Note Guarantee will be unsecured, senior
                                                 obligations of the Company, will rank PARI
                                                 PASSU in right of payment with all existing
                                                 and future senior indebtedness of the
                                                 Company, including the 1995 Senior Notes, and
                                                 will be senior in right of payment to all
                                                 existing and future subordinated indebtedness
                                                 of the Company, including the Convertible
                                                 Notes.

New Equipment Notes............................  The New Equipment Notes will be secured,
                                                 senior obligations of WinStar Equipment.

Security/Guarantee.............................  The New Equipment Notes will be secured by
                                                 liens on 
</TABLE>

                                   16

<PAGE>

<TABLE>
<S>                                              <C>
                                                 Designated Equipment purchased with
                                                 the proceeds of the Equipment Notes Offering.
                                                 In addition, the New Equipment Notes will be
                                                 unconditionally guaranteed by the Company
                                                 pursuant to the New Equipment Note Guarantee.

Restrictive Covenants..........................  The New Notes will be issued pursuant to the
                                                1997 Indentures, which restrict the
                                                incurrence of additional debt by WinStar, the
                                                issuance of debt and preferred stock by
                                                WinStar's subsidiaries, dividends on and
                                                redemptions of capital stock of WinStar, the
                                                redemptions of certain subordinated
                                                obligations of WinStar, the sale of assets
                                                and subsidiaries' stock and transactions with
                                                affiliates. The 1997 Indentures also prohibit
                                                certain restrictions on distributions from
                                                subsidiaries and will restrict WinStar from
                                                consolidating or merging with or transferring
                                                all or substantially all of its assets to
                                                another person. However, all of these
                                                restrictions and prohibitions are subject to
                                                a number of important qualifications,
                                                including the ability of WinStar to designate
                                                certain subsidiaries as unrestricted
                                                subsidiaries. The Equipment Note Indenture
                                                restricts WinStar Equipment from engaging in
                                                any business other than the ownership and
                                                leasing of the Designated Equipment and
                                                related activities.
</TABLE>


                            Risk Factors

    See "Risk Factors" commencing on page 20 hereof for a discussion of 
certain risks that should be considered in connection with an investment in 
the Notes, including the risks related to historical and anticipated future 
operating losses and negative EBITDA.

                                  17

<PAGE>
 
                            SUMMARY FINANCIAL INFORMATION
                    (In thousands of dollars, except per share data)
 
    The summary financial data presented below for the year ended February 
28, 1995, the ten months ended December 31, 1995 and the year ended December 
31, 1996 have been derived from the Company's audited Consolidated Financial 
Statements included in its Annual Report on Form 10-K for the year ended 
December 31, 1996, reclassified to reflect the operations of WinStar Global 
Products, Inc. ("Global Products"), the Company's merchandising subsidiary, 
as a discontinued operation. The summary financial data for the three months 
ended March 31, 1996 and 1997 have been derived from the unaudited 
Consolidated Financial Statements included in its Quarterly Report on Form 
10-Q for the three months ended March 31, 1997. In the opinion of management, 
the unaudited consolidated financial statements have been prepared on the 
same basis as the audited Consolidated Financial Statements and include all
adjustments, which consist only of normal recurring adjustments, necessary for a
fair presentation of the results of operations for the period.
 
<TABLE>
<CAPTION>
                                              TEN MONTHS                                    THREE MONTHS
                                YEAR ENDED      ENDED       YEAR ENDED      1996           ENDED MARCH 31,          1997
                               FEBRUARY 28,  DECEMBER 31,  DECEMBER 31,      PRO      -------------------------     PRO
                                   1995          1995          1996       FORMA(1)        1996          1997      FORMA(1)
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
<S>                            <C>           <C>           <C>           <C>          <C>            <C>         <C>
                                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
Statement of Operations Data:
Operating revenues:
  Telecommunications(2)......   $   14,909    $   13,137    $   33,969   $    32,481  $      10,217  $    7,063  $    7,063
  Information services.......          473         2,648        14,650        14,650            771       6,014       6,014
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
    Total net sales..........       15,382        15,785        48,619        47,131         10,988      13,077      13,077
Operating income (loss):
  Telecommunications.........       (4,984)       (7,288)      (43,698)      (49,805)        (3,105)    (26,546)    (26,546)
  Information services.......         (157)          217        (1,409)       (1,409)           (54)     (1,105)     (1,105)
  General corporate..........         (944)       (3,861)      (11,373)      (11,373)        (1,868)     (5,285)     (5,285)
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
    Total operating loss.....       (6,085)      (10,932)      (56,480)      (62,587)        (5,027)    (32,936)    (32,936)
Interest expense.............         (375)       (7,186)      (36,748)      (77,831)        (8,643)    (10,798)    (19,305)
Interest income..............          343         2,890        10,515         8,453          3,108       2,235       2,235
Other expenses, net..........       (1,109)         (866)           --       --            --            --          --
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
Net loss from continuing
  operations.................       (7,226)      (16,094)      (82,713)     (131,965)       (10,562)    (41,499)    (50,006)
Net (loss) income from
  discontinued
  operations(3)..............           (4)          237        (1,010)       (1,010)          (137)       (477)       (477)
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
Net loss.....................       (7,230)      (15,857)      (83,723)     (132,975)       (10,699)    (41,976)    (50,483)
Preferred stock dividends....       --            --            --            (6,000)      --              (833)     (1,500)
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
Net loss applicable to common
  stock......................   $   (7,230)   $  (15,857)   $  (83,723)  $  (138,975) $     (10,699) $  (42,809) $  (51,983)
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
Net loss per share from
  continuing operations......   $    (0.42)   $    (0.71)   $    (2.96)  $     (4.37) $       (0.39) $    (1.27) $    (1.58)
Net (loss) income per share
  from discontinued
  operations.................       --              0.01         (0.04)        (0.04)      --             (0.02)      (0.02)
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
Net loss per common share
  outstanding................   $    (0.42)   $    (0.70)   $    (3.00)  $     (4.41) $       (0.39) $    (1.29) $    (1.60)
                               ------------  ------------  ------------  -----------  -------------  ----------  ----------
Weighted average common
  shares outstanding.........       17,122        22,770        27,911        31,506         27,214      32,610      32,610
Other Financial Data:
Ratio of earnings to combined
  fixed charges and preferred
  stock
dividends(4).................           --            --            --       --            --            --          --
</TABLE>

                                       18
 
<PAGE>
 
<TABLE>
                                                                              
                                                                                                AS OF MARCH 31,
                                                                                                      1997
                                                                                                 (IN THOUSANDS)
                                                                                                     ACTUAL
                                                                                               -------------------
<S>                                                                                            <C>
Balance Sheet Data:
Cash, cash equivalents and short-term investments............................................      $   413,474
Property and equipment, net..................................................................           93,789
Total assets.................................................................................          748,869
Current portion of long-term debt and capital lease obligations..............................           23,095
Long-term debt and capital lease obligations, less current portion...........................          587,420
Common and preferred stock and additional paid-in capital....................................          247,270
Stockholders' equity.........................................................................           79,585

</TABLE>
 
- ------------------------
 
(1) Gives effect to an institutional private placement of $100 million of Units,
    consisting of preferred stock and warrants in February 1997 ("Preferred
    Stock Placement") and the 1997 Debt Placement as if they occurred as of the
    beginning of the respective periods. Interest expense has been adjusted to
    include approximately $8.5 million and $41.1 million of interest on such
    debt and amortization of debt offering costs and other related fees in the
    three months ended March 31, 1997 and the year ended December 31, 1996,
    respectively, but not to include interest income earned on additional
    available cash.
 
(2) The Company has generated minimal revenues from its Wireless Fiber services.
 
(3) Such loss is from the operations of the Company's consumer products
    subsidiary, WinStar Global Products, Inc. ("Global Products"). On May 13,
    1997, a formal plan of disposition for Global Products was approved by the
    Board of Directors, and it is anticipated that the disposition will be
    completed within the next 12 months. The disposition of Global Products has
    been accounted for as a discontinued operation and, accordingly, its net
    assets have been segregated from continuing operations in the balance sheet
    data, and its operating results are segregated and reported as discontinued
    operations in the statements of operations data.
 
(4) For the years ended February 28, 1993, 1994 and 1995, the ten months ended
    December 31, 1995, the year ended December 31, 1996 and the three months
    ended March 31, 1996 and 1997, earnings from continuing operations were
    insufficient to cover combined fixed charges and preferred stock dividends
    by $4,679,000, $8,622,000, $7,288,000, $16,310,000, $83,033,000, $10,562,000
    and $42,537,000, respectively. On a pro forma basis, giving effect to the
    items described in footnote 1 above, earnings from continuing operations
    were insufficient to cover combined fixed charges and preferred stock
    dividends by $51,711,000 and $138,285,000 for the three months ended March
    31, 1997 and the year ended December 31, 1996, respectively. Fixed charges
    consist of interest charges and amortization of debt expense and discount or
    premium related to indebtedness, whether expensed or capitalized, and that
    portion of rent expense (one-third) that the Company believes to be
    representative of interest.
 
FORWARD-LOOKING STATEMENTS
 
    This Prospectus and the documents incorporated by reference herein contain
certain forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995 with respect to the financial condition, results
of operations and business of the Company. These forward-looking statements
involve certain risks and uncertainties. No assurance can be given that any of
such matters will be realized. Factors that may cause actual results to differ
materially from those contemplated by such forward-looking statements include,
among others, the following: (a) the Company's ability to service its debt or to
obtain financing for the buildout of its telecommunications network; (b) the
Company's ability to attract and retain a sufficient revenue-generating customer
base; (c) competitive pressures in the telecommunications industry; and (d)
general economic conditions. For further information and other factors which
could affect the financial results of the Company and such forward-looking
statements, see "Risk Factors."
 
                                       19

<PAGE>
                                  RISK FACTORS
 
    The New Notes offered hereby contain the same terms and conditions as the
Old Notes and, accordingly, involve a high degree of risk. Each prospective
investor should carefully consider the following risk factors relating to both
the Old Notes and the New Notes.
 
HISTORICAL AND ANTICIPATED FUTURE NET AND OPERATING LOSSES AND NEGATIVE EBITDA
 
    The Company has incurred significant operating and net losses attributable
in substantial part to the development of its telecommunications businesses. The
Company historically has had net losses and negative EBITDA, including net
losses and negative EBITDA of approximately $15.9 million and $9.0 million,
respectively, for the ten months ended December 31, 1995, $83.7 million and
$49.6 million, respectively, for the year ended December 31, 1996 and $42.0
million and $29.4 million, respectively, for the three months ended March 31,
1997. The Company has been offering local access and other Carrier Services only
since December 1994, and local exchange services as a CLEC only since April
1996, and has made and is making significant expenditures in the development of
its local telecommunications operations, including expenditures associated with
establishing an operating infrastructure and introducing and marketing its
telecommunications services. The Company expects to continue to experience
significant and increasing operating losses, net losses and total and per share
amounts of net loss, along with decreasing net current assets, and to generate
increasingly negative EBITDA while it seeks to establish a sufficient
revenue-generating customer base and build its network infrastructure so that it
can provide services over its own facilities. As a result of increased expenses,
principally relating to an increase in the number of employees in connection
with the rollout of CLEC services and expenses relating to the servicing of
debt, there will continue to be substantial increases in the Company's net loss,
operating loss and negative EBITDA. There can be no assurance that the Company
will achieve or sustain positive EBITDA or profitability or at any time have
sufficient financial resources to make principal and interest payments on its
outstanding debt, including the Notes offered hereby.
 
SUBSTANTIAL INDEBTEDNESS; ABILITY TO SERVICE INDEBTEDNESS
 
    The Company has significant indebtedness and interest expense. At March 31,
1997, the Company had, on a consolidated basis, approximately $619.2 million of
indebtedness, including capitalized lease obligations. The accrual of interest
on the 1997 Notes and the accretion of original issue discount on the 1995 Notes
will significantly increase the Company's liabilities (except to the extent that
the Convertible Notes are converted into the Company's common stock (the "Common
Stock")). Additionally, the Company may need to incur additional indebtedness in
the future. The indentures pursuant to which the 1995 Notes were issued (the
"1995 Indentures") and the 1997 Indentures limit, but do not prohibit, the
incurrence of additional indebtedness by the Company and its subsidiaries.
Additionally, the 1995 Indentures and the 1997 Indentures do not limit the
amount of indebtedness that may be incurred by the Company's new media and
consumer products subsidiaries.
 
    The level of the Company's indebtedness could have important consequences,
including the following: (i) the combined debt service requirements of the 1995
Notes and the 1997 Notes could make it more difficult for the Company to make
payments on the Notes; (ii) the ability of the Company to obtain any necessary
financing in the future for working capital, capital expenditures, debt service
requirements or other purposes may be limited; (iii) a substantial portion of
the Company's cash flow from operations, if any, must be dedicated to the
payment of principal and interest on its indebtedness and other obligations and
will not be available for use in the Company's business; (iv) the Company's
level of indebtedness could limit its flexibility in planning for, or reacting
to changes in, its business; (v) the Company is more highly leveraged than many
of its competitors, which may place it at a competitive disadvantage; and (vi)
the Company's high degree of indebtedness would make it more vulnerable in the
event of a downturn in its business or if operating cash flow does not
significantly increase.

HOLDING COMPANY STRUCTURE; RANKING OF THE NOTES; SECURED INDEBTEDNESS
 
    The Company is a holding company and its only material assets consist of the
common stock of its operating subsidiaries and the proceeds raised from certain
private placements of equity and debt securities, all of which the Company has
loaned or contributed, or intends to loan or contribute, to its subsidiaries.
The Company may have to 

                                       20

<PAGE>

rely upon dividends and other payments from its subsidiaries to generate the 
funds necessary to pay the principal of and interest on the 1995 Notes and 
1997 Notes. The subsidiaries, however, are legally distinct from the Company 
and have no obligation, contingent or otherwise, to pay amounts due pursuant 
to the Notes (except for WinStar Equipment's obligation to pay the Equipment 
Notes) or the Equipment Note Guarantee or to make funds available for such 
payment. The Company's subsidiaries have not guaranteed the Old Notes and 
will not guarantee the New Notes. The ability of the Company's subsidiaries 
to make such dividends and other payments to the Company is subject to, among 
other things, the availability of funds, the terms of such subsidiaries' 
indebtedness and applicable state laws. See "Description of Certain 
Indebtedness and Preferred Stock." Claims of creditors of the Company's 
subsidiaries, including trade creditors, will generally have priority as to 
the assets of such subsidiaries over the claims of the Company and the 
holders of the Company's indebtedness, including the Senior Notes. 
Accordingly, the New Senior Notes and the New Equipment Note Guarantee will 
be effectively subordinated to all liabilities (including trade payables) of 
the subsidiaries of the Company. At March 31, 1997, the subsidiaries of the 
Company had approximately $258.8 million of liabilities (excluding 
intercompany payables to the Company and each other), including $227.5 
million of indebtedness (including the Equipment Notes). See "Description of 
the Notes."
 
    The New Senior Notes and the New Equipment Note Guarantee will be unsecured
indebtedness of the Company. At March 31, 1997, the Company had an aggregate of
approximately $619.2 million of indebtedness, including capitalized lease
obligations, approximately $227.6 million of which was secured by liens on
assets of the Company and/or its subsidiaries (including the Equipment Notes).
In the event such secured indebtedness goes into default and the holders thereof
foreclose on the collateral, the holders of secured indebtedness will be
entitled to payment out of the proceeds of their collateral prior to any holders
of general unsecured indebtedness, including the New Senior Notes and the New
Equipment Note Guarantee, notwithstanding the existence of any event of default
with respect to the New Senior Notes. The 1995 Indentures and 1997 Indentures
also permit the Company to incur additional secured indebtedness and to grant
additional liens. In the event of a bankruptcy, liquidation or reorganization of
the Company, holders of secured indebtedness will have a claim, prior to the
claim of the holders of the New Senior Notes, on the assets of the Company
securing such indebtedness. In addition, to the extent that the value of such
collateral is insufficient to satisfy such secured indebtedness, holders of
amounts remaining outstanding on such secured indebtedness (as well as other
unsubordinated creditors of the Company) are entitled to share PARI PASSU with
the 1995 Senior Notes and Senior Notes with respect to any other assets of the
Company. Assets remaining after satisfaction of the claims of holders of secured
indebtedness may not be sufficient to pay all or any portion of amounts due on
the Senior Notes then outstanding and the Equipment Note Guarantee. See
"Description of the Notes--Ranking."
 
LIMITED PURPOSE, ASSETS AND SOURCES OF REVENUES OF WINSTAR EQUIPMENT
 
    WinStar Equipment was recently organized by the Company solely to 
facilitate the financing and purchase of Designated Equipment. WinStar 
Equipment's assets consist solely of a combination of the proceeds received 
from the sale of the Old Equipment Notes, Designated Equipment and the 
Leases. WinStar Equipment's only source of revenues will be payments due to 
it pursuant to the terms of the Leases and, accordingly, the ability of 
WinStar Equipment to make payments of principal and interest on the Equipment 
Notes will be dependent on the ability of the lessees to make payments under 
the Leases. Accordingly, there can be no assurance that WinStar Equipment 
will be able to generate sufficient funds from its business to meet its 
obligations to pay principal and interest on the New Equipment Notes, in 
which event the Company would be obligated to make such payment in accordance 
with the Equipment Note Guarantee.
 
RISKS REGARDING THE COLLATERAL
 
    Although the Equipment Notes are secured by Designated Equipment acquired by
WinStar Equipment, the value of the collateral is expected to be substantially
less than the principal amount of the Equipment Notes. The Equipment Notes are
not secured by the proceeds from the issuance of the Equipment Notes, but only
by such Designated Equipment. As of June 30, 1997, WinStar Equipment has
accepted delivery of approximately $22.1 million of Designated Equipment, and
has placed orders for the purchase of approximately $17.5 million of additional
Designated Equipment. WinStar Equipment does not expect to use substantially all
the proceeds from the sale of the Equipment Notes until some time in late 1998
or early 1999. Until WinStar Equipment uses all such proceeds, the Equipment
Notes will not be secured by Designated Equipment having aggregate Acquisition
Costs equal to the 

                                       21

<PAGE>

principal amount of the Equipment Notes; and, in any event, the Acquisition 
Costs of any such Designated Equipment may not represent the value that a 
secured party would be able to receive upon enforcement of its security 
interest in such Designated Equipment. Furthermore, it is likely that the 
value of such Designated Equipment will decrease over time as such Designated 
Equipment is deployed in the business and equipment manufacturers develop 
improved products or similar products at reduced prices. Except for the 
requirement to redeem Equipment Notes in an amount equal to the unused 
proceeds from the issuance of the Equipment Notes, WinStar Equipment is not 
required to reduce the outstanding amount of the Equipment Notes based on the 
value of the collateral. Therefore, it is likely that, if the Equipment Notes 
were in default and the Trustee attempted to foreclose on the collateral, the 
value of the collateral would be substantially less than the amount of the 
indebtedness under the Equipment Notes.
 
    The security interest in Designated Equipment acquired by WinStar Equipment
will not arise until WinStar Equipment actually acquires such Designated
Equipment, which (except for the limited amount of equipment acquired
contemporaneously with the closing of the 1997 Debt Placement) will be
substantially after the issuance of the Equipment Notes. As a result, the
security interest arising in connection with the later acquired Designated
Equipment may be subject to challenge, in a bankruptcy or reorganization of
WinStar Equipment, as a preferential transfer insofar as such security interest
secures an antecedent debt. In such event, if WinStar Equipment became subject
to a bankruptcy or similar proceeding during the preference period (generally 90
days) following the acquisition of any Designated Equipment, the security
interest in such Designated Equipment could be set aside in such proceeding for
the benefit of other creditors (if any) of WinStar Equipment. See "Description
of the Notes."
 
FAILURE TO MAINTAIN PERFECTED SECURITY INTEREST
 
    Under the Equipment Notes Indenture, WinStar Equipment is required to 
secure the Equipment Notes by granting liens on the Designated Equipment. 
WinStar Equipment has filed UCC-1 financing statements naming WinStar 
Equipment as debtor and the Equipment Notes Trustee (as defined) as the 
secured party acting as collateral agent for holders of Equipment Notes with 
the Secretary of State or other appropriate office of each state in the 
United States. WinStar Equipment will covenant to maintain the effectiveness 
of such filings under the relevant provisions of the Uniform Commercial Code. 
However, the liens will be perfected only to the extent that such filings are 
sufficient to perfect liens on the Designated Equipment. Generally, filings 
will not be made in local filing offices, in real estate records, with any 
Federal office or agency or in respect of any certificate of title. Failure 
to make additional filings or to maintain the contemplated filings may allow 
other creditors of WinStar Equipment, if any, to obtain rights to the 
Designated Equipment equal or superior to those of the holders of the 
Equipment Notes. Owners or mortgagees of property on which items of 
Designated Equipment are installed may also obtain such rights. This could 
result in all or some of the value of the Designated Equipment acquired by 
WinStar Equipment not being available to the holders of the Equipment Notes 
to satisfy the outstanding indebtedness of the Equipment Notes in the event 
of a default. Such failure could arise, among other reasons, because of the 
failure to file continuation statements prior to the expiration of each 
five-year period after the initial filing or because of the failure to make 
the additional filings discussed above. Accordingly, investors should not 
rely on the perfection of any specific lien in making an investment decision 
to purchase Equipment Notes.
 
Need to Refinance Substantial Amount of Indebtedness to Repay Equipment
Notes at Maturity
 
    The Equipment Notes mature in March 2004. If WinStar Equipment does not have
cash flow from operations with which to pay the Equipment Notes, the Company, as
guarantor, would be required to pay the Equipment Notes, and in the absence of
sufficient cash flows of its own, the Company would be forced to raise the cash
to pay the Equipment Notes through equity offerings or additional debt
financings. The Company's ability to raise additional debt financing to repay
the Equipment Notes is severely restricted under the terms of the 1995
Indentures, which may require the Company to refinance the Old Notes prior to or
simultaneously with any refinancing of the Equipment Notes. Accordingly, the
Company may be forced to refinance a substantial amount of other indebtedness in
order for the Equipment Notes to be paid when due. There can be no assurance
that the Company will be able to refinance any or all of such indebtedness at
such time.

                                       22

<PAGE>
 
Risks Related to CLEC Strategy; Anticipated Initial Negative Operating
Margins in CLEC Business
 
    The Company is pursuing an accelerated strategy to enter the local exchange
services market as a CLEC in the metropolitan areas in which it has Wireless
Licenses and to develop and obtain the facilities necessary to provide its own
switched local exchange services. The Company has limited experience providing
local exchange services and there can be no assurance that the Company's CLEC
strategy will be successful. In addition, local exchange service providers have
never utilized 38 GHz wireless-based systems as a significant segment of their
local exchange services facilities and there can be no assurance that the
Company will be successful in implementing its Wireless Fiber-based system. The
Company's CLEC strategy is subject to risks relating to: the receipt of
necessary regulatory approvals; the negotiation and implementation of resale
agreements with other local service providers; the negotiation and
implementation of interconnection agreements with RBOCs and other incumbent
LECs; the failure of LECs and RBOCs to honor the letter and spirit of
consummated interconnection agreements; the ability of third-party equipment
providers and installation and maintenance contractors to meet the Company's
rollout schedule; the recruitment of additional personnel in a timely manner, so
as to be able to attract and service new customers but not incur excessive
personnel costs in advance of the rollout; the Company's ability to attract and
retain new customers through delivery of high-quality services; the potential
adverse reaction to the Company's services by the Company's carrier customers,
which may view the Company as a competitor; and the Company's ability to manage
the simultaneous implementation of its plan in multiple markets. In addition,
the Company is subject to the risk of unforeseen problems inherent in being a
new entrant in a rapidly evolving industry.
 
    Historically, almost all of the Company's telecommunications revenues have
been derived from the resale of long distance services to residential customers.
As part of its CLEC strategy, the Company is marketing its long distance
services to small and medium-sized businesses and is no longer actively
marketing such services to residential customers. As a result, revenues from the
provision of long distance services to residential customers have begun and are
expected to continue to substantially decline through attrition of the Company's
long distance residential customer base.
 
    Although the Company's initial implementation of its CLEC strategy entails
the resale of the facilities and services of other service providers, which
itself is dependent on the negotiation and implementation of satisfactory resale
arrangements, the Company's CLEC strategy will require significant capital
investment related to the purchase and installation of numerous switches and the
interconnection of these facilities to customers' buildings and LEC and CLEC
local networks, including the installation of Wireless Fiber links and the
buildout of other facility infrastructure, in advance of generating material
revenues.

    As the Company rolls out its CLEC operations, it will experience negative
operating margins while it develops its facilities. After initial rollout of its
CLEC services in a particular city, the Company expects operating margins for
such operations to improve only when and if: (i) sales efforts result in
sufficiently increased volumes of traffic; (ii) the Company has installed a
switch and a sufficient number of Wireless Fiber links so that a substantial
portion of the Company's traffic in that city can be originated and terminated
over the Company's Wireless Fiber facilities instead of LEC or other CLEC
facilities; and (iii) higher margin-enhanced services are sought by, provided to
and accepted by customers. While the Company believes that the unbundling and
resale of LEC services and the implementation of local telephone number
portability (which will permit customers to retain their telephone numbers when
switching carriers), which are mandated by the Telecommunications Act, will
reduce the Company's costs of providing local exchange services and facilitate
the marketing of such services, there can be no assurance that the Company's
CLEC operations will become profitable due to, among other factors, lack of
customer demand, competition from other CLECs and pricing pressure from the LECs
and other CLECs. The Company's failure to implement its CLEC strategy
successfully would have a material adverse effect on the operations of the
Company and the ability of the Company and its subsidiaries to make principal
and interest payments on their outstanding debt, including the Notes.
 
    Negative Operating Margins in the Initial Provision of Wireless Fiber-Based
Carrier Services
 
    The Company has experienced negative operating margins in connection with
the development and initial provision of its Wireless Fiber-based Carrier
Services and expects to continue to experience negative operating margins until
it develops a sufficient revenue-generating customer base for such services. In
order to demonstrate 

                                       23

<PAGE>

the efficacy of Wireless Fiber, the Company often provides complimentary 
service on a trial basis for a limited period. The Company expects to improve 
operating margins in the provision of its Carrier Services over time by: (i) 
continuing to obtain appropriate Roof Rights; (ii) acquiring and retaining an 
adequate customer base; (iii) placing telecommunications traffic of new 
customers and additional telecommunications traffic of existing customers 
across installed Wireless Fiber links; and (iv) inducing providers of 
telecommunications services to utilize and market the Company's Wireless 
Fiber services as part of their own networks, systems and services, thereby 
reducing the Company's related marketing costs. If the Company fails to 
accomplish any of the foregoing, particularly acquiring and retaining an 
adequate customer base, it will not be able to improve the operating margins 
of its Carrier Services business. There can be no assurance that the Company 
will be able to achieve or sustain positive operating margins. Failure to 
achieve positive operating margins would have a material adverse effect on 
the operations of the Company and the ability of the Company and its 
subsidiaries to make principal and interest payments on their outstanding 
debt, including the Notes.
 
RISKS ASSOCIATED WITH RAPID EXPANSION AND ACQUISITIONS
 
    The Company intends to pursue a strategy of aggressive and rapid growth, 
including the accelerated rollout of its CLEC services, acquisitions of 
businesses and assets, including additional spectrum licenses, continued 
marketing of its Carrier Services, and the hiring of additional management, 
technical and marketing personnel, all of which will result in significantly 
higher operating expenses. Rapid expansion of the Company's operations may 
place a significant strain on the Company's management, financial and other 
resources. The Company's ability to manage future growth, should it occur, 
will depend upon its ability to monitor operations, control costs, maintain 
effective quality controls and significantly expand the Company's internal 
management, technical, information and accounting systems. Any failure to 
expand these areas and to implement and improve such systems, procedures and 
controls in an efficient manner at a pace consistent with the growth of the 
Company's business could have a material adverse effect on the business, 
financial condition and results of operations of the Company and the ability 
of the Company and its subsidiaries to make principal and interest payments 
on their outstanding debt, including the Notes. As part of its strategy, the 
Company may acquire complementary assets or businesses. The pursuit of 
acquisition opportunities will place significant demands on the time and 
attention of the Company's senior management and will involve considerable 
financial and other costs with respect to identifying and investigating 
acquisition candidates, negotiating acquisition agreements and integrating 
the acquired businesses with the Company's existing operations. Employees and 
customers of acquired businesses may sever their relationship with such 
businesses during or after the acquisition. There can be no assurance that 
the Company will be able to successfully consummate any acquisitions or 
integrate any business or assets which it may acquire into its operations.
 
COMPETITION
 
    The Company is subject to intense competition in each of the areas in which
it operates. Many of the Company's competitors have longer-standing
relationships with customers and suppliers in their respective industries,
greater name recognition and significantly greater financial, technical and
marketing resources than the Company. Further, sales of the Company's Carrier
Services are typically made to other telecommunications providers that compete
or may compete in the future with the Company.
 
    LOCAL TELECOMMUNICATIONS MARKET.  The local telecommunications market is
intensely competitive for new entrants and currently is dominated by the RBOCs
and other LECs. The LECs have long-standing relationships with their customers,
have the ability to subsidize competitive services with revenues from a variety
of other services and benefit from existing state and federal regulations that
currently favor the LECs over the Company in certain respects. In addition to
competition from the LECs, the Company also faces competition from a growing
number of new market entrants, such as other CLECs and CAPs. The Company also
may face competition in the provision of local telecommunications services from
cable companies, electric utilities, LECs operating outside their current local
service areas and IXCs. Moreover, the consolidation of telecommunications
companies and the formation of strategic alliances within the telecommunications
industry, which are expected to accelerate as a result of the passage of the
Telecommunications Act, could give rise to significant new or stronger
competitors. The Company currently also faces or anticipates facing competition
from other entities which offer, or are licensed to offer, 38 GHz services and
could face competition in certain aspects of its existing and proposed
businesses from competitors providing wireless services in other portions of the
radio spectrum (including 2 GHz, 18 GHz, 24 GHz, 28 GHz and 47 GHz, among

                                       24

<PAGE>

others). The initial perceived success of the Company's business is also likely
to encourage increased competition from other spectrum users. The Company's
Internet services also face significant competition from, among others, cable
television operators deploying cable modems that provide high-speed data
transmission over existing coaxial cable television networks. As competition
increases in the local telecommunications market, the Company anticipates that
general pricing competition and pressures will increase significantly. The
Company has not obtained significant market share in any of the areas where it
offers its services, nor does it expect to do so given the size of the local
telecommunications services market, the intense competition therein and the
diversity of customer requirements. There can be no assurance that the Company
will be able to compete effectively in any of its markets.
 
    LONG DISTANCE MARKET.  The long distance market has relatively 
insignificant barriers to entry, numerous entities competing for the same 
customers and a high (and increasing) average churn rate as customers 
frequently change long distance providers in response to the offering of 
lower rates or promotional incentives by competitors. The Company competes 
for long distance customers with major IXCs, as well as other national and 
regional long distance carriers and resellers, many of whom own substantially 
all of their own facilities and are able to provide services at costs lower 
than the Company's current costs since the Company generally leases its 
access facilities. The Company believes that the RBOCs and CLECs also will 
become significant competitors in the long distance telecommunications 
industry. To maintain its competitive posture, the Company believes that it 
must be in a position to reduce its prices in order to meet reductions in 
rates, if any, by competitors. Any such reductions could adversely affect the 
Company. In addition, LECs have been obtaining additional pricing and 
regulatory flexibility. This may enable LECs to grant volume discounts to 
larger long distance companies, which also could put the Company's long 
distance business at a disadvantage in competing with larger providers.
 
    NEW MEDIA BUSINESS.  The industry in which the Company's new media
subsidiary competes consists of a very large number of entities producing,
owning or controlling news, sports, entertainment, educational and informational
content and services, including telecommunications companies, television
broadcast companies, sports franchises, film and television studios, record
companies, newspaper and magazine publishing companies, universities and on-line
computer services. Competition is intense for timely and highly marketable or
usable information and entertainment content. Almost all of the entities with
which the Company's new media subsidiary competes have significantly greater
presence in the various media markets and greater resources than the Company,
including existing content libraries, financial resources, personnel and
existing distribution channels. There can be no assurance that the Company will
be able to compete successfully in the emerging new media industry.
 
SIGNIFICANT CAPITAL REQUIREMENTS
 
    The expansion of the Company's telecommunications operations and the
continued funding of operating expenses will require substantial capital
investment. Additionally, as part of its strategy, the Company may seek to
acquire complementary assets or businesses (including additional spectrum
licenses, by auction or otherwise), which also could require substantial capital
investment. The Company's decision to accelerate the development of its CLEC
operations in response to the Telecommunications Act substantially increased the
Company's capital expenditure requirements. Management anticipates, based on
current plans and assumptions relating to its operations, that the Company's
existing financial resources and additional equipment financing arrangements
which the Company intends to seek, will be sufficient to fund the Company's
growth and operations for approximately 24 to 30 months from the date of this
Prospectus. In order to provide additional future liquidity to the Company, the
Company obtained a $150 million facility from affiliates of the Initial
Purchasers in March 1997. The Company continues to have available $100 million
of such facility (the issuance in August 1997 by WinStar Equipment II Corp., a
wholly owned subsidiary of the Company, of certain notes having reduced
availability by $50 million), which subject to the Company satisfying various
operating and financial criteria, may be drawn by the Company on March 31, 1999.
The amount of the commitment may be further reduced in certain circumstances,
including as a result of the issuance of additional securities by the Company
prior to March 31, 1999.
 
    In the event the Company's plans or assumptions change or prove to be
inaccurate, or if the Company consummates any acquisitions of businesses or
assets (including additional spectrum licenses, by auction or otherwise), or if
the Company fails to secure additional equipment financing arrangements, the
Company may be required to seek additional sources of capital sooner than
currently anticipated. Sources of additional capital may include public and
private equity and debt financing, sales of nonstrategic assets and other
financing arrangements. 

                                       25

<PAGE>

There can be no assurance that the Company will be able to obtain additional 
financing or, if such financing is available, that the Company will be able 
to obtain it on acceptable terms. Failure to obtain additional financing, if 
needed, could result in the delay or abandonment of some or all of the 
Company's development and expansion plans, which would have a material 
adverse effect on the Company's business and could adversely affect the 
ability of the Company and its subsidiaries to make principal and interest 
payments on their outstanding debt, including the Notes.
 
GOVERNMENT REGULATION
 
    The Company's telecommunications services are subject to varying degrees 
of federal, state and local regulation. Generally, the FCC exercises 
jurisdiction over all telecommunications services providers to the extent 
such services involve the provision of jurisdictionally interstate or 
international telecommunications, including the resale of long distance 
services, the provision of local access services necessary to connect callers 
to long distance carriers and the use of electromagnetic spectrum (i.e., 
wireless services). With the passage of the Telecommunications Act, the FCC's 
jurisdiction has been extended to include certain interconnection and related 
issues that traditionally have been considered subject primarily to state 
regulation. The state regulatory commissions retain jurisdiction over the 
provision of telecommunications services to the extent such services involve 
the provision of jurisdictionally intrastate telecommunications in certain 
instances, and retain exclusive jurisdiction with respect to the pricing of 
unbundled elements.
 
    The Telecommunications Act is intended to remove the formal barriers between
the long distance and local telecommunications services markets, allowing
service providers from each market (as well as providers of cable television and
other services) to compete in all communications markets. The Telecommunications
Act will permit the RBOCs eventually to compete in the provision of long
distance services between local access transport areas ("LATAs"). Additionally,
the FCC is required to promulgate new regulations over the next several years to
address mandates contained in the Telecommunications Act, which will change the
regulatory environment significantly. The Telecommunications Act generally
requires LECs to provide competitors with interconnection and nondiscriminatory
access to the LEC network on more favorable terms than have been available in
the past. However, such interconnection and the terms thereof are subject to
negotiations with each LEC, which may involve considerable delays and may not
necessarily be obtained on terms and conditions that are acceptable to the
Company. In such instances, although the Company may petition the proper
regulatory agency to arbitrate disputed issues, there can be no assurance that
the Company will be able to obtain acceptable interconnection agreements.
 
    As required by the Telecommunications Act, the FCC adopted, in August 1996,
new rules implementing the interconnection and resale provisions of the
Telecommunications Act (the "Interconnection Order"). These rules generally
constitute a pro-competitive national policy framework designed to remove or
minimize the regulatory, economic and operational impediments to full
competition for local services, including switched local exchange service. In
July 1997, the United States Court of Appeals for the Eighth Circuit invalidated
certain provisions of the Interconnection Order, including those provisions in
which the FCC asserted jurisdiction over the pricing of interconnection elements
and the "pick and choose" provisions for select provisions of other carriers'
interconnection agreements. As has been the case since the Interconnection Order
was stayed by the Court in October 1996, many states continue to set the prices
for interconnection, resale and unbundled network elements in a similar manner
as proposed by the FCC in the Interconnection Order. The FCC has indicated its
intention to appeal the Eighth Circuit's ruling to the United States Supreme
Court. The Company believes that the Eighth Circuit's ruling will not adversely
affect its CLEC operations and may, in certain instances, positively affect the
operations of its Carrier Services business, although there can be no assurance
of this. In addition, pursuant to the Telecommunications Act, the FCC recently
promulgated regulations to implement universal service reform to provide support
for the provision of ubiquitous national telephone service as well as the
provision of telecommunications services to schools (kindergarten through 12th
grade) and to effect access charge reform to more explicitly align the access
charges required to be paid by the long distance carriers to incumbent LECs to
the actual cost of providing such services. Appeals from these orders have been
filed by a number of parties and these appeals have been consolidated in the
Fifth and Eighth Circuits, respectively. In light of the continued litigation
challenging the Telecommunications Act and the FCC's rules thereunder, and other
factors, the Company is unable to predict with specificity what effect the
Telecommunications Act or recently promulgated FCC regulations will have on the
telecommunications industry in general and on the Company in particular. No
assurance can be given that any regulation will broaden the opportunities
available to the Company or will not have a material adverse effect on the

                                       26

<PAGE>

Company and its operations. Further, there can be no assurance that the Company
will be able to comply with additional applicable laws, regulations and
licensing requirements or have sufficient resources to take advantage of the
opportunities which may arise from this dynamic regulatory environment.
 
    Additionally, providers of telecommunications services, including the major
IXCs, RBOCs, CLECs and others, are coming under intensified scrutiny for
activities by them or their agents which may result in unauthorized switching of
customers from one service provider to another or, in other instances, cause
unfair impediment to customers wishing to switch providers. The FCC and a number
of state authorities are seeking to introduce more stringent regulation to
curtail the intentional or erroneous switching of customers, which could include
the imposition of fines, penalties and possible operating restrictions on
entities which engage in unauthorized switching activities. In addition, the
Telecommunications Act requires the FCC to prescribe regulations imposing
procedures for verifying the switching of customers and additional remedies on
behalf of carriers for unauthorized switching of their customers. The effects,
if any, of the adoption of any such regulations would have on the
telecommunications industry and the business practices therein cannot be
predicted. Statutes and regulations which are or may become applicable to the
Company as it expands could require the Company to alter methods of operations,
at costs which could be substantial, or otherwise limit the types of services it
offers.
 
Finite Initial Term of Wireless Licenses; Potential License Renewal Costs;
Fluctuations in the Value of Wireless Licenses; Transfer of Control
 
    The FCC's current policy is to align the expiration dates of all 38 GHz
licenses such that they mature concurrently and, upon expiration, to renew all
such licenses for ten years. The initial term of all currently outstanding 38
GHz licenses, including the Company's licenses, expires in February 2001. While
the Company believes that all of its Wireless Licenses will be renewed based
upon FCC custom and practice establishing a presumption in favor of licensees
that have complied with their regulatory obligations during the initial license
period, there can be no assurance that any Wireless License will be renewed upon
expiration of its initial term.
 
    In a notice of proposed rulemaking ("NPRM"), the FCC proposed auctioning
licenses for currently unallocated 38 GHz channels. Given the current political
climate with respect to balancing the federal budget, there is a risk that the
FCC will require significant payments upon renewal of the Company's Wireless
Licenses or other changes on the use of spectrums. The FCC's failure to renew,
or its imposition of significant charges for renewal or use of, one or more
Wireless Licenses could have a material adverse effect on the Company and the
ability of the Company and its subsidiaries to make principal and interest
payments on their outstanding debt, including the Notes.
 
    The Wireless Licenses are integral assets of the Company, the value of which
will depend significantly upon the success of the Company's wireless
telecommunications operations and the future direction of the wireless
telecommunications segment of the telecommunications industry. The value of
licenses to provide wireless services also may be affected by fluctuations in
the level of supply and demand for such licenses. Any assignment of a license or
transfer of control by an entity holding a license is subject to certain
limitations relating to the identity and qualifications of the transferee and
requires prior FCC approval (and in some instances state regulatory approval as
it relates to the provision of telecommunications services in that state),
thereby possibly diminishing the value of the Wireless Licenses.
 
    The Company has entered into agreements to acquire a number of additional 38
GHz licenses. The transfer of licenses issued by the FCC, including 38 GHz
licenses (as well as a change of control of entities holding licenses), is
subject to the prior consent of the FCC, which consent generally turns on a
number of factors including the identity, background and the legal and financial
qualifications of the transferee and the satisfaction of certain other
regulatory requirements. In addition, the existence of proposed channel
limitations in the NPRM, which in at least one licensed area may result in the
Company exceeding the proposed maximum number of licenses for that area, may
result in the FCC denying consent for one or more license transfers. In light of
the foregoing, the newness of this service and the uncertainty of final
regulations to be issued in connection with the NPRM, there can be no assurance
that the FCC will approve all or any of the proposed acquisitions or, if
approved, that the FCC will not impose limitations on the ultimate number of
licenses held in any particular licensed area.

                                       27

<PAGE>

CHANGES IN TECHNOLOGY, SERVICES AND INDUSTRY STANDARDS
 
    The telecommunications industry has been characterized by rapid
technological change, changing end-user requirements, frequent new service
introductions and evolving industry standards. The Company believes that its
future success will depend on its ability to anticipate or adapt to such changes
and to offer, on a timely basis, services that meet these evolving industry
standards. The extent to which competitors using existing or currently
undeployed methods of delivery of local telecommunications services will compete
with the Company's Wireless Fiber services cannot be anticipated. There can be
no assurance that existing, proposed or as yet undeveloped technologies will not
become dominant in the future and render 38 GHz-based (and other spectrum-based)
systems less profitable or less viable. For example, there are several existing
technologies that may be able to allow the transmission of high bandwidth
traffic over existing copper lines or unlicensed spectrum. There can be no
assurance that the Company will have sufficient resources to make the
investments necessary to acquire new technologies or to introduce new services
that could compete with future technologies or that equipment held by the
Company in inventory will not be rendered obsolete, any of which would have an
adverse effect on the operations of the Company and the ability of the Company
and its subsidiaries to make principal and interest payments on their
outstanding debt, including the Notes.
 
CERTAIN FINANCIAL AND OPERATING RESTRICTIONS
 
    The 1997 Indentures and the 1995 Indentures impose significant operating and
financial restrictions on the Company, affecting, and in certain cases limiting,
among other activities, the ability of the Company to incur additional
indebtedness or create liens on its assets, pay dividends, sell assets, engage
in mergers or acquisitions or make investments. Failure to comply with any such
restrictions could limit the availability of borrowings or result in a default
under the terms of any such indebtedness, and there can be no assurance that the
Company will be able to comply with such restrictions. Moreover, these
restrictions could limit the Company's ability to engage in certain business
transactions which the Company may desire to consummate. The Company's inability
to consummate any such transaction could have an adverse effect on the Company's
operations and the ability of the Company and its subsidiaries to make principal
and interest payments on their outstanding debt, including the Notes.
 
Original Issue Discount; Possible Unfavorable Tax and Other Legal
Consequences for Holders of Senior Notes and the Company
 
    As there will be no periodic payments in cash of interest on the Senior
Notes prior to April 2001, original issue discount (the difference between the
stated redemption price at maturity and the issue price of the Senior Notes)
will accrue from the issue date of the Senior Notes. Original issue discount
must be included as interest income periodically in a United States noteholder's
gross income for United States federal income tax purposes in advance of receipt
of the cash payments to which the income is attributable. See "Certain United
States Federal Income Tax Considerations" for a more detailed discussion of the
United States federal income tax consequences to holders of Senior Notes
regarding the purchase, ownership and disposition of such Notes.
 
    Further, the Senior Notes will be subject to the high yield discount 
obligation rules. Consequently, the Company will not be able to deduct the 
original issue discount attributable to the Senior Notes until actually paid. 
As explained in, and subject to, the discussion under "Certain United States 
Federal Income Tax Consequences--Tax Consequences to U.S. Holders--Applicable 
High Yield Discount Rules," the Senior Notes will be subject to these rules 
because their yield to maturity equals or exceeds the Treasury-based interest 
rate in effect for the month of their issuance plus five percentage points. 
For mid-term debt instruments issued in March 1997, such Treasury-based 
interest rate plus five percentage points is 11.32%, compounded semiannually. 
Moreover, because the yield to maturity of the Senior Notes exceeds a 
Treasury-based interest rate in effect for the month of their issuance plus 
six percentage points, a portion of the original issue discount attributable 
to the Senior Notes will not be deductible at all. For mid-term debt 
instruments issued in March 1997, such Treasury-based interest rate plus six 
percentage points is 12.32%, compounded semiannually. As a result of the 
application of these high yield discount rules, the Company's after tax cash 
flow might be less than if such original issue discount were deductible when 
accrued.

                                       28

<PAGE>

Dependence on Third Parties for Service and Marketing; Possible Service
Interruptions and Equipment Failures
 
    The Company's long distance resale business is dependent on utilizing the
facilities of major IXCs to carry its customers' long distance telephone calls
and, in many instances, especially during initial market penetrations, the
Company's CLEC business will be dependent on the facilities of the LECs and
other local exchange service providers to carry its customers' local telephone
calls. The Company has an agreement with MCI that provide it with access to such
carrier's networks and has entered or is entering into interconnect agreements
with various LECs, and other CLECs, to access their local exchange facilities.
Although the Company believes that it currently has sufficient access to long
distance networks and will be able to obtain sufficient access to local exchange
facilities, any increase in the rates or access fees charged by the owners of
such facilities or their unwillingness to provide access to such facilities to
the Company, as well as potential reticence of the LECs to honor appropriate
provisioning and service intervals with respect to interconnection arrangements,
could materially adversely affect the Company's operations. Failure to obtain
continuing access to such networks and facilities could require the Company to
significantly curtail or cease its operations and could have an adverse effect
on the ability of the Company and its subsidiaries to make principal and
interest payments on their outstanding debt, including the Notes. See
"Description of Certain Indebtedness and Preferred Stock." Further, the
Company's CLEC operations will rely to some extent upon network elements which
the LECs must provide pursuant to the Telecommunications Act and the
Interconnection Order. These facilities often use copper wire for "last mile"
access to end users. To the extent that the Company relies upon LEC facilities
that use copper wire, the Company may not be able to offer potential customers
the benefits of Wireless Fiber with respect to high transmission capacity and
quality. In addition, the Company's operations require that the networks leased
by it, and any facilities which may be developed by the Company, operate on a
continuous basis. It is not unusual for networks and switching facilities to
experience periodic service interruptions and equipment failures. It is
therefore possible that the networks and facilities utilized by the Company may
from time to time experience service interruptions or equipment failures
resulting in material delays which would adversely affect consumer confidence as
well as the Company's business operations and reputation.
 
    The Company utilizes, in certain cases, third parties for marketing its
Wireless Fiber services and maintaining its operational systems. The Company has
entered into master service agreements with other telecommunications providers
that allow those companies to utilize and resell the Company's Wireless Fiber
services to their own customers. The Company also has an agreement with Lucent
to provide field service for, and network monitoring of, the Company's Wireless
Fiber facilities and another agreement with Lucent for the purchase by the
Company of telecommunications switches and related equipment. The failure of any
of these third parties to perform under their respective agreements or the loss
of any of these agreements could have a material adverse effect on the Company's
results of operations and its ability to service its customers. The Company has
approached a number of major telecommunications service providers to solicit
interest in entering into a multi-year, multi-region network transaction in
which the Company would build and maintain a co-exclusive network utilizing
Wireless Fiber for providing access to their customer base. Although there can
be no assurance that such a transaction will be entered into, the Company
believes that such a transaction would be attractive to a number of these
provides and is in various stages of discussions with them.
 
RELIANCE ON EQUIPMENT SUPPLIERS
 
    The Company currently purchases substantially all of its wireless 
telecommunications equipment, including transceivers and network monitoring 
equipment, from a single supplier and its switches and related equipment from 
a single supplier even though, in each case, there are other manufacturers of 
such equipment. Any reduction or interruption in supply from its suppliers 
could have a material adverse effect on the Company until sufficient 
alternative supply sources are established. The Company does not manufacture, 
nor does it have the capability to manufacture, any of its telecommunications 
equipment. Although there are other manufacturers who have, or are 
developing, equipment that would satisfy the Company's needs, there can be no 
assurance that the Company would be able to replace its current primary 
suppliers on commercially reasonable terms. In addition, as no industry 
standard or uniform protocol currently exists for 38 GHz equipment, a single 
manufacturer's equipment must be used in establishing each wireless link.

                                       29

<PAGE>
 
Line of Sight; Distance Limitations Imposed by Rainfall Conditions in
Certain Geographic Areas; Roof Rights
 
    In order to provide quality transmission, Wireless Fiber services require an
unobstructed line of sight between two transceivers comprising a link, with a
maximum distance between any two corresponding transceivers of up to five miles
(or shorter distances in certain areas; weather conditions may necessitate
distances as short as 1.1 miles between transceivers to maintain desired
transmission quality). The areas in which such shorter distances are required
are those where rainfall intensity and the size of the raindrops adversely
impact transmission quality at longer distances. Other weather conditions, such
as snow, electrical storms and high winds, have not, in the Company's
experience, affected the quality or reliability of Wireless Fiber services. The
establishment of Wireless Fiber services may require additional transceivers to
triangulate around obstacles (such as buildings). Similarly, to establish
Wireless Fiber services covering a distance in excess of five miles, additional
transceivers are required to establish a chain with links no more than five
miles apart or to establish a system of interconnected hub sites. The cost of
additional transceivers where required by weather, physical obstacles or
distance may render Wireless Fiber uneconomical in certain instances. The
Company must obtain Roof Rights (or rights to access other locations where lines
of sight are available) in each building where a transceiver will be placed. The
Company seeks to prequalify and obtain Roof Rights at buildings targeted by
potential customers in its licensed areas in advance of anticipated orders.
There can be no assurance, however, that the Company will be successful in
obtaining Roof Rights necessary to establish its Wireless Fiber services in its
potential markets. The Company's prequalification activities often require the
payment of option fees to the owners of buildings that are being prequalified.
There can be no assurance that the Company will receive orders for Wireless
Fiber services which allow the Company to utilize Roof Rights it obtains.
 
UNCERTAINTY OF MARKET ACCEPTANCE OF WIRELESS FIBER SERVICES
 
    The Company has been marketing its Wireless Fiber services since December 
1994. The Company has not obtained a significant market share in any of the 
licensed areas where it offers Wireless Fiber services. The provision of 
wireless local telecommunications services over 38 GHz represents an emerging 
sector of the telecommunications industry and the demand for and acceptance 
of Wireless Fiber services are subject to a high level of uncertainty. 
Despite the Company's initial success in attracting customers, there can be 
no assurance that substantial markets will develop for wireless local 
telecommunications services delivered over 38 GHz or that, even if such 
markets develop, the Company will be able to succeed in positioning itself as 
a provider of such services or provide such services profitably. The 
Company's success in providing wireless broadband services is subject to a 
number of factors beyond the Company's control. These factors include, 
without limitation, historical perceptions of the unreliability and lack of 
security of previous microwave radio technologies, changes in general and 
local economic conditions, availability of equipment, changes in 
telecommunications service rates charged by other service providers, changes 
in the supply and demand for wireless broadband services, competition from 
wireline and wireless operators in the same market area and changes in the 
federal and state regulatory schemes affecting the operations of 
telecommunications service providers in general and wireless broadband 
systems in particular (including the enactment of new statutes and the 
promulgation of changes in the interpretation or enforcement of existing or 
new rules and regulations). In addition, the extent of the potential demand 
for wireless broadband services in the Company's target markets cannot be 
estimated with certainty. There can be no assurance that one or more of these 
factors will not have an adverse effect on the Company's financial condition 
and results of operations and the ability of the Company and its subsidiaries 
to make principal and interest payments on their outstanding debt, including 
the Notes.
 
RELIANCE ON KEY PERSONNEL
 
    The efforts of a relatively small number of key management and operating
personnel will largely determine the Company's success. The loss of any of such
personnel could adversely affect the Company. The Company's success also depends
in part upon its ability to hire and retain highly skilled and qualified
operating, marketing, financial and technical personnel. The competition for
qualified personnel in the telecommunications industry is intense. Accordingly,
there can be no assurance that the Company will be able to hire or retain
necessary personnel.

                                       30

<PAGE>
 
LACK OF PUBLIC MARKET FOR SECURITIES
 
    There is no public market and only a limited secondary market for the Notes.
The Old Notes are and the New Notes will be designated eligible for trading in
The Private Offerings, Resales and Trading through Automated Linkages (PORTAL)
Market of The Nasdaq Stock Market, Inc. Notes traded after their initial
issuance may trade at a discount from their initial offering price, depending
upon prevailing interest rates, the market for similar securities and other
factors, including general economic conditions and the financial condition of,
performance of, and prospects for the Company.
 
INVESTMENT COMPANY ACT CONSIDERATIONS
 
    After giving effect to the Offering, the Company will have substantial cash,
cash equivalents and short-term investments. See "Capitalization." Such amount
may be invested from time to time in investment securities, which may result in
the Company being treated as an "investment company" under the Investment
Company Act of 1940 (the "1940 Act"). The 1940 Act requires the registration of,
and imposes various substantive restrictions on, certain companies ("investment
companies") that are, or hold themselves out as being, engaged primarily, or
propose to engage primarily in, the business of investing, reinvesting or
trading in securities, or that fail certain statistical tests regarding
composition of assets and sources of income and are not primarily engaged in
businesses other than investing, reinvesting, owning, holding or trading
securities.
 
    The Company believes that it is primarily engaged in a business other than
investing, reinvesting, owning, holding or trading securities and, therefore, is
not an investment company within the meaning of the 1940 Act. If the Company is
found to be an investment company, the Company intends to rely upon an exemption
from the 1940 Act for certain "transient" or temporary investment companies.
However, such exemption is only available for one year.
 
    If the Company were required to register as an investment company under the
1940 Act, it would become subject to substantial regulation with respect to its
capital structure, management, operations, transactions with affiliated persons
(as defined in the 1940 Act) and other matters. Application of the provisions of
the 1940 Act to the Company would have a material adverse effect on the Company.
In addition, if the Company is an investment company under the 1940 Act, the
Notes will not be eligible to be resold in reliance on Rule 144A under the
Securities Act and certain holders of the Notes may not be able to own the
Notes. In such event, the market price of the Notes may be adversely affected.
 
CONSEQUENCES OF THE EXCHANGE OFFER ON NON-TENDERING HOLDERS OF THE OLD NOTES
 
    In the event the Exchange Offer is consummated, the Company may not be 
required to register certain of the Old Notes not tendered and accepted in 
the Exchange Offer. In such event, holders of certain of the Old Notes 
seeking liquidity in their investment would have to rely on exemptions to the 
registration requirements under the securities laws, including the Securities 
Act. Following the consummation of the Exchange Offer, certain of the Old 
Notes may not be entitled to the contingent increase in interest rate 
provided for in the event of a failure to consummate the Exchange Offer in 
accordance with the terms of the Registration Agreement.
 
                                       31

<PAGE>

                               THE EXCHANGE OFFER
 
PURPOSE AND EFFECT OF THE EXCHANGE OFFER
 
    The Old Notes were sold by the Issuers in the 1997 Debt Placement to the
Initial Purchasers who, in turn, sold such Old Notes to certain qualified
institutional buyers in reliance on Rule 144A under the Securities Act. In
connection with the 1997 Debt Placement, the Company and WinStar Equipment
entered into the Registration Agreement, pursuant to which each of the Company
and WinStar Equipment agreed to use its best efforts to consummate this Exchange
Offer of the Old Notes for the New Notes pursuant to an effective registration
statement by September 15, 1997. Unless the context requires otherwise, the term
"holder" with respect to the Exchange Offer means any person in whose name Old
Notes are registered on the books of the Company, or any other person who has
obtained a properly completed bond power from the registered holder, or any
person whose Old Notes are held of record by DTC (who may deliver such Old Notes
by book-entry transfer at DTC).
 
    The Company has not requested, and does not intend to request, an
interpretation by the staff of the Commission with respect to whether the New
Notes issued pursuant to the Exchange Offer in exchange for the Old Notes may be
offered for sale, resold or otherwise transferred by any holder without
compliance with the registration and prospectus delivery provisions of the
Securities Act. Based on interpretations by the staff of the Commission set
forth in no-action letters issued to third parties, the Company believes that
New Notes issued pursuant to the Exchange Offer in exchange for Old Notes may be
offered for resale, resold and otherwise transferred by any holder of such New
Notes (except in the case of broker-dealers, as set forth below) without
compliance with the registration and prospectus delivery provisions of the
Securities Act, provided that such New Notes are acquired in the ordinary course
of such holder's business and such holder has no arrangement or understanding
with any person to participate in the distribution of such New Notes. Any holder
who tenders in the Exchange Offer for the purpose of participating in a
distribution of the New Notes may not rely on such interpretation by the staff
of the Commission and must comply with the registration and prospectus delivery
requirements of the Securities Act in connection with any secondary resale
transaction. Each broker-dealer that receives New Notes for its own account in
exchange for Old Notes, where such Old Notes were acquired by such broker-dealer
as a result of market-making activities or other trading activities, must
acknowledge that it will deliver a prospectus in connection with any resale of
such New Notes. See "Plan of Distribution."
 
    By tendering in the Exchange Offer, each holder of Old Notes will represent
to the Company and WinStar Equipment, as the case may be, that, among other
things, (i) the New Notes acquired pursuant to the Exchange Offer are being
obtained in the ordinary course of business of the person receiving such New
Notes, whether or not such person is such holder, (ii) neither the holder of Old
Notes nor any such other person has an arrangement or understanding with any
person to participate in the distribution of such New Notes, and (iii) if the
holder is not a broker-dealer, or is a broker-dealer but will not receive New
Notes for its own account in exchange for Old Notes. Neither the holder nor any
such other person is engaged in or intends to participate in the distribution of
such New Notes.
 
    Following the consummation of the Exchange Offer, holders of Old Notes not
tendered will no longer have certain registration rights and the Old Notes will
continue to be subject to certain restrictions on transfer. Accordingly, the
liquidity of the market for the Old Notes could be adversely affected.
 
TERMS OF THE EXCHANGE OFFER
 
    Upon the terms and subject to the conditions set forth in this Prospectus
and in the Letter of Transmittal, the Company and WinStar Equipment will accept
any and all Old Notes validly tendered and not withdrawn prior to 5:00 p.m., New
York City time, on the Expiration Date. Subject to the minimum denomination
requirements of the New Notes, the Company will issue $1,000 principal amount of
New Senior Notes in exchange for each $1,000 principal amount of outstanding Old
Senior Notes and WinStar Equipment will issue $1,000 principal amount of New
Equipment Notes in exchange for each $1,000 principal amount of outstanding Old
Equipment Notes accepted in the Exchange Offer. Holders may tender some or all
of their Old Notes pursuant to the Exchange Offer. However, Old Notes may be
tendered only in integral multiples of $1,000 principal amount.
 
                                       32

<PAGE>

    The forms and terms of the New Notes will be identical in all material
respects to the forms and terms of the corresponding Old Notes, except that the
New Notes will have been registered under the Securities Act and, therefore,
will not bear legends restricting the transfer thereof. The Exchange Offer is
not conditioned upon any minimum aggregate principal amount at maturity of Old
Notes being tendered for exchange. DTC is the sole registered holder of the Old
Notes, and holds such notes on behalf of numerous participants. This Prospectus,
together with the Letter of Transmittal, is being sent to all such registered
holders as of August 8, 1997.
 
    Holders of Old Notes do not have any appraisal or dissenters rights under
the 1997 Indentures in connection with the Exchange Offer. Each of the Company
and WinStar Equipment intends to conduct the Exchange Offer in accordance with
the applicable requirements of the Exchange Act and the applicable rules and
regulations of the Commission thereunder.
 
    Each of the Company and WinStar Equipment, as the case may be, shall be
deemed to have accepted validly tendered Old Notes when, as and if it has given
oral or written notice thereof to the Exchange Agent. The Exchange Agent will
act as agent for the tendering holders for the purpose of receiving the New
Notes from each of the Company and WinStar Equipment. If any tendered Old Notes
are not accepted for exchange, such unaccepted Old Notes will be returned,
without expense, to the tendering holder thereof as promptly as practicable
after the Expiration Date.
 
    Holders who tender Old Notes in the Exchange Offer will not be required to
pay brokerage commissions or fees or, subject to the instructions in the Letter
of Transmittal, transfer taxes with respect to the exchange of Old Notes
pursuant to the Exchange Offer. The Company will pay all charges and expenses,
other than certain applicable taxes, in connection with the Exchange Offer. See
" -- Fees and Expenses."
 
EXPIRATION DATE; EXTENSIONS; AMENDMENTS
 
    The term "Expiration Date" shall mean 5:00 p.m., New York City time, on
September 12, 1997, unless the Company in its sole discretion extends the
Exchange Offer, in which case the term "Expiration Date" shall mean the latest
date and time to which the Exchange Offer is extended. Although the Company has
no current intention to extend the Exchange Offer, the Company reserves the
right to extend the Exchange Offer at any time and from time to time by giving
oral or written notice to the Exchange Agent and by timely public announcement
communicated, unless otherwise required by applicable law or regulation, by
making a release to the Dow Jones News Service. During any extension of the
Exchange Offer, all Old Notes previously tendered pursuant to the Exchange Offer
and not withdrawn will remain subject to the Exchange Offer. The date of the
exchange of the New Notes for Old Notes will be the first New York Stock
Exchange trading day following the Expiration Date.
 
    Each of the Company and WinStar Equipment, as the case may be, expressly 
reserves the right to (i) terminate the Exchange Offer and not accept for 
exchange any Old Notes if any of the events set forth below under " 
- --Conditions to the Exchange Offer" shall have occurred and shall not have 
been waived by the Issuers and (ii) amend the terms of the Exchange Offer in 
any manner which, in its good faith judgment, is advantageous to the holders 
of the Old Notes, whether before or after any tender of the Old Notes.
 
PROCEDURES FOR TENDERING
 
    The tender to the Company or WinStar Equipment, as the case may be, of Old
Notes by a holder thereof pursuant to one of the procedures set forth below will
constitute an agreement between such holder and the Company and/or WinStar
Equipment, as the case may be, in accordance with the terms and subject to the
conditions set forth herein and in the Letter of Transmittal signed by such
holder. A holder of the Old Notes may tender such Old Notes by (i) properly
completing and signing a Letter of Transmittal or a facsimile thereof (all
references in this Prospectus to a Letter of Transmittal shall be deemed to
include a facsimile thereof) and delivering the same, together with any
corresponding certificate or certificates representing the Old Notes being
tendered (if in certificated form) and any required signature guarantees, to the
Exchange Agent at its address set forth in the Letter of Transmittal on or prior
to the Expiration Date (or complying with the procedure for book-entry transfer
described below) or (ii) complying with the guaranteed delivery procedures
described below.

                                       33

<PAGE>
 
    If tendered Old Notes are registered in the name of the signer of the Letter
of Transmittal and the New Notes to be issued in exchange therefor are to be
issued (and any untendered Old Notes are to be reissued) in the name of the
registered holder (which term, for the purposes described herein, shall include
any participant in DTC whose name appears on a security listing as the owner Of
Old Notes), the signature of such signer need not be guaranteed. In any other
case, the tendered Old Notes must be endorsed or accompanied by written
instruments of transfer in form satisfactory to the Company and duly executed by
the registered holder and the signature on the endorsement or instrument of
transfer must be guaranteed by a member firm of a registered national securities
exchange or of the National Association of Securities Dealers, Inc., a
commercial bank or trust company having an office or correspondent in the United
States or an "eligible guarantor institution" as defined by Rule 17Ad-15 under
the Exchange Act (any of the foregoing hereinafter referred to as an "Eligible
Institution"). If the New Notes and/or Old Notes not exchanged are to be
delivered to an address other than that of the registered holder appearing on
the register for the Old Notes, the signature in the Letter of Transmittal must
be guaranteed by an Eligible Institution.
 
    THE METHOD OF DELIVERY OF OLD NOTES, LETTER OF TRANSMITTAL AND ALL OTHER
DOCUMENTS IS AT THE ELECTION AND RISK OF THE HOLDER. IF SUCH DELIVERY IS BY
MAIL, IT IS RECOMMENDED THAT REGISTERED MAIL, PROPERLY INSURED, WITH RETURN
RECEIPT REQUESTED, BE USED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO
ASSURE TIMELY DELIVERY. NO LETTER OF TRANSMITTAL OR OLD NOTES SHOULD BE SENT TO
THE COMPANY OR WINSTAR EQUIPMENT.
 
    The Issuers understand that the Exchange Agent will make a request promptly
after the date of this Prospectus to establish accounts with respect to the Old
Notes at DTC for the purpose of facilitating the Exchange Offer, and subject to
the establishment thereof, any financial institution that is a participant in
DTC's system may make book-entry delivery of Old Notes by causing DTC to
transfer such Old Notes into the Exchange Agent's account with respect to the
Old Notes in accordance with DTC's procedure for such transfer. Although
delivery of the Old Notes may be effected through book-entry transfer into the
Exchange Agent's account at DTC, an appropriate Letter of Transmittal with any
required signature guarantee and all other required documents must in each case
be transmitted to and received or confirmed by the Exchange Agent at the address
set forth in the Letter of Transmittal on or prior to the Expiration Date, or,
if the guaranteed delivery procedures described below are complied with, within
the time period provided under such procedures.
 
    If the holder desires to accept the Exchange Offer and time will not permit
a Letter of Transmittal or Old Notes to reach the Exchange Agent before the
Expiration Date or the procedure for book-entry transfer cannot be completed on
a timely basis, a tender may be effected if the Exchange Agent has received at
its office, on or prior to the Expiration Date, a letter, telegram or facsimile
transmission from an Eligible Institution setting forth the name and address of
the tendering holder, the name(s) in which the Old Notes are registered and the
certificate number(s) of the Old Notes to be tendered, and stating that the
tender is being made thereby and guaranteeing that, within three New York Stock
Exchange trading days after the date of execution of such letter, telegram or
facsimile transmission by the Eligible Institution, such Old Notes, in proper
form for transfer (or a confirmation of book-entry transfer of such Old Notes
into the Exchange Agent's account at DTC), will be delivered by such Eligible
Institution together with a properly completed and duly executed Letter of
Transmittal (and any other required documents). Unless Old Notes being tendered
by the above-described method are deposited with the Exchange Agent within the
time period set forth above (accompanied or preceded by a properly completed
Letter of Transmittal and any other required documents), each of the Issuers
may, at its option, reject the tender. Copies of a Notice of Guaranteed Delivery
which may be used by Eligible Institutions for the purposes described in this
paragraph are available from the Exchange Agent.
 
    A tender will be deemed to have been received as of the date when (i) the
tendering holder's properly completed and duly signed Letter of Transmittal
accompanied by the Old Notes (or a confirmation of book-entry transfer of such
Old Notes into the Exchange Agent's account at DTC) is received by the Exchange
Agent or (ii) a Notice of Guaranteed Delivery or letter, telegram or facsimile
transmission to similar effect (as provided above) from an Eligible Institution
is received by the Exchange Agent. Issuances of New Notes in exchange for Old
Notes tendered pursuant to a Notice of Guaranteed Delivery or letter, telegram
or facsimile transmission to similar effect (as provided above) by an Eligible
Institution will be made only against submission of a duly signed Letter of
Transmittal (and any other required documents) and deposit of the tendered Old
Notes.

                                       34

<PAGE>

    All questions as to the validity, form, eligibility (including time of
receipt) and acceptance for exchange of any tender of Old Notes will be
determined by the Issuers, whose determination will be final and binding. The
Issuers reserve the absolute right to reject any or all tenders not in proper
form or the acceptance for exchange of which may, in the opinion of Issuers'
counsel, be unlawful. The Issuers also reserve the absolute right to waive any
of the conditions of the Exchange Offer or any defect or irregularity in the
tender of any Old Notes. None of the Company, WinStar Equipment, the Exchange
Agent or any other person will be under any duty to give notification of any
defects or irregularities in tenders or incur any liability for failure to give
any such notification. If any Old Notes received by the Exchange Agent are not
validly tendered and as to which the defects or irregularities have not been
cured or waived, or if Old Notes are submitted in a principal amount greater
than the principal amount of Old Notes being tendered by such tendering holder,
such unaccepted or non-exchanged Old Notes will be returned by the Exchange
Agent to the tendering holders, unless otherwise provided in the Letter of
Transmittal, as soon as practicable following the Expiration Date.
 
    In addition, each of the Company and WinStar Equipment reserves the right in
its sole discretion, to the extent permitted by the Senior Notes Indenture and
Equipment Note Indenture, as the case may be, to (a) purchase or make offers for
any Old Notes that remain outstanding subsequent to the Expiration Date and (b)
to the extent pertained by applicable law, purchase Old Notes in the open
market, in privately negotiated transactions or otherwise. The terms of any such
purchases or offers will differ from the terms of the Exchange Offer.
 
TERMS AND CONDITIONS OF THE LETTER OF TRANSMITTAL
 
    The Letter of Transmittal contains, among other things, the following terms
and conditions, which are part of the Exchange Offer.
 
    The party tendering Old Notes for exchange ("Transferor") exchanges, assigns
and transfers the Old Notes to the Company and WinStar Equipment, as the case
may be, and irrevocably constitutes and appoints the Exchange Agent as the
Transferor's agent and attorney-in-fact to cause the Old Notes to be assigned,
transferred and exchanged. The Transferor represents and warrants that it has
full power and authority to tender, exchange, assign and transfer the Old Notes
and to acquire New Notes issuable upon the exchange of such tendered Old Notes,
and that, when the same are accepted for exchange, the Company and WinStar
Equipment, as the case may be, will acquire good and unencumbered title to the
tendered Old Notes, free and clear of all liens, restrictions, charges and
encumbrances and not subject to any adverse claim. The Transferor also warrants
that it will, upon request, execute and deliver any additional documents deemed
by the Issuers to be necessary or desirable to complete the exchange, assignment
and transfer of tendered Old Notes or transfer ownership of such Old Notes on
the account books maintained by DTC. All authority conferred by the Transferor
will survive the death, bankruptcy or incapacity of the Transferor and every
obligation of the Transferor shall be binding upon the heirs, legal
representatives, successors, assigns, executors and administrators of such
Transferor.
 
    By executing a Letter of Transmittal, each holder will make to the Company
and WinStar Equipment, as the case may be, the representations set forth above
in the third paragraph under the heading " -- Purpose and Effect of the Exchange
Offer."
 
WITHDRAWAL OF TENDERS
 
    Tenders of Old Notes pursuant to the Exchange Offer are irrevocable, except
that Old Notes tendered pursuant to the Exchange Offer may be withdrawn at any
time prior to 5:00 p.m., New York City time, on the Expiration Date.
 
    To be effective, a written, telegraphic, or facsimile transmission notice of
withdrawal must be timely received by the Exchange Agent at the address set
forth in the Letter of Transmittal prior to 5:00 p.m., New York City time on the
Expiration Date. Any such notice of withdrawal must specify the holder named in
the Letter of Transmittal as having tendered Old Notes to be withdrawn, the
certificate numbers and designation of Old Notes to be withdrawn, the principal
amount of Old Notes delivered for exchange, a statement that such holder is
withdrawing his election to have such Old Notes exchanged, and the name of the
registered holder of such Old Notes, and must be signed by the holder in the
same manner as the original signature on the Letter of Transmittal (including
any 

                                       35

<PAGE>

required signature guarantees) or be accompanied by evidence satisfactory to 
the Company and WinStar Equipment, as the case may be, that the person 
withdrawing the tender has succeeded to the beneficial ownership of the Old 
Notes being withdrawn. The Exchange Agent will return the properly withdrawn 
Old Notes promptly following receipt of notice of withdrawal. If Old Notes 
have been tendered pursuant to the procedure for book-entry transfer, any 
notice of withdrawal must specify the name and number of the account at DTC 
to be credited with the withdrawn Old Notes or otherwise comply with DTC 
procedure. All questions as to the validity of notices of withdrawal, 
including time of receipt, will be determined by the Issuers and such 
determination will be final and binding on all parties.
 
CONDITIONS TO THE EXCHANGE OFFER
 
    Notwithstanding any other provision of the Exchange Offer, or any extension
of the Exchange Offer, the Issuers will not be required to issue New Notes in
exchange for any properly tendered Old Notes not theretofore accepted and may
terminate the Exchange Offer, or, at their option, modify or otherwise amend the
Exchange Offer, if either of the following events occur:
 
        (a) any statute, rule or regulation shall have been enacted, or any
    action shall have been taken by any court or governmental authority which,
    in the sole judgment of the Company, would prohibit, restrict or otherwise
    render illegal the consummation of the Exchange Offer, or

        (b) there shall occur a change in the current interpretation by the
    staff of the Commission which, in the Company's sole judgment, might
    materially impair the Company's or WinStar Equipment's ability to proceed
    with the Exchange Offer.
 
    Each of the Company and WinStar Equipment expressly reserves the right to
terminate the Exchange Offer and not accept for exchange any Old Notes upon the
occurrence of either of the foregoing conditions (which represent all of the
material conditions to the acceptance by the Company and WinStar Equipment, as
the case may be, of properly tendered Old Notes).
 
    The foregoing conditions are for the sole benefit of the Issuers and may be
waived by the Issuers if it is legally permitted to do so, in whole or in part,
in its sole discretion. The foregoing conditions must be either satisfied or
waived prior to termination of the Exchange Offer. Any determination made by the
Issuers concerning an event, development or circumstance described or referred
to above will be final and binding on all parties.
 
EXCHANGE AGENT
 
    U.S. Trust has been appointed as Exchange Agent for the Exchange Offer.
Questions and requests for assistance, requests for additional copies of this
Prospectus or of the Letter of Transmittal and requests for Notices of
Guaranteed Delivery should be directed to the Exchange Agent addressed as
follows:
 
    By Mail (registered or certified mail recommended): 

                      United States Trust Company of New York 
                      P.O. Box 844 
                      Cooper Station 
                      New York, New York 10276-0844 

By Overnight Courier: 

                      United States Trust Company of New York 
                      770 Broadway--13th Floor 
                      Corporate Trust Operations Department 
                      New York, New York 10003 
                      Attn: Corporate Trust Operations Department 

                                       36

<PAGE>


By Hand Delivery: 

                      United States Trust Company of New York 
                      111 Broadway, Lower Level 
                      New York, New York 10006 
                      Attn: Corporate Trust Services 



By Facsimile (for Eligible Institutions only): 

                      (212) 420-6152 
                      Confirm by telephone (800) 548-6565
 
FEES AND EXPENSES
 
    The expense of soliciting tenders will be borne by the Company. The
principal solicitation is being made by mail; however, additional solicitations
may be made by telegraph, telephone or in person by officers and regular
employees of the Company and its affiliates. No additional compensation will be
paid to any such officers and employees who engage in soliciting tenders.
 
    The Issuers have not retained any dealer-manager or other soliciting agent
in connection with the Exchange Offer and will not make any payments to brokers,
dealers or others soliciting acceptances of the Exchange Offer. The Company,
however, will pay the Exchange Agent reasonable and customary fees for its
services and will reimburse it for its reasonable out-of-pocket expenses in
connection therewith. The Company may also pay brokerage houses and other
custodians, nominees and fiduciaries the reasonable out-of-pocket expenses
incurred by them in forwarding copies of this Prospectus, the Letter of
Transmittal and related documents to the beneficial owners of the Old Notes and
in handling or forwarding tenders for exchange.
 
    The expenses to be incurred by the Company in connection with the Exchange
Offer, including fees and expenses of the Exchange Agent and Trustee and
accounting and legal fees, will be paid by the Company. The Company will not,
however, pay the costs incurred by a holder in delivering its Old Notes to the
Exchange Agent, underwriting fees, or Commissions or transfer taxes.
 
ACCOUNTING TREATMENT
 
    The New Notes will be recorded at the same carrying value as the Old 
Notes as reflected in the Company's accounting records on the date of the 
exchange because the exchange of the Old Notes for the New Notes is the 
completion of the selling process contemplated in the issuance of the Old 
Notes. Accordingly, no gain or loss for accounting purposes will be 
recognized. The expenses of the Exchange Offer and the unamortized expenses 
related to the issuance of the Old Notes will be amortized over the term of 
the New Notes.
 
OTHER MATTERS
 
    Participation in the Exchange Offer is voluntary and holders should
carefully consider whether to accept. Holders of the Old Notes are urged to
consult their financial and tax advisors in making their own decisions on what
action to take.
 
    No person has been authorized to give any information or to make any
representations in connection with the Exchange Offer other than those contained
in this Prospectus. If given or made, such information or representations should
not be relied upon as having been authorized by the Company. Neither the
delivery of this Prospectus nor any exchange made hereunder shall, under any
circumstances, create any implication that there has been no change in the
affairs of the Company since the respective dates as of which information is
given herein. The Exchange Offer is not being made to (nor will tenders be
accepted from or on behalf of) holders of Old Notes in any jurisdiction in which
the making of the Exchange Offer or the acceptance thereof would not be in
compliance with the laws of such jurisdiction. However, the Company may, at its
discretion, take such action as it may deem 

                                       37

<PAGE>

necessary to make the Exchange Offer in any such jurisdiction and extend the 
Exchange Offer to holders of Old Notes in such jurisdiction.
 
    As a result of the making of the Exchange Offer, the Issuers will have
fulfilled a covenant contained in the Registration Agreement. Holders of the Old
Notes who do not tender their Old Notes in the Exchange Offer will continue to
hold such Old Notes and will be entitled to all the rights and limitations
applicable thereto under the Senior Notes Indenture and Equipment Notes
Indenture, as the case may be, except for certain rights under the Registration
Agreement and except that certain of the Old Notes may not be entitled to the
contingent increase in interest rate provided for in the Old Notes. All
untendered Old Notes will continue to be subject to the restrictions on transfer
set forth in the Senior Notes Indenture and the Equipment Notes Indenture, as
the case may be, and the Old Notes. To the extent that Old Notes are tendered
and accepted in the Exchange Offer, the trading market, if any, for untendered
Old Notes could be adversely affected.
 
    Neither the Company nor WinStar Equipment will receive any cash proceeds
from the issuance of the New Notes offered hereby. In consideration for issuing
the New Notes as contemplated in this Prospectus, the Company will receive in
exchange Old Senior Notes, and WinStar Equipment will receive in exchange Old
Equipment Notes, in like principal amount, the terms of which are identical to
the New Senior Notes and New Equipment Notes, as the case may be, except that
such New Notes will be registered under the Securities Act and, therefore, will
not bear legends restricting the transfer thereof. Old Notes surrendered in
exchange for New Notes will be retired and canceled and cannot be reissued.
Accordingly, issuance of the New Notes will not result in a change in the
indebtedness of the Company or WinStar Equipment.
 
                                       38
<PAGE>
                                 CAPITALIZATION
 
    The following table sets forth the cash and capitalization of the continuing
operations of the Company as of March 31, 1997.
 
<TABLE>
<CAPTION>
                                                                                                  MARCH 31, 1997
                                                                                                 -----------------
                                                                                                  (IN THOUSANDS,
                                                                                                   EXCEPT SHARE
                                                                                                       DATA)
<S>                                                                                                 <C>
Cash, cash equivalents and short-term investments..............................................     $   413,474
                                                                                                       --------
                                                                                                       --------
Liabilities and stockholders' equity:
Current portion of long-term debt and capital lease obligations................................     $    23,095
                                                                                                       --------
 
Long-term debt and capital lease obligations:
  Equipment Notes..............................................................................         200,000
  Old Senior Notes.............................................................................         182,233
  Senior Notes.................................................................................         100,483
  Convertible Notes............................................................................          91,116
  Other notes..................................................................................             597
  Capital lease obligations, net of current portion............................................          12,991
                                                                                                       --------
    Total long-term debt and capital lease obligations.........................................         587,420
                                                                                                       --------
Stockholders' equity:
  Preferred Stock, $0.1 par value, 15,000,000 shares authorized, 4,000,000 shares issued and
    outstanding (with a liquidation preference of $100,000,000)................................              40
  Common Stock, $.01 par value, 75,000,000 shares authorized, 32,583,373 shares issued and
    outstanding(1).............................................................................             328
  Additional paid-in capital...................................................................         246,902
  Accumulated deficit..........................................................................        (167,010)
                                                                                                       --------
                                                                                                         80,260
    Unrealized loss on long term investments...................................................            (675)
                                                                                                       --------
  Total stockholders' equity...................................................................          79,585
                                                                                                       --------
      Total capitalization.....................................................................     $   690,100
                                                                                                       --------
                                                                                                       --------
</TABLE>
 
- ------------------------
 
(1) Does not include (i) an aggregate of 1,106,620 shares of Common Stock
    issuable upon exercise of options granted or which may be granted under the
    1992 Performance Equity Plan ("1992 Plan"), (ii) an aggregate of 3,500,000
    shares of Common Stock issuable upon exercise of options granted or which
    may be granted under the 1995 Performance Equity Plan ("1995 Plan") and
    (iii) 6,301,449 shares of Common Stock issuable upon exercise of other
    outstanding options and warrants. Also does not include shares issuable upon
    the conversion of the Convertible Preferred Stock and/or the Convertible
    Notes, nor dividends on Convertible Preferred Stock which were paid in kind
    on March 31, 1997. See "Description of Certain Indebtedness and Preferred
    Stock." The exercise and conversion prices of certain of the foregoing
    securities are below the current market price of the Common Stock as of the
    date of this Prospectus. Includes the issuance of 3,594,620 shares of Common
    Stock in connection with the Milliwave Acquisition. Also in June 1997, the
    shareholders of the Company approved an additional 4,000,000 shares of
    Common Stock issuable upon exercise of options which may be granted under
    the 1995 Plan, increasing the total shares which may be granted under the
    1995 Plan from 3,500,000 to 7,500,000. In June 1997, the Company authorized
    an additional 125,000,000 shares of Common Stock, increasing the authorized
    shares from 75,000,000 at March 31, 1997, to 200,000,000 at the date of this
    Prospectus.
 
                                       39
<PAGE>
                              DESCRIPTION OF NOTES
 
    The Old Senior Notes were issued in the 1997 Debt Placement under the Senior
Notes Indenture, dated as of March 1, 1997, between WinStar Communications, Inc.
(for the purposed of this Description of Notes, "WCI"), as issuer, and U.S.
Trust, as trustee (in such capacity, the "Senior Notes Trustee"). The Old
Equipment Notes were issued in the 1997 Debt Placement under the Equipment Notes
Indenture, dated as of March 1, 1997, between WinStar Equipment, as issuer, WCI,
as guarantor, and U.S. Trust, as trustee (in such capacity, the "Equipment Notes
Trustee" and, together with the Senior Notes Trustee, the "Trustees"). Any
references herein to a "Trustee" means the Senior Notes Trustee or the Equipment
Notes Trustee, as the context may require. Copies of the forms of 1997
Indentures are available on request from WCI.
 
    The New Senior Notes will be issued under the Senior Notes Indenture and the
New Equipment Notes will be issued under the Equipment Notes Indenture. The form
and terms of the New Notes are the same as the form and terms of the Old Notes,
except that the New Notes will have been registered under the Securities Act,
and therefore, will not bear legends restricting transfer thereof. The New
Senior Notes and New Equipment Notes will evidence the same debt as the Old
Senior Notes and Old Equipment Notes. Upon consummation of the Exchange
Offering, the New Senior Notes will be treated as a single class under the
Senior Notes Indenture with any Old Senior Notes remaining outstanding, and the
New Equipment Notes will be treated as a single class under the Equipment Notes
Indenture with any Old Equipment Notes remaining outstanding. Upon the
consummation of the Exchange Offer, holders of Old Notes may not be entitled to
certain registration rights under, or the contingent increase in interest rate
provided by, the Registration Agreement.
 
    The term "Senior Notes" used herein refers to both Old Senior Notes and New
Senior Notes and the term "Equipment Notes" used herein refers to both Old
Equipment Notes and New Equipment Notes. The term "Notes" or "1997 Notes" refers
to both Senior Notes and Equipment Notes.
 
GENERAL
 
    The New Notes will be issued only in fully registered form, without coupons,
in denominations of $1,000 of principal amount and any integral multiple of
$1,000. See "--Book-Entry, Delivery and Form." No service charge will be made
for any registration of transfer or exchange of Notes, but WCI may require
payment of a sum sufficient to cover any transfer tax or other similar
governmental charge payable in connection therewith. The Notes may be exchanged
or transferred at the office or agency of WCI in the Borough of Manhattan, The
City of New York (which initially will be the corporate trust office of the
Trustee at 114 West 47th Street, New York, New York 10036-1532).
 
    Although for United States federal income tax purposes a significant amount
of original issue discount, taxable as ordinary income, will be recognized by a
Holder of Senior Notes as such discount is amortized from the date of issuance
of the Senior Notes, Holders of Senior Notes will not receive any payments on
the Senior Notes until April 15, 2001. For a description of certain tax matters
related to an investment in the Notes, see "Certain United States Federal Income
Tax Considerations."
 
TERMS OF THE NOTES
 
    SENIOR NOTES
 
    The Senior Notes are unsecured senior obligations of WCI, limited to 
$100.0 million aggregate principal amount, and will mature on October 15, 
2005. Until October 15, 2000, interest on the Senior Notes accrues at a rate 
of 14 1/2% per annum and will be compounded semiannually on each SemiAnnual 
Interest Accrual Date with respect to the Senior Notes, but, except as 
described herein, will not be payable in cash. From and after October 15, 
2000, interest on the Accumulated Amount of each Senior Note will be paid 
semiannually to Holders of record at the close of business on the April 1 or 
October 1 immediately preceding the interest payment date of April 15 and 
October 15 of each year, commencing April 15, 2001.

                                       40

<PAGE>
 
    EQUIPMENT NOTES
 
    The Equipment Notes are secured senior obligations of WinStar Equipment,
limited to $200.0 million aggregate principal amount, and will mature on March
15, 2004. Interest on the Equipment Notes accrues at a rate of 12 1 % per 2
annum and will be paid semiannually to Holders of record at the close of
business on the March 1 or September 1 immediately preceding the interest
payment date of March 15 and September 15 of each year, commencing September 15,
1997.
 
OPTIONAL REDEMPTION
 
    SENIOR NOTES
 
    The Senior Notes are not redeemable prior to October 15, 2000. Thereafter,
the Senior Notes will be redeemable, at WCI's option, in whole at any time, or
in part from time to time, upon not less than 30 nor more than 60 days' prior
notice mailed by first-class mail to each Holder's registered address, at the
following redemption prices (expressed as a percentage of the Accumulated Amount
of the New Senior Notes), plus accrued and unpaid interest, if any, on such
Accumulated Amount to the redemption date (subject to the right of Holders of
record on the relevant regular record date that is on or prior to the redemption
date to receive interest due on the relevant interest payment date), if redeemed
during the 12-month period commencing October 15 of the years set forth below:
 
<TABLE>
<CAPTION>
                                                          SENIOR NOTE
                                                          REDEMPTION
YEAR                                                         PRICE
- ----                                                      -----------
<S>                                                       <C>
2000...................................................     107.250%
2001...................................................     104.833
2002...................................................     102.417
2003 and thereafter....................................     100.000

</TABLE>
 
EQUIPMENT NOTES
 
    The Equipment Notes are not redeemable prior to March 15, 2002, except as
discussed below under "--Mandatory Redemption of Equipment Notes." On and after
March 15, 2002, the New Equipment Notes will be redeemable, at WinStar
Equipment's option, in whole at any time, or in part from time to time, upon not
less than 30 nor more than 60 days' prior notice mailed by first-class mail to
each Holder's registered address, at the following redemption prices (expressed
as a percentage of principal amount), plus accrued and unpaid interest, if any,
to the redemption date (subject to the right of Holders of record on the
relevant regular record date that is on or prior to the redemption date to
receive interest due on the relevant interest payment date), if redeemed during
the 12-month period commencing March 15 of the years set forth below:
 
<TABLE>
<CAPTION>
                                                          EQUIPMENT
                                                       NOTE REDEMPTION
YEAR                                                        PRICE
- ----                                                  ----------------
<S>                                                     <C>
2002..............................................        106.250%
2003..............................................        103.125

</TABLE>
 
SELECTION OF NOTES FOR OPTIONAL REDEMPTION
 
    In the case of any partial optional redemption, selection of the Senior 
Notes or Equipment Notes, as the case may be, for redemption will be made by 
the relevant Trustee in compliance with the requirements of the principal 
national securities exchange, if any, on which such Notes are listed or, if 
such Notes are not listed on a national securities exchange, on a pro rata 
basis, by lot or such other method as such Trustee, in its sole discretion, 
shall deem fair and appropriate; provided, however, that no Note of $1,000 in 
principal amount or less shall be redeemed in part. 

                                       41

<PAGE>

If any Note is to be redeemed in part only, the notice of redemption relating 
to such Note shall state the portion of the principal amount thereof to be 
redeemed. A replacement Senior Note or Equipment Note, as the case may be, in 
principal amount equal to the unredeemed portion thereof will be issued in 
the name of the Holder thereof upon cancellation of the original New Senior 
Note or New Equipment Note, as the case may be.
 
    WCI's and WinStar Equipment's ability to redeem the 1997 Notes at their
option is severely limited under the 1995 Indentures. WCI may not be able to
redeem the Notes at its option unless it simultaneously redeems all of the 1995
Notes.
 
MANDATORY REDEMPTION OF EQUIPMENT NOTES
 
    In the event that by March 18, 1999, WinStar Equipment shall not have
applied at least $200.0 million to fund the Acquisition Costs of Designated
Equipment pursuant to the covenant described below under "--Covenants--Covenants
Relating to the Equipment Notes--Use of Proceeds" ($200.0 million less the
amount so applied being herein called the "Unused Equipment Amount"), WinStar
Equipment shall redeem Equipment Notes in an aggregate principal amount equal to
the Unused Equipment Amount at a redemption price of 112.50% of such principal
amount, plus accrued and unpaid interest thereon to the redemption date (subject
to the right of Holders of record on the relevant record date that is on or
prior to the redemption date to receive interest due on the relevant interest
payment date). The mandatory redemption described herein shall occur no later
than April 2, 1999.
 
    Selection of the Equipment Notes for mandatory redemption will be made on a
pro rata basis; provided, however, that no Equipment Note of $1,000 in principal
amount or less shall be redeemed in part. If any Note is to be redeemed in part
only, a new Equipment Note in principal amount equal to the unredeemed portion
thereof will be issued in the name of the Holder thereof upon cancellation of
the original Equipment Note.
 
EQUIPMENT NOTE GUARANTEE
 
    WCI, as primary obligor and not merely as surety, has irrevocably and
unconditionally guaranteed (the "Equipment Note Guarantee") on a senior
unsecured basis the performance and punctual payment when due, whether at Stated
Maturity, by acceleration or otherwise, of all obligations of WinStar Equipment
under the Equipment Notes Indenture and the Equipment Notes, whether for
principal of or interest on the Equipment Notes, expenses, indemnifications or
otherwise (all such obligations guaranteed by WCI pursuant to the Equipment Note
Guarantee being herein called the "Guaranteed Obligations"). WCI has agreed to
pay, on a senior unsecured basis and in addition to the amount stated above, any
and all expenses (including reasonable counsel fees and expenses) incurred by
the Equipment Notes Trustee or the Holders of Equipment Notes in enforcing any
rights under the Equipment Note Guarantee with respect to WCI.
 
    The Equipment Note Guarantee is a continuing guarantee and shall (i) remain
in full force and effect until payment in full of all the Guaranteed
Obligations, (ii) be binding upon WCI and (iii) enure to the benefit of and be
enforceable by the Equipment Notes Trustee, the Holders of Equipment Notes and
their successors, transferees and assigns.
 
SECURITY FOR THE EQUIPMENT NOTES
 
    Pursuant to the Equipment Notes Indenture and related documents, 
including the Security Agreement, between WinStar Equipment and the Equipment 
Notes Trustee, the Equipment Notes Trustee, for its benefit and the benefit 
of the Holders of the Equipment Notes, receives a security interest in: (i) 
all Designated Equipment acquired by WinStar Equipment pursuant to the 
covenant described below under "--Covenants--Covenants Relating to the 
Equipment Notes--Use of Proceeds;" (ii) the proceeds of any sale or other 
disposition of such Designated Equipment (including any insurance proceeds 
from the loss or destruction of such Designated Equipment); and (iii) any 
additional Designated Equipment acquired by WinStar Equipment with the 
proceeds of any such sale or other disposition of Designated Equipment 
(collectively, the "Collateral").
 
    If the Equipment Notes become due and payable prior to their Stated Maturity
or are not paid in full at the Stated Maturity thereof, the Equipment Notes
Trustee, on behalf of the Holders of the Equipment Notes, in addition 

                                       42

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to any other rights or remedies available to it under the Equipment Notes 
Indenture, may take such action as it deems advisable to protect and enforce 
the rights of the Trustee and such Holders in the Collateral, including the 
institution of foreclosure proceedings. Any proceeds received by the Trustee 
from the disposition of the Collateral will be applied by the Trustee, first 
to pay certain expenses of the Trustee and the Holders of the Equipment 
Notes, second to pay interest with respect to the Equipment Notes, third to 
pay unpaid principal of the Equipment Notes, fourth to pay costs and expenses 
of, and all premiums on, and all other amounts due under, the Equipment 
Notes, and finally, to pay any remainder to WinStar Equipment or as a court 
of competent jurisdiction otherwise directs.
 
    The right of the Equipment Notes Trustee to repossess and dispose of the
Collateral upon the occurrence of an Event of Default is likely to be
significantly impaired by applicable bankruptcy law if a bankruptcy proceeding
were to be commenced by or against WinStar Equipment prior to the Equipment
Notes Trustee's having disposed of the Collateral. Under Title XI of the United
States Code (the "Bankruptcy Code"), a secured creditor such as the Trustee is
prohibited from disposing of security repossessed from a debtor in a bankruptcy
case without bankruptcy court approval. Moreover, the Bankruptcy Code prohibits
a secured creditor from disposing of collateral even though the debtor is in
default under the applicable debt instruments if the secured creditor is given
"adequate protection." The meaning of the term "adequate protection" may vary
according to circumstances, but it is intended in general to protect the value
of the secured creditor's interest in the collateral and may include cash
payments or the granting of additional security, if and at such times as the
court in its discretion determines, for any diminution in the value of the
collateral as a result of the stay of disposition during the pendency of the
bankruptcy case. In view of the lack of a precise definition of the term
"adequate protection" and the broad discretionary powers of a bankruptcy court,
it is impossible to predict how long payments under the Equipment Notes could be
delayed following commencement of a bankruptcy case, whether or when the
Equipment Notes Trustee could dispose of the Collateral or whether or to what
extent Holders would be compensated for any delay in payment or loss of value of
the Collateral through the requirement of "adequate protection."
 
    In addition, notwithstanding anything to the contrary described above,
unless an Event of Default shall have occurred and be continuing, WinStar
Equipment will have the right to remain in possession of and retain exclusive
control of the Collateral, will have the right to freely utilize the Collateral
(including the right to lease such Collateral) and will have the right to
collect, invest and dispose of any income thereon. Upon any foreclosure by the
Equipment Notes Trustee, on behalf of Holders of the Equipment Notes, on any
Collateral that has been made the subject of a lease by WinStar Equipment, the
Equipment Notes Trustee's ability to dispose of such Collateral may be
restricted by the terms of such lease arrangement. See "Risk Factors--Failure to
Maintain Perfected Security Interest."
 
    Collateral may be released from the liens of the Equipment Notes Indenture
in connection with an Asset Sale of Designated Equipment, in which case WinStar
Equipment will be required to comply with the covenant described below under
"--Covenants--Covenants Relating to All the Notes--Limitation on Asset Sales."

RANKING
 
    SENIOR NOTES AND EQUIPMENT NOTE GUARANTEE
 
    The indebtedness evidenced by the Senior Notes and the Equipment Note
Guarantee are unsecured senior obligations of WCI, ranks PARI PASSU in right of
payment with all existing and future senior indebtedness of WCI, including the
1995 Senior Notes, and is senior in right of payment to all existing and future
subordinated indebtedness of WCI, including the Convertible Notes.
 
    At March 31, 1997, after giving effect to the issuance of the Old Notes, WCI
would have had (on an unconsolidated basis) approximately $600.0 million of
indebtedness (including the Equipment Note Guarantee), $508.9 million of which
would have been senior indebtedness, and there would have been no indebtedness
junior to the Senior Notes and the 1995 Senior Notes, other than the Convertible
Notes.
 
    WCI IS A HOLDING COMPANY.  Substantially all the operations of WCI are
conducted through its subsidiaries. Claims of creditors of such subsidiaries,
including trade creditors, secured creditors and creditors holding indebtedness
and guarantees issued by such subsidiaries, and claims of preferred stockholders
(if any) of such subsidiaries, generally will have priority with respect to the
assets and earnings of such subsidiaries over the claims of creditors of WCI,

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<PAGE>

including holders of the Senior Notes and the Equipment Note Guarantee. The
Senior Notes and the Equipment Note Guarantee, therefore, would be effectively
subordinated to creditors (including trade creditors) and preferred stockholders
(if any) of subsidiaries of WCI (subject in the case of the Equipment Note
Guarantee, however, to a Holder's direct claim against WinStar Equipment). At
March 31, 1997, after giving effect to the issuance of the Notes, the total
liabilities of WCI's subsidiaries were approximately $258.8 million, including
trade payables and the Equipment Notes. Although the Indentures limit the
incurrence of Indebtedness and the issuance of preferred stock of certain of
WCI's subsidiaries, such limitations are subject to a number of significant
qualifications. Moreover, the Indentures do not impose any limitation on the
incurrence by such subsidiaries of liabilities that are not considered
Indebtedness under the Indentures.
 
    The Senior Notes Indenture specifically designates the Senior Notes as, and
the Equipment Notes Indenture specifically designates the Equipment Note
Guarantee as, "Designated Senior Indebtedness" for purposes of the Convertible
Notes Indenture (as defined).
 
    EQUIPMENT NOTES
 
    The indebtedness evidenced by the Equipment Notes are secured senior
obligations of WinStar Equipment. As of the Closing Date, there was no
indebtedness of WinStar Equipment other than the Equipment Notes. Under the
Equipment Notes Indenture, WinStar Equipment is prohibited from incurring any
additional Indebtedness (other than certain refinancing indebtedness in respect
of the Equipment Notes). See "--Covenants--Covenants Relating to the Equipment
Notes--Business Activities."
 
REGISTRATION RIGHTS
 
    The Registration Statement of which this Prospectus forms a part, has been
filed by WCI and WinStar Equipment pursuant to the Registration Agreement. Under
the terms of the Registration Agreement, the Issuers will be entitled to close
the Exchange Offer 30 days after the commencement thereof provided that they
have accepted all Old Notes theretofore validly tendered in accordance with the
terms of such Exchange Offer. After consummation of the Exchange Offer, the
Issuers will have no further obligation to make any other such exchange offers.
 
REPURCHASE OF NOTES UPON A CHANGE OF CONTROL
 
    Each of WCI and WinStar Equipment must commence, within 30 days of the
occurrence of a Change of Control, and consummate an Offer to Purchase for all
of its respective Notes then outstanding, at a purchase price equal to 101% of,
in the case of the Senior Notes, the Accumulated Amount of such Notes on the
date of purchase, and, in the case of the Equipment Notes, the principal amount
of such Notes, plus, in each case, accrued and unpaid interest (if any) on such
amount to the date of purchase. Prior to the mailing of the notice to Holders of
Notes commencing such Offer to Purchase, but in any event within 30 days
following any Change of Control, WCI covenants to (i) repay in full all
indebtedness of WCI and WinStar Equipment that would prohibit the repurchase of
the Notes pursuant to such Offer to Purchase or (ii) obtain any requisite
consents under instruments governing any such indebtedness of WCI and WinStar
Equipment to permit the repurchase of the Notes. WCI shall first comply with the
covenant in the preceding sentence before it shall repurchase Notes pursuant to
this "Repurchase of Notes Upon a Change of Control" covenant.
 
    If WCI is unable to repay all of its indebtedness that would prohibit
repurchase of the Notes or is unable to obtain the consents of the holders of
indebtedness, if any, outstanding at the time of a Change of Control whose
consent would be so required to permit the repurchase of Notes or otherwise
fails to purchase any Notes validly tendered, then WCI will have breached such
covenant. This breach will constitute an Event of Default under the relevant
Indenture if it continues for a period of 30 consecutive days after written
notice is given to WCI by the relevant Trustee or the Holders of at least 25% in
aggregate principal amount of the Senior Notes or the Equipment Notes, as the
case may be, outstanding. In addition, the failure by WCI and WinStar Equipment
to repurchase Notes at the conclusion of the Offer to Purchase will constitute
an Event of Default without any waiting period or notice requirements.
 
                                       44

<PAGE>

    There can be no assurance that WCI or WinStar Equipment will have 
sufficient funds available at the time of any Change of Control to make any 
debt payment (including repurchases of Notes) required by the foregoing 
covenant (as well as may be contained in other securities of WCI or WinStar 
Equipment which might be outstanding at the time). The above covenant 
requiring WCI or WinStar Equipment to repurchase the Notes will, unless the 
consents referred to above are obtained, require WCI or WinStar Equipment to 
repay all indebtedness then outstanding which by its terms would prohibit 
such Note repurchase, either prior to or concurrently with such Note 
repurchase.
 
COVENANTS
 
COVENANTS RELATING TO ALL THE NOTES
 
    LIMITATION ON INDEBTEDNESS
 
    (a) Under the terms of each of the Indentures, WCI will not, and will not 
permit any of its Restricted Subsidiaries to, Incur any Indebtedness (other 
than the Notes and Indebtedness existing on the Closing Date); provided, 
however, that WCI may Incur Indebtedness if, after giving effect to the 
Incurrence of such Indebtedness and the receipt and application of the 
proceeds therefrom, the Indebtedness to EBITDA Ratio would be greater than 
zero and less than 5:1.
 
    Notwithstanding the foregoing, WCI and any Restricted Subsidiary (except 
as specified below) may Incur each and all of the following: (i) Indebtedness 
of WCI outstanding at any time in an aggregate principal amount not to exceed 
$125.0 million, less any amount of Indebtedness Incurred pursuant to this 
clause (i) and permanently repaid as provided under "--Limitation on Asset 
Sales" below; (ii) Indebtedness (A) to WCI evidenced by an unsubordinated 
promissory note or (B) to any of its Restricted Subsidiaries; provided, 
however, that any event which results in any such Restricted Subsidiary 
ceasing to be a Restricted Subsidiary or any subsequent transfer of such 
Indebtedness (other than to WCI or another Restricted Subsidiary) shall be 
deemed, in each case, to constitute an Incurrence of such Indebtedness not 
permitted by this clause (ii); (iii) Indebtedness issued in exchange for, or 
the net proceeds of which are used to refinance or refund, then outstanding 
Indebtedness, other than Indebtedness Incurred under clause (i), (ii), (v), 
(vi) or (viii) of this paragraph, and any refinancings thereof in an amount 
not to exceed the amount so refinanced or refunded (plus premiums, accrued 
interest, fees and expenses); provided, however , that Indebtedness the 
proceeds of which are used to refinance or refund the Senior Notes or the 
Equipment Notes, as the case may be, or Indebtedness that is PARI PASSU with, 
or subordinated in right of payment to, the Senior Notes or the Equipment 
Note Guarantee, as the case may be, shall only be permitted under this clause 
(iii) if (A) in case the Senior Notes or the Equipment Notes, as the case may 
be, are refinanced in part or the Indebtedness to be refinanced is PARI PASSU 
with the Senior Notes or the Equipment Note Guarantee, as the case may be, 
such new Indebtedness, by its terms or by the terms of any agreement or 
instrument pursuant to which such new Indebtedness is outstanding, is 
expressly made PARI PASSU with, or subordinate in right of payment to, the 
remaining Senior Notes or the Equipment Note Guarantee, as the case may be, 
(B) in case the Indebtedness to be refinanced is subordinated in right of 
payment to the Senior Notes or the Equipment Note Guarantee, as the case may 
be, such new Indebtedness, by its terms or by the terms of any agreement or 
instrument pursuant to which such new Indebtedness is outstanding, is 
expressly made subordinate in right of payment to the Senior Notes or the 
Equipment Note Guarantee, as the case may be, at least to the extent that the 
Indebtedness to be refinanced is subordinated to the Senior Notes or the 
Equipment Note Guarantee, as the case may be, and (C) such new Indebtedness, 
determined as of the date of Incurrence of such new Indebtedness, does not 
mature prior to the Stated Maturity of the Indebtedness to be refinanced or 
refunded, and the Average Life of such new Indebtedness is at least equal to 
the remaining Average Life of the Indebtedness to be refinanced or refunded; 
provided further, however, that in no event may Indebtedness of WCI be 
refinanced by means of any Indebtedness of any Restricted Subsidiary of WCI 
pursuant to this clause (iii); (iv) Indebtedness (A) in respect of 
performance, surety or appeal bonds provided in the ordinary course of 
business, (B) under Currency Agreements and Interest Rate Agreements; 
provided, however, that such agreements do not increase the Indebtedness of 
the obligor outstanding at any time other than as a result of fluctuations in 
foreign currency exchange rates or interest rates or by reason of fees, 
indemnities and compensation payable thereunder, and (C) arising from 
agreements providing for indemnification, adjustment of purchase price or 
similar obligations, or from Guarantees or letters of credit, surety bonds or 
performance bonds securing any obligations of WCI or any of the Restricted    

                                    45 

<PAGE> 

Subsidiaries pursuant to such agreements, in any case Incurred in connection 
with the disposition of any business, assets or Restricted Subsidiary of WCI 
(other than Guarantees of Indebtedness Incurred by any Person acquiring all 
or any portion of such business, assets or Restricted Subsidiary of WCI for 
the purpose of financing such acquisition), in a principal amount not to 
exceed the gross proceeds actually received by WCI or any Restricted 
Subsidiary in connection with such disposition; (v) Indebtedness of WCI not 
to exceed, at any one time outstanding, two times the Net Cash Proceeds 
received by WCI from and after October 23, 1995 from the issuance and sale of 
its Capital Stock (other than Redeemable Stock and Preferred Stock that 
provides for the payment of dividends in cash); provided, however, that such 
Indebtedness (x) does not mature prior to the Stated Maturity of the Notes 
and has an Average Life longer than the Notes and (y) is subordinated to the 
Senior Notes and the Equipment Note Guarantee at least to the extent that the 
Convertible Notes are subordinated to Senior Indebtedness (as defined in the 
Convertible Notes Indenture); (vi) Indebtedness of any Restricted Subsidiary 
Incurred pursuant to any credit agreement of such Restricted Subsidiary in 
effect on the Closing Date (and refinancings thereof), up to the amount of 
the commitment under such credit agreement on the Closing Date; (vii) 
Indebtedness to the extent such Indebtedness is secured by Liens which are 
purchase money or other Liens upon equipment or inventory acquired or held by 
WCI or any of its Restricted Subsidiaries taken or obtained by (A) the seller 
or lessor of such equipment or inventory to secure all or a part of the 
purchase price or lease payments therefor or (B) the person who makes 
advances or incurs obligations, thereby giving value to WCI to enable it to 
purchase or acquire rights in such equipment or inventory, to secure the 
repayment of all or a part of the advances so made or obligations so 
incurred; provided, however, that such Liens do not extend to or cover any 
property or assets of WCI or any Restricted Subsidiary other than the 
equipment or inventory acquired; (viii) Indebtedness of any Restricted 
Subsidiary not to exceed, at any one time outstanding, 80% of the accounts 
receivable net of reserves and allowances for doubtful accounts, determined 
in accordance with GAAP, of such Restricted Subsidiary and its Restricted 
Subsidiaries (without duplication); provided, however, that such Indebtedness 
is not Guaranteed by WCI or any of its Restricted Subsidiaries; and (ix) 
Indebtedness of WCI, to the extent the proceeds thereof are immediately used 
to purchase Notes tendered in an Offer to Purchase made as a result of a 
Change of Control.
 
    (b) For purposes of determining any particular amount of Indebtedness 
under this "Limitation on Indebtedness" covenant, Guarantees, Liens or 
obligations with respect to letters of credit supporting Indebtedness 
otherwise included in the determination of such particular amount shall not 
be included. For purposes of determining compliance with this "Limitation on 
Indebtedness" covenant, in the event that an item of Indebtedness meets the 
criteria of more than one of the types of Indebtedness described in the above 
clauses, WCI, in its sole discretion, shall classify such item of 
Indebtedness and only be required to include the amount and type of such 
Indebtedness in one of such clauses.
 
    (c) WCI will not, and will not permit any Restricted Subsidiary to, Incur 
any Guarantee of Indebtedness of any Unrestricted Subsidiary.
 
    LIMITATION ON RESTRICTED PAYMENTS
 
    Under the terms of each of the Indentures, WCI will not, and will not 
permit any Restricted Subsidiary to, directly or indirectly, (i) declare or 
pay any dividend or make any distribution on its Capital Stock (other than 
dividends or distributions payable solely in shares of its or such Restricted 
Subsidiary's Capital Stock (other than Redeemable Stock) held by such holders 
or in options, warrants or other rights to acquire such shares of Capital 
Stock) other than such Capital Stock held by WCI or any of its Restricted 
Subsidiaries (and other than pro rata dividends or distributions on Common 
Stock of Restricted Subsidiaries), (ii) repurchase, redeem, retire or 
otherwise acquire for value any shares of Capital Stock of WCI (including 
options, warrants or other rights to acquire such shares of Capital Stock) 
held by Persons other than any Wholly Owned Restricted Subsidiaries of WCI, 
(iii) make any voluntary or optional principal payment, or voluntary or 
optional redemption, repurchase, defeasance, or other acquisition or 
retirement for value, of Indebtedness of WCI that is subordinated in right of 
payment to the Senior Notes or the Equipment Note Guarantee, as the case may 
be, or (iv) make any Investment, other than a Permitted Investment, in any 
Person (such payments or any other actions described in clauses (i) through 
(iv) being collectively "Restricted Payments") if, at the time of, and after 
giving effect to, the proposed Restricted Payment: (A) a Default or Event of 
Default shall have occurred and be continuing, (B) except with respect to any 
Investment (other than an Investment consisting of the designation of a 
Restricted Subsidiary as an Unrestricted Subsidiary), WCI could not Incur at 
least $1.00 of Indebtedness under the first paragraph of the "Limitation on 
Indebtedness" covenant or (C) the aggregate amount expended for all 
Restricted Payments (the amount so expended, if other than in cash, to be 
determined in good faith by the Board of Directors, whose determination shall 
be conclusive and evidenced by a Board Resolution) after the Closing Date 
shall exceed the sum of (1) 50% of the aggregate amount of the Adjusted 
Consolidated Net Income 
                                       
                                       46

<PAGE>

(or, if the Adjusted Consolidated Net Income is a loss, minus 100% of such 
amount) (determined by excluding income resulting from transfers of assets by 
WCI or a Restricted Subsidiary to an Unrestricted Subsidiary) accrued on a 
cumulative basis during the period (taken as one accounting period) beginning 
on the first day of the fiscal quarter immediately following the Closing Date 
and ending on the last day of the last fiscal quarter preceding the 
Transaction Date for which reports have been filed pursuant to "--SEC Reports 
and Reports to Holders" plus (2) the aggregate Net Cash Proceeds received by 
WCI after the Closing Date from the issuance and sale permitted by the 
Indentures of its Capital Stock (other than Redeemable Stock) to a Person who 
is not a Subsidiary of WCI, or from the issuance to a Person who is not a 
Subsidiary of WCI of any options, warrants or other rights to acquire Capital 
Stock of WCI (in each case, exclusive of any convertible Indebtedness, 
Redeemable Stock or any options, warrants or other rights that are redeemable 
at the option of the holder, or are required to be redeemed, prior to the 
Stated Maturity of the Senior Notes or the Equipment Notes, as the case may 
be) plus (3) an amount equal to the net reduction in Investments (other than 
reductions in Permitted Investments and other than reductions in Investments 
made pursuant to clauses (vi) or (vii) of the second paragraph of this 
"Limitation on Restricted Payments" covenant) in any Person resulting from 
payments of interest on Indebtedness, dividends, repayments of loans or 
advances, or other transfers of assets, in each case to WCI or any Restricted 
Subsidiary (except to the extent any such payment is included in the 
calculation of Adjusted Consolidated Net Income), or from redesignations of 
Unrestricted Subsidiaries as Restricted Subsidiaries (valued in each case as 
provided in the definition of "Investments"), not to exceed the amount of 
Investments previously made by WCI and its Restricted Subsidiaries in such 
Person.
 
    The foregoing provision shall not be violated by reason of: (i) the 
payment of any dividend within 60 days after the date of declaration thereof 
if, at said date of declaration, such payment would comply with the foregoing 
paragraph; (ii) the redemption, repurchase, defeasance or other acquisition 
or retirement for value of Indebtedness that is subordinated in right of 
payment to the Senior Notes or the Equipment Note Guarantee, as the case may 
be, including premium, if any, and accrued and unpaid interest, with the 
proceeds of, or in exchange for, Indebtedness Incurred under clause (iii) of 
the second paragraph of the covenant described under "--Limitation on 
Indebtedness;" (iii) the repurchase, redemption or other acquisition of 
Capital Stock of WCI (or options, warrants or other rights to acquire such 
Capital Stock) in exchange for, or out of the proceeds of a substantially 
concurrent sale of, shares of Capital Stock or options, warrants or other 
rights to acquire such Capital Stock (in each case other than Redeemable 
Stock) of WCI; (iv) the making of any other Restricted Payment made by 
exchange for, or out of the proceeds of, a substantially concurrent sale of, 
shares of the Capital Stock or options, warrants or other rights to acquire 
such Capital Stock (in each case other than Redeemable Stock) of WCI; (v) 
payments or distributions, in the nature of satisfaction of dissenters' 
rights, pursuant to or in connection with a consolidation, merger or
transfer of assets that complies with the provisions of the applicable Indenture
applicable to mergers, consolidations and transfers of all or substantially all
of the property and assets of WCI; (vi) Investments, not to exceed $15 million
at any one time outstanding; (vii) Investments, not to exceed $15 million at any
one time outstanding, in entities, substantially all of the assets of which
consist of Telecommunications Assets; (viii) (A) cash payments in lieu of the
issuance of fractional shares of Common Stock upon conversion (including
mandatory conversion) of the Convertible Notes provided for in the Convertible
Notes Indenture and (B) cash payments on the Convertible Notes required to be
made under the provisions of the Convertible Notes Indenture that relate to
repurchases of Convertible Notes upon a change of control and that relate to
limitations on sales of assets; (ix) cash payments in lieu of the issuance of
fractional shares of Common Stock of WCI upon conversion of any class of
Preferred Stock of WCI; provided, however, that this exception shall not be
available with respect to more than two such conversions with respect to any
such class of Preferred Stock by any given Affiliate of WCI; and (x) Investments
in entities that directly (or indirectly through subsidiaries) own licenses
granted by the FCC or any other governmental entity with authority to grant
telecommunications licenses; provided, however, that, in each case WCI or a
Restricted Subsidiary shall, at the time of making such Investment, have an
active role in the management or operation of such entity and in the provision
of telecommunications services by such entity; provided, however, that, except
in the case of clauses (i) and (iii) of this paragraph, no Default or Event of
Default shall have occurred and be continuing or occur as a consequence of the
actions or payments set forth herein. Any Investments made other than in cash
shall be valued, in good faith, by the Board of Directors. Any Investment made
pursuant to clause (vi) or (vii) of this paragraph shall be deemed to be no
longer outstanding (and repaid in full) if and when the Person in which such
Investment is made becomes a Restricted Subsidiary of WCI.
 
    Each Restricted Payment permitted pursuant to the preceding paragraph (other
than the Restricted Payment referred to in clause (ii) thereof), and the Net
Cash Proceeds from any issuance and sale of Capital Stock referred to in clauses
(iii) or (iv) shall be included in calculating whether the conditions of clause
(C) of the first paragraph of 
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<PAGE>

 this "Limitation on Restricted Payments" covenant have been met with respect 
to any subsequent Restricted Payments. In the event the proceeds of an 
issuance of Capital Stock of WCI are used for the redemption, repurchase or 
other acquisition of the Senior Notes or the Equipment Notes, as the case may 
be, or Indebtedness that is PARI PASSU with the Senior Notes or the Equipment 
Note Guarantee, as the case may be, then the Net Cash Proceeds of such 
issuance shall be included in clause (C) of the first paragraph of this 
"Limitation on Restricted Payments" covenant only to the extent such proceeds 
are not used for such redemption, repurchase or other acquisition of 
Indebtedness.
 
    Limitation on Dividend and Other Payment Restrictions Affecting 
Restricted Subsidiaries
 
    Under the terms of each of the Indentures, WCI will not, and will not 
permit any Restricted Subsidiary to, create or otherwise cause or suffer to 
exist or become effective any consensual encumbrance or restriction of any 
kind on the ability of any Restricted Subsidiary to (i) pay dividends or make 
any other distributions permitted by applicable law on any Capital Stock of 
such Restricted Subsidiary owned by WCI or any other Restricted Subsidiary, 
(ii) pay any Indebtedness owed to WCI or any other Restricted Subsidiary that 
owns, directly or indirectly, any Capital Stock of such Restricted 
Subsidiary, (iii) make loans or advances to WCI or any other Restricted 
Subsidiary that owns, directly or indirectly, any Capital Stock of such 
Restricted Subsidiary or (iv) transfer any of its property or assets to WCI 
or any other Restricted Subsidiary that owns, directly or indirectly, any 
Capital Stock of such Restricted Subsidiary.
 
    The foregoing provisions shall not prohibit any encumbrances or 
restrictions: (i) existing on the Closing Date in the Indentures or any other 
agreement in effect on the Closing Date, and any extensions, refinancings, 
renewals or replacements of such agreements; provided, however, that the 
encumbrances and restrictions in any such extensions, refinancings, renewals 
or replacements are no less favorable in any material respect to the Holders 
than those encumbrances or restrictions that are then in effect and that are 
being extended, refinanced, renewed or replaced; (ii) existing under or by 
reason of applicable law; (iii) existing with respect to any Person or the 
property or assets of such Person acquired by WCI or any Restricted 
Subsidiary, at the time of such acquisition and not incurred in contemplation 
thereof, which encumbrances or restrictions are not applicable to any Person 
or the property or assets of any Person other than such Person or the 
property or assets of such Person so acquired; (iv) in the case of clause 
(iv) of the first paragraph of this "Limitation on Dividend and Other Payment 
Restrictions Affecting Restricted Subsidiaries" covenant, (A) that restrict 
in a customary manner the subletting, assignment or transfer of any property 
or asset that is a lease, license, conveyance or contract or similar property 
or asset, (B) existing by virtue of any transfer of, agreement to transfer, 
option or right with respect to, or Lien on, any property or assets of WCI or 
any Restricted Subsidiary not otherwise prohibited by the Indenture or (C) 
arising or agreed to in the ordinary course of business, not relating to any 
Indebtedness, and that do not, individually or in the aggregate, detract from 
the value of property or assets of WCI or any Restricted Subsidiary in any 
manner material to WCI or any Restricted Subsidiary; or (v) with respect to a 
Restricted Subsidiary and imposed pursuant to an agreement that has been 
entered into for the sale or disposition of all or substantially all of the 
Capital Stock of, or property and assets of, such Restricted Subsidiary. 
Nothing contained in this "Limitation on Dividend and Other Payment 
Restrictions Affecting Restricted Subsidiaries" covenant shall prevent WCI or 
any Restricted Subsidiary from (i) restricting the sale or other disposition 
of property or assets of WCI or any of its Restricted Subsidiaries that 
secure Indebtedness of WCI or any of its Restricted Subsidiaries or (ii) 
creating, incurring, assuming or suffering to exist any Liens otherwise 
permitted pursuant to the covenant described under "--Covenants Relating to 
the Senior Notes and the Equipment Notes--Limitation on Liens."
 
    Limitation on the Issuance and Sale of Capital Stock of Restricted
Subsidiaries
 
    Under the terms of each of the Indentures, WCI will not sell, and will not
permit any Restricted Subsidiary, directly or indirectly, to issue or sell any
shares of Capital Stock of a Restricted Subsidiary (including options, warrants
or other rights to purchase shares of such Capital Stock) except (i) to WCI or a
Wholly Owned Restricted Subsidiary, (ii) issuances or sales to foreign nationals
of shares of Capital Stock of foreign Restricted Subsidiaries, to the extent
required by applicable law, (iii) if, immediately after giving effect to such
issuance or sale, such Restricted Subsidiary would no longer constitute a
Restricted Subsidiary or (iv) issuances or sales of Common Stock of Restricted
Subsidiaries, other than the Telecommunications Subsidiaries, if within six
months of each such issuance or sale, WCI or such Restricted Subsidiary applies
an amount not less than the Net Cash Proceeds thereof (if any) in accordance
with clause (A) or (B) of the first paragraph of the "Limitation on Asset Sales"
covenant described below.

 
                                       48
<PAGE>
 
   LIMITATION ON ISSUANCES OF GUARANTEES BY RESTRICTED SUBSIDIARIES
 
    Under the terms of each of the Indentures, WCI will not permit any 
Restricted Subsidiary, directly or indirectly, to Guarantee any Indebtedness 
of WCI ("Guaranteed Indebtedness"), unless (i) such Restricted Subsidiary 
simultaneously executes and delivers a supplemental indenture to the 
Indenture providing for a Guarantee (a "Subsidiary Guarantee") of payment of 
the Notes by such Restricted Subsidiary and (ii) such Restricted Subsidiary 
waives and will not in any manner whatsoever claim or take the benefit or 
advantage of, any rights of reimbursement, indemnity or subrogation or any 
other rights against WCI or any other Restricted Subsidiary as a result of 
any payment by such Restricted Subsidiary under its Subsidiary Guarantee; 
provided, however, that this paragraph shall not be applicable to any 
Guarantee of any Restricted Subsidiary that (x) existed at the time such 
Person became a Restricted Subsidiary and (y) was not Incurred in connection 
with, or in contemplation of, such Person becoming a Restricted Subsidiary. 
If the Guaranteed Indebtedness is (A) pari passu with the Senior Notes or the 
Equipment Note Guarantee, as the case may be, then the Guarantee of such 
Guaranteed Indebtedness shall be PARI PASSU with, or subordinated to, the 
Subsidiary Guarantee or (B) subordinated to the Senior Notes or the Equipment 
Note Guarantee, as the case may be, then the Guarantee of such Guaranteed 
Indebtedness shall be subordinated to the Subsidiary Guarantee at least to 
the extent that the Guaranteed Indebtedness is subordinated to the Senior 
Notes or the Equipment Note Guarantee, as the case may be.
 
    Notwithstanding the foregoing, any Subsidiary Guarantee by a Restricted 
Subsidiary shall provide by its terms that it shall be automatically and 
unconditionally released and discharged upon (i) any sale, exchange or 
transfer, to any Person not an Affiliate of WCI of all of WCI's and each 
Restricted Subsidiary's Capital Stock in, or all or substantially all the 
assets of, such Restricted Subsidiary (which sale, exchange or transfer is 
not prohibited by the Indenture) or (ii) the release or discharge of the 
Guarantee which resulted in the creation of such Subsidiary Guarantee, except 
a discharge or release by or as a result of payment under such Guarantee.
 
    LIMITATION ON TRANSACTIONS WITH SHAREHOLDERS AND AFFILIATES
 
    Under the terms of each of the Indentures, WCI will not, and will not 
permit any Restricted Subsidiary to, directly or indirectly, enter into, 
renew or extend any transaction (including, without limitation, the purchase, 
sale, lease or exchange of property or assets, or the rendering of any 
service) with any holder (or any Affiliate of such holder) of 5% or more of 
any class of Capital Stock of WCI or with any Affiliate of WCI or any 
Restricted Subsidiary, except upon fair and reasonable terms no less 
favorable to WCI or such Restricted Subsidiary than could be obtained, at the 
time of such transaction or, if such transaction is pursuant to a written 
agreement, at the time of the execution of the agreement providing therefor, 
in a comparable arm's-length transaction with a Person that is not such a 
holder or an Affiliate.
 
    The foregoing limitation does not limit, and shall not apply to (i) 
transactions (A) approved by a majority of the disinterested members of the 
Board of Directors or (B) for which WCI or a Restricted Subsidiary delivers 
to the Trustee a written opinion of a nationally recognized investment 
banking firm stating that the transaction is fair to WCI or such Restricted 
Subsidiary from a financial point of view; (ii) any transaction solely 
between WCI and any of its Wholly Owned Restricted Subsidiaries or solely 
between Wholly Owned Restricted Subsidiaries; (iii) the payment of reasonable 
fees to directors of WCI who are not employees of WCI; (iv) any payments or 
other transactions pursuant to any tax-sharing agreement between WCI and any 
other Person with which WCI files a consolidated tax return or with which WCI 
is part of a consolidated group for tax purposes; or (v) any Restricted 
Payments not prohibited by the covenant described under "--Limitation on 
Restricted Payments" (other than pursuant to clause (iv) of the definition of 
"Permitted Investment" or clause (vi) of the second paragraph of such 
covenant). Notwithstanding the foregoing, any transaction covered by the 
first paragraph of this "Limitation on Transactions with Shareholders and 
Affiliates" covenant and not covered by clauses (ii) through (iv) of this 
paragraph, the aggregate amount of which exceeds $250,000 in value, must be 
approved or determined to be fair in the manner provided for in clause (i)(A) 
or (B) above.
 
    LIMITATION ON ASSET SALES
 
    Under the terms of each of the Indentures, WCI will not, and will not 
permit any Restricted Subsidiary to, consummate any Asset Sale, unless (i) 
the consideration received by WCI or such Restricted Subsidiary is at least 
equal to the fair market value of the assets sold or disposed of and (ii) at 
least 85% of the consideration received consists 
                                      49 

<PAGE>

of cash or Temporary Cash Investments. In the event and to the extent that 
the Net Cash Proceeds received by WCI or its Restricted Subsidiaries from one 
or more Asset Sales occurring on or after the Closing Date in any period of 
12 consecutive months exceed 10% of Adjusted Consolidated Net Tangible Assets 
(determined as of the date closest to the commencement of such 12-month 
period for which a consolidated balance sheet of WCI and its Subsidiaries has 
been prepared), then WCI shall or shall cause the relevant Restricted 
Subsidiary to (i) within six months after the date Net Cash Proceeds so 
received exceed 10% of Adjusted Consolidated Net Tangible Assets (A) apply an 
amount equal to such excess Net Cash Proceeds to permanently repay 
unsubordinated Indebtedness of WCI, or Indebtedness of any Restricted 
Subsidiary, in each case owing to a Person other than WCI or any of its 
Restricted Subsidiaries or (B) invest an equal amount, or the amount not so 
applied pursuant to clause (A) (or enter into a definitive agreement 
committing to so invest within six months after the date of such agreement), 
in property or assets of a nature or type or that are used in a business (or 
in a company having property and assets of a nature or type, or engaged in a 
business) similar or related to the nature or type of the property and assets 
of, or the business of, WCI and its Restricted Subsidiaries existing on the 
date of such investment (as determined in good faith by the Board of 
Directors, whose determination shall be conclusive and evidenced by a Board 
Resolution) and (ii) apply (no later than the end of the six-month period 
referred to in clause (i)) such excess Net Cash Proceeds (to the extent not 
applied pursuant to clause (i)) as provided in the following paragraph of 
this "Limitation on Asset Sales" covenant. The amount of such excess Net Cash 
Proceeds required to be applied (or to be committed to be applied) during 
such six-month period as set forth in clause (i) of the preceding sentence 
and not applied as so required by the end of such period shall constitute 
"Excess Proceeds."
 
    If, as of the first day of any calendar month, the aggregate amount of 
Excess Proceeds not theretofore subject to an Offer to Purchase pursuant to 
this "Limitation on Asset Sales" covenant totals at least $10.0 million, WCI 
must commence, not later than the 15th Business Day after the first day of 
such month, and consummate an Offer to Purchase from the Holders on a pro 
rata basis an aggregate principal amount of Notes equal to the Excess 
Proceeds on such date, at a purchase price equal to 101% of, in the case of 
the Senior Notes, the Accumulated Amount of such Notes on such date of 
purchase, and, in the case of the Equipment Notes, the principal amount of 
such Notes, plus, in each case, accrued and unpaid interest (if any) on such 
amount to the date of purchase.
 
    Because of similar requirements in the indentures governing the Old 
Senior Notes and the Convertible Notes, WCI may not have Excess Proceeds from 
an Asset Sale to be able to comply with the foregoing requirements.
 
    Notwithstanding the foregoing, pursuant to the Equipment Notes Indenture, 
WinStar Equipment will not, and WCI will not permit WinStar Equipment to, 
consummate any Asset Sale of Collateral, unless (A) such Asset Sale complies 
with clause (i) and (ii) of the first paragraph of this covenant and WinStar 
Equipment applies the Net Cash Proceeds from such Asset Sale within 45 days 
following the date of receipt of such Net Cash Proceeds to acquire additional 
Designated Equipment and (B) WinStar Equipment takes such action as is 
necessary to vest in the Equipment Notes Trustee a security interest in such 
additional Designated Equipment pursuant to the covenant described under 
"--Covenants Relating to the Equipment Notes--Purchase Money Security 
Interests."
 
    LIMITATION ON LIENS
 
    Under the terms of each of the Indentures, WCI will not, and will not 
permit any Restricted Subsidiary to, create, incur, assume or suffer to exist 
any Lien on any of its assets or properties of any character, or any shares 
of Capital Stock or Indebtedness of any Restricted Subsidiary (collectively, 
"Protected Property"), without making effective provision for all of the 
Senior Notes or the Equipment Note Guarantee, as the case may be, and all 
other amounts due under the Indentures and payable by WCI to be directly 
secured equally and ratably with (or, if the obligation or liability to be 
secured by such Lien is subordinated in right of payment to the Senior Notes 
or the Equipment Note Guarantee, as the case may be, prior to) the obligation 
or liability secured by such Lien.
 
    The foregoing limitation does not apply to (i) Liens existing on the 
Closing Date; (ii) Liens granted after the Closing Date on any assets or 
Capital Stock of WCI or its Restricted Subsidiaries created in favor of the 
Holders; (iii) Liens with respect to the assets of a Restricted Subsidiary 
granted by such Restricted Subsidiary to WCI or a Wholly Owned Restricted 
Subsidiary to secure Indebtedness owing to WCI or such other Restricted 
Subsidiary; (iv) Liens securing Indebtedness which is Incurred to refinance 
secured Indebtedness which is permitted to be Incurred under clause (iii) of 
the second paragraph of the covenant described under "--Limitation on 
Indebtedness;" provided, 
 
                                       50 

<PAGE>

however, that such Liens do not extend to or cover any property or assets of 
WCI or any Restricted Subsidiary other than the property or assets securing 
the Indebtedness being refinanced; (v) Liens securing Indebtedness Incurred 
pursuant to the first sentence of the covenant described under "--Limitation 
on Indebtedness;" (vi) purchase money or other Liens upon equipment or 
inventory acquired or held by WCI or any of its Restricted Subsidiaries taken 
or obtained by (A) the seller or lessor of such equipment or inventory to 
secure all or a part of the purchase price or lease payments therefor or (B) 
the person who makes advances or incurs obligations, thereby giving value to 
WCI to enable it to purchase or acquire rights in such equipment or 
inventory, to secure the repayment of all or a part of the advances so made 
or obligations so incurred; provided, however, that such Liens do not extend 
to or cover any property or assets of WCI or any Restricted Subsidiary other 
than the equipment or inventory acquired; or (vii) Permitted Liens.
 
    LIMITATION ON SALE-LEASEBACK TRANSACTIONS
 
    Under the terms of each of the Indentures, WCI will not, and will not 
permit any Restricted Subsidiary to, enter into any sale-leaseback 
transaction involving any of its assets or properties whether now owned or 
hereafter acquired, whereby WCI or a Restricted Subsidiary sells or transfers 
such assets or properties and then or thereafter leases such assets or 
properties or any part thereof or any other assets or properties which WCI or 
such Restricted Subsidiary, as the case may be, intends to use for 
substantially the same purpose or purposes as the assets or properties sold 
or transferred.
 
    The foregoing restriction does not apply to any sale-leaseback 
transaction if (i) the lease is for a period, including renewal rights, of 
not in excess of three years; (ii) the lease secures or relates to industrial 
revenue or pollution control bonds; (iii) the transaction is solely between 
WCI and any Wholly Owned Restricted Subsidiary or solely between Wholly Owned 
Restricted Subsidiaries; (iv) the assets or properties are sold and leased 
back within 30 days of the date that the account payable with respect to the 
acquisition by WCI or any Restricted Subsidiary of such assets or properties 
is due and payable; or (v) WCI or such Restricted Subsidiary, within six 
months after the sale or transfer of any assets or properties is completed, 
applies an amount not less than the net proceeds received from such sale in 
accordance with clause (A) or (B) of the first paragraph of the covenant 
described under "--Limitation on Asset Sales."
 
COVENANTS RELATING TO THE EQUIPMENT NOTES
 
    BUSINESS ACTIVITIES
 
    Under the terms of the Equipment Notes Indenture, WinStar Equipment shall 
not, and WCI shall not permit WinStar Equipment to, (i) Incur any 
Indebtedness other than the Equipment Notes and refinancings thereof 
permitted by the covenant described under "--Covenants Relating to All the 
Notes-- Limitation of Indebtedness" or (ii) engage in any business activities 
other than (A) the activities contemplated in the covenants described under 
"--Use of Proceeds" and "--Purchase Money Security Interests," (B) leasing 
Designated Equipment and (C) activities incidental to the activities 
described in clauses (A) and (B).
 
USE OF PROCEEDS
 
    Under the terms of the Equipment Notes Indenture, WinStar Equipment will, 
and WCI will cause WinStar Equipment to, apply the gross proceeds received by 
WinStar Equipment from the sale of the Equipment Notes to acquire Designated 
Equipment, including the payment of the purchase price therefor and shipping, 
handling, storage, transportation, testing and insurance charges, design, 
integration and site preparation expenses and installation and 
service/warranty costs associated with the acquisition of any Designated 
Equipment (collectively, "Acquisition Costs"). On the Closing Date, WinStar 
Equipment will acquire Designated Equipment having an Acquisition Cost of at 
least $10.0 million. Any gross proceeds not applied on the Closing Date to 
acquire Designated Equipment pursuant to this covenant will be invested by 
WinStar Equipment in Temporary Cash Investments pending application of such 
gross proceeds to acquire Designated Equipment (or application of such gross 
proceeds pursuant to the provisions describe above under "--Mandatory 
Redemption of Equipment Notes").
 
                                       51 

<PAGE>

    PURCHASE MONEY SECURITY INTERESTS

    Under the terms of the Equipment Notes Indenture, upon the acquisition by 
WinStar Equipment of Designated Equipment, WinStar Equipment will, and WCI 
will cause WinStar Equipment to, take such action as is required to vest in 
the Equipment Notes Trustee a security interest in such Designated Equipment, 
for the benefit of the Holders of Equipment Notes, and thereupon all 
provisions of the Indenture relating to Collateral shall be deemed to relate 
to and include such Designated Equipment. On the Closing Date and from time 
to time if requested by the Equipment Notes Trustee, WinStar Equipment will, 
and WCI will cause WinStar Equipment to, execute such security instruments 
and financing statements as may be reasonably necessary to vest in the 
Trustee such security interest. In addition, with respect to any 
telecommunications switch that constitutes Designated Equipment acquired 
pursuant to the covenant described under "--Use of Proceeds," WinStar 
Equipment will post a notice on, or in the location housing, such 
telecommunications switch, identifying WinStar Equipment as the owner of such 
telecommunications switch and stating that such telecommunications switch is 
subject to the security interest under the Equipment Notes Indenture.
 
    IMPAIRMENT OF SECURITY INTEREST

    Under the terms of the Equipment Notes Indenture, WinStar Equipment will, 
and WCI will cause WinStar Equipment to, on or prior to the Closing Date, 
file UCC-1s in each state in the United States covering all Designated 
Equipment acquired by WinStar Equipment pursuant to the covenant described 
above under "--Use of Proceeds," and to file such UCC-3 continuation 
statements from time to time as may be necessary to continue the 
effectiveness of such filings, and WinStar Equipment will not, and WCI will 
not and will not permit any of its Subsidiaries to, grant to any Person 
(other than the Equipment Notes Trustee on behalf of Holders of the Equipment 
Notes) any security interest in the Collateral.

    OWNERSHIP OF WINSTAR EQUIPMENT

    Under the terms of the Equipment Notes Indenture, WCI will at all times 
own all the Capital Stock of WinStar Equipment.

SEC REPORTS AND REPORTS TO HOLDERS

    Whether or not WCI is required to file reports with the SEC, if any Notes 
are outstanding, WCI shall file with the SEC all such reports and other 
information as it would be required to file with the SEC by Sections 13(a) or 
15(d) under the Exchange Act. See "Available Information." WCI shall supply 
the Trustee and each Holder of Notes, as the case may be, or shall supply to 
the relevant Trustee for forwarding to each such Holder, without cost to such 
Holder, copies of such reports or other information.

CONSOLIDATION, MERGER AND SALE OF ASSETS

    Under the terms of the Indentures, WCI shall not consolidate with, merge 
with or into, or sell, convey, transfer, lease or otherwise dispose of all or 
substantially all of its property and assets (as an entirety or substantially 
an entirety in one transaction or a series of related transactions) to, any 
Person (other than a consolidation or merger with or into a Wholly Owned 
Restricted Subsidiary with a positive net worth; provided, however, that, in 
connection with any such merger or consolidation, no consideration (other 
than Common Stock in the surviving Person or WCI) shall be issued or 
distributed to the stockholders of WCI) or permit any Person to merge with or 
into WCI unless: (i) WCI shall be the continuing Person, or the Person (if 
other than WCI) formed by such consolidation or into which WCI is merged or 
that acquired or leased such property and assets of WCI shall be a 
corporation organized and validly existing under the laws of the United 
States of America or any jurisdiction thereof and shall expressly assume, by 
a supplemental indenture, executed and delivered to the Trustee, all of the 
obligations of WCI on all of the Senior Notes or the Equipment Note 
Guarantee, as the case may be, and under the relevant Indenture; (ii) 
immediately after giving effect to such transaction, no Default or Event of 
Default shall have occurred and be continuing; (iii) immediately after giving 
effect to such transaction on a pro forma basis, WCI or any Person becoming 
the successor obligor of the Senior Notes or the Equipment Note Guarantee, as 
the case may be, shall have a Consolidated Net Worth equal to or greater than 
the Consolidated Net Worth of WCI immediately prior to such transaction; (iv) 
immediately after giving effect to such transaction on a pro forma basis WCI, 
or any Person becoming the successor obligor of the Senior Notes or

                                       52
<PAGE>

the Equipment Note Guarantee, as the case may be, could Incur at least $1.00 
of Indebtedness under the first paragraph of the covenant described under 
"--Covenants--Covenants Relating to All the Notes--Limitation on 
Indebtedness;" and (v) WCI delivers to the relevant Trustee an Officers' 
Certificate (attaching the arithmetical computations to demonstrate 
compliance with clauses (iii) and, if applicable, (iv)) and Opinion of 
Counsel, in each case stating that such consolidation, merger or transfer and 
such supplemental indenture complies with this provision and that all 
conditions precedent provided for herein relating to such transaction have 
been complied with; provided, however, that clauses (iii) and (iv) above do 
not apply if, in the good faith determination of the Board of Directors of 
WCI, whose determination shall be evidenced by a Board Resolution, the 
principal purpose of such transaction is to change the state of incorporation 
of WCI; provided further, however, that any such transaction shall not have 
as one of its purposes the evasion of the foregoing limitations.
 
    Under the terms of the Equipment Notes Indenture, WinStar Equipment shall 
not consolidate with, merge with or into, or sell, convey, transfer, lease 
(other than in the ordinary course of business) or otherwise dispose of all 
or substantially all of its property and assets to, any Person or permit any 
Person to merge with and into WinStar Equipment unless: (i) WinStar Equipment 
shall be the continuing Person, or the Person (if other than WinStar 
Equipment) formed by such consolidation or into which WinStar Equipment is 
merged or that acquired or leased such property and assets of WinStar 
Equipment shall be a corporation organized and validly existing under the 
laws of the United States of America or any jurisdiction thereof and shall 
expressly assume, by a supplemental indenture, executed and delivered to the 
Equipment Notes Trustee, all of the obligations of WinStar Equipment on all 
of the Equipment Notes and under the Equipment Notes Indenture; (ii) 
immediately after giving effect to such transaction, no Default or Event of 
Default shall have occurred and be continuing; and (iii) WinStar Equipment 
delivers to the Equipment Notes Trustee an Officers' Certificate and Opinion 
of Counsel, in each case stating that such consolidation, merger or transfer 
and such supplemental indenture complies with this provision and that all 
conditions precedent provided for herein relating to such transaction have 
been complied with.
 
EVENTS OF DEFAULT
 
    The following events will be defined as "Events of Default" in each of 
the Indentures: (i) default in the payment of principal of (or premium, if 
any, on) any Senior Note or Equipment Note, as the case may be, when the same 
becomes due and payable at maturity, upon acceleration, redemption or 
otherwise; (ii) default in the payment of interest on any Senior Note or 
Equipment Note, as the case may be, when the same becomes due and payable, 
and such default continues for a period of 30 days; (iii) WCI or WinStar 
Equipment defaults in the performance of or breaches any other covenant or 
agreement of WCI or WinStar Equipment in the Senior Notes Indenture or the 
Equipment Notes Indenture, as the case may be, or under the Senior Notes or 
the Equipment Notes, as the case may be, and such default or breach continues 
for a period of 30 consecutive days after written notice by the relevant 
Trustee or the Holders of 25% or more in aggregate principal amount of Senior 
Notes or Equipment Notes, as the case may be; (iv) there occurs with respect 
to any issue or issues of Indebtedness of WCI or any Significant Subsidiary 
having an outstanding principal amount of $25.0 million or more in the 
aggregate for all such issues of all such Persons, whether such Indebtedness 
now exists or shall hereafter be created, (a) an event of default that has 
caused the holder thereof to declare such Indebtedness to be due and payable 
prior to its Stated Maturity and such Indebtedness has not been discharged in 
full or such acceleration has not been rescinded or annulled within 30 days 
of such acceleration and/or (b) the failure to make a principal payment at 
the final (but not any interim) fixed maturity and such defaulted payment 
shall not have been made, waived or extended within 30 days of such payment 
default; (v) any final judgment or order (not covered by insurance) for the 
payment of money in excess of $25.0 million in the aggregate for all such 
final judgments or orders against all such Persons (treating any deductibles, 
self-insurance or retention as not so covered) shall be rendered against WCI 
or any Significant Subsidiary and shall not be paid or discharged, and there 
shall be any period of 60 consecutive days following entry of the final 
judgment or order that causes the aggregate amount for all such final 
judgments or orders outstanding and not paid or discharged against all such 
Persons to exceed $25.0 million during which a stay of enforcement of such 
final judgment or order, by reason of a pending appeal or otherwise, shall 
not be in effect; (vi) a court having jurisdiction in the premises enters a 
decree or order for (a) relief in respect of WCI or any Significant 
Subsidiary in an involuntary case under any applicable bankruptcy, insolvency 
or other similar law now or hereafter in effect, (b) appointment of a 
receiver, liquidator, assignee, custodian, trustee, sequestrator or similar 
official of WCI or any Significant Subsidiary or for all or substantially all 
of the property and assets of WCI, WinStar Equipment or any Significant 
Subsidiary or (c) the winding up or liquidation of the affairs of WCI or any 
Significant Subsidiary and, in each case, such decree or order shall remain 
unstayed and in effect for
 
                                       53 

<PAGE> 

a period of 60 consecutive days; or (vii) WCI or any Significant Subsidiary 
(a) commences a voluntary case under any applicable bankruptcy, insolvency or 
other similar law now or hereafter in effect, or consents to the entry of an 
order for relief in an involuntary case under any such law, (b) consents to 
the appointment of or taking possession by a receiver, liquidator, assignee, 
custodian, trustee, sequestrator or similar official of WCI or any 
Significant Subsidiary or for all or substantially all of the property and 
assets of WCI or any Significant Subsidiary or (c) effects any general 
assignment for the benefit of creditors. In addition to the foregoing, it 
shall be an Event of Default under the Equipment Notes Indenture if (i) any 
of the provisions of the Equipment Notes Indenture relating to the Security 
Documents or the Security Documents shall cease to be in full force and 
effect or shall cease to give the secured parties the liens, rights, powers 
and privileges purported to be created thereby or (ii) the Equipment Note 
Guarantee ceases to be in full force and effect (other than in accordance 
with its terms) or WCI denies or disaffirms its obligations under the 
Equipment Note Guarantee.
 
    If an Event of Default (other than an Event of Default specified in 
clause (vi) or (vii) above that occurs with respect to WCI or WinStar 
Equipment) occurs and is continuing under the Indenture, the Trustee or the 
Holders of at least 25% in aggregate principal amount of the Senior Notes or 
Equipment Notes, as the case may be, then outstanding, by written notice to 
WCI (and to the relevant Trustee if such notice is given by the Holders), 
may, and the relevant Trustee at the request of such Holders shall, declare 
the principal of, premium, if any, and accrued interest, if any, on the 
Senior Notes or the Equipment Notes, as the case may be, to be immediately 
due and payable. Upon a declaration of acceleration, such principal, premium, 
if any, and accrued interest, if any, shall be immediately due and payable. 
In the event of a declaration of acceleration because an Event of Default set 
forth in clause (iv) above has occurred and is continuing, such declaration 
of acceleration shall be automatically rescinded and annulled if the event of 
default triggering such Event of Default pursuant to clause (iv) shall be 
remedied or cured by WCI or the relevant Significant Subsidiary or waived by 
the holders of the relevant Indebtedness within 60 days after the declaration 
of acceleration with respect thereto. If an Event of Default specified in 
clause (vi) or (vii) above occurs with respect to WCI or WinStar Equipment, 
the principal of, premium, if any, and accrued interest, if any, on the Notes 
then outstanding shall ipso facto become and be immediately due and payable 
without any declaration or other act on the part of either Trustee or any 
Holder. The Holders of at least a majority in principal amount of the 
outstanding Senior Notes or Equipment Notes, as the case may be, by written 
notice to WCI and to the relevant Trustee, may waive all past defaults and 
rescind and annul a declaration of acceleration and its consequences if (A) 
all existing Events of Default, other than the nonpayment of the principal 
of, premium, if any, and interest on the Senior Notes or the Equipment Notes, 
as the case may be, that have become due solely by such declaration of 
acceleration, have been cured or waived and (B) the rescission would not 
conflict with any judgment or decree of a court of competent jurisdiction. 
For information as to the waiver of defaults, see "--Modification and Waiver."

    The Holders of at least a majority in aggregate principal amount of the 
outstanding Senior Notes or Equipment Notes, as the case may be, may direct 
the time, method and place of conducting any proceeding for any remedy 
available to the relevant Trustee or exercising any trust or power conferred 
on the relevant Trustee. However, such Trustee may refuse to follow any 
direction that conflicts with law or the relevant Indenture, that may involve 
such Trustee in personal liability, or that such Trustee determines in good 
faith may be unduly prejudicial to the rights of Holders of Senior Notes or 
Equipment Notes, as the case may be, not joining in the giving of such 
direction and may take any other action it deems proper that is not 
inconsistent with any such direction received from Holders of Senior Notes or 
Equipment Notes, as the case may be. A Holder may not pursue any remedy with 
respect to the relevant Indenture or the Senior Notes or the Equipment Notes, 
as the case may be, unless: (i) the Holder gives the relevant Trustee written 
notice of a continuing Event of Default; (ii) the Holders of at least 25% in 
aggregate principal amount of outstanding Senior Notes or Equipment Notes, as 
the case may be, make a written request to the relevant Trustee to pursue the 
remedy; (iii) such Holder or Holders offer the relevant Trustee indemnity 
satisfactory to such Trustee against any costs, liability or expense; (iv) 
such Trustee does not comply with the request within 60 days after receipt of 
the request and the offer of indemnity; and (v) during such 60-day period, 
the Holders of a majority in aggregate principal amount of the outstanding 
Senior Notes or Equipment Notes, as the case may be, do not give the relevant 
Trustee a direction that is inconsistent with the request. However, such 
limitations do not apply to the right of any Holder of a Senior Note or 
Equipment Note, as the case may be, to receive payment of the principal of, 
premium, if any, or interest on, such Note or to bring suit for the 
enforcement of any such payment, on or after the due date expressed in the 
Senior Notes or the Equipment Notes, as the case may be, which right shall 
not be impaired or affected without the consent of the Holder.

                                       54
 
<PAGE>

    The Indentures require certain officers of WCI to certify, on or before a 
date not more than 90 days after the end of each fiscal year, that a review 
has been conducted of the activities of WCI and its Restricted Subsidiaries' 
performance under the Indentures and that, to the best knowledge of such 
officer, WCI has fulfilled all obligations thereunder, or, if there has been 
a default in the fulfillment of any such obligation, specifying each such 
default and the nature and status thereof. WCI is also obligated to notify 
the relevant Trustee of any default or defaults in the performance of any 
covenants or agreements under the Senior Notes Indenture or the Equipment 
Notes Indenture, as the case may be.
 
DEFEASANCE
 
    DEFEASANCE AND DISCHARGE. The Indentures provide that WCI and WinStar 
Equipment will be deemed to have paid and will be discharged from any and all 
obligations in respect of the Senior Notes or the Equipment Notes, as the 
case may be, on the 123rd day after the deposit referred to below, and the 
provisions of such Indenture will no longer be in effect with respect to the 
Senior Notes or the Equipment Notes, as the case may be, (except for, among 
other matters, certain obligations to register the transfer or exchange of 
the Senior Notes or the Equipment Notes, as the case may be, to replace 
stolen, lost or mutilated Senior Notes or Equipment Notes, as the case may 
be, to maintain paying agencies, to hold monies for payment in trust), 
including in the case of the Equipment Notes Indenture, the provisions of 
such Indenture pursuant to which the Equipment Notes are secured by the 
Collateral and guaranteed by WCI, if, among other things, (A) WCI or WinStar 
Equipment, as the case may be, has deposited with the relevant Trustee, in 
trust, money and/or U.S. Government Obligations that through the payment of 
interest and principal in respect thereof in accordance with their terms will 
provide money in an amount sufficient to pay the principal of, premium, if 
any, and accrued interest on the Senior Notes or the Equipment Notes, as the 
case may be, on the Stated Maturity of such payments or upon earlier optional 
redemption, in each case in accordance with the terms of the relevant 
Indenture and the Senior Notes or the Equipment Notes, as the case may be, 
(B) WCI or WinStar Equipment, as the case may be, has delivered to the 
relevant Trustee (i) either (x) an Opinion of Counsel to the effect that 
Holders will not recognize income, gain or loss for federal income tax 
purposes as a result of WCI's or WinStar Equipment's exercise of its option 
under this "Defeasance" provision and will be subject to federal income tax 
on the same amount and in the same manner and at the same times as would have 
been the case if such deposit, defeasance and discharge had not occurred, 
which Opinion of Counsel must be based upon (and accompanied by a copy of) a 
ruling of the Internal Revenue Service to the same effect unless there has 
been a change in applicable federal income tax law after the Closing Date 
such that a ruling is no longer required or (y) a ruling directed to the 
Trustee received from the Internal Revenue Service to the same effect as the 
aforementioned Opinion of Counsel and (ii) an Opinion of Counsel to the 
effect that the creation of the defeasance trust does not violate the 
Investment Company Act of 1940 and after the passage of 123 days following 
the deposit, the trust fund will not be subject to the effect of Section 547 
of the Bankruptcy Code or Section 15 of the New York Debtor and Creditor Law, 
(C) immediately after giving effect to such deposit on a pro forma basis, no 
Event of Default, or event that after the giving of notice or lapse of time 
or both would become an Event of Default, shall have occurred and be 
continuing on the date of such deposit or during the period ending on the 
123rd day after the date of such deposit, and such deposit shall not result 
in a breach or violation of, or constitute a default under, any other 
agreement or instrument to which WCI or any of its Subsidiaries or WinStar 
Equipment, as the case may be, is a party or by which WCI or any of its 
Subsidiaries or WinStar Equipment, as the case may be, is bound, and (D) if 
at such time the Senior Notes or the Equipment Notes, as the case may be, are 
listed on a national securities exchange, WCI or WinStar Equipment, as the 
case may be, has delivered to the relevant Trustee an Opinion of Counsel to 
the effect that the applicable Notes will not be delisted as a result of such 
deposit, defeasance and discharge.
 
    Defeasance of Certain Covenants and Certain Events of Default. The 
Indentures further provide that their provisions will no longer be in effect 
with respect to clauses (iii) and (iv) under "Consolidation, Merger and Sale 
of Assets" and all the covenants described herein under "Covenants," clause 
(c) under "--Events of Default" with respect to such covenants and clauses 
(iii) and (iv) under "Consolidation, Merger and Sale of Assets," and clauses 
(d) and (e) and, if applicable, (i) and (ii) under "--Events of Default" 
shall be deemed not to be Events of Default, and, with respect to the 
Equipment Notes, the Collateral will be released and the Equipment Note 
Guarantee will be deemed terminated, upon, among other things, the deposit 
with the relevant Trustee, in trust, of money and/or U.S. Government 
Obligations that through the payment of interest and principal in respect 
thereof in accordance with their terms will provide money in an amount 
sufficient to pay the principal of, premium, if any, and accrued interest on 
the Senior Notes or the Equipment Notes, as the case may be, on the Stated 
Maturity of such payments or upon earlier optional 

                                      55   


<PAGE>

redemption, in each case in accordance with the terms of the relevant 
Indenture and the Senior Notes or the Equipment Notes, as the case may be, 
the satisfaction of the provisions described in clauses (B)(ii), (C) and (D) 
of the preceding paragraph and the delivery by WCI or WinStar Equipment, as 
the case may be, to the relevant Trustee of an Opinion of Counsel to the 
effect that, among other things, the Holders will not recognize income, gain 
or loss for federal income tax purposes as a result of such deposit and 
defeasance of certain covenants and Events of Default and will be subject to 
federal income tax on the same amount and in the same manner and at the same 
times as would have been the case if such deposit and defeasance had not 
occurred.
 
    DEFEASANCE AND CERTAIN OTHER EVENTS OF DEFAULT.  In the event WCI or 
WinStar Equipment, as the case may be, exercises its option to omit 
compliance with certain covenants and provisions of an Indenture with respect 
to the Senior Notes or the Equipment Notes, as the case may be, as described 
in the immediately preceding paragraph and the Senior Notes or the Equipment 
Notes, as the case may be, are declared due and payable because of the 
occurrence of an Event of Default that remains applicable, the amount of 
money and/or U.S. Government Obligations on deposit with the relevant Trustee 
will be sufficient to pay amounts due on the Senior Notes or the Equipment 
Notes, as the case may be, at the time of their Stated Maturity but may not 
be sufficient to pay amounts due on the Senior Notes or the Equipment Notes, 
as the case may be, at the time of the acceleration resulting from such Event 
of Default. However, WCI or WinStar Equipment, as applicable, will remain 
liable for such payments.
 
                                       56
<PAGE>

MODIFICATION AND WAIVER
 
    Modifications and amendments of the 1997 Indentures may be made by WCI or 
WinStar Equipment, as the case may be, and the relevant Trustee with the 
consent of the Holders of not less than a majority in aggregate principal 
amount of the outstanding Senior Notes or Equipment Notes, as the case may 
be; provided, however, that no such modification or amendment may, without 
the consent of each Holder affected thereby, (i) change the Stated Maturity 
of the principal of, or any installment of interest on, any Note, (ii) reduce 
the principal amount of, or premium, if any, or interest on, any Note, (iii) 
change the place or currency of payment of principal of, or premium, if any, 
or interest on, any Note, (iv) impair the right to institute suit for the 
enforcement of any payment on or after the Stated Maturity (or, in the case 
of a redemption, on or after the Redemption Date) of any Note, (v) reduce the 
above-stated percentage of outstanding Senior Notes or Equipment Notes, as 
the case may be, the consent of whose Holders is necessary to modify or amend 
the Indenture, (vi) waive a default in the payment of principal of, premium, 
if any, or interest on the Notes, (vii) reduce the percentage or aggregate 
principal amount of outstanding Senior Notes or Equipment Notes, as the case 
may be, the consent of whose Holders is necessary for waiver of compliance 
with certain provisions of the Indenture or for waiver of certain defaults or 
(viii) in the case of the Equipment Notes, make any change in the Equipment 
Note Guarantee or in the provisions relating to Collateral that would 
adversely affect the Holders of the Equipment Notes.
 
    Without the consent of any Holder of the Senior Notes or the Equipment 
Notes, as the case may be, WCI or WinStar Equipment, as the case may be, and 
the relevant Trustee may modify or amend the relevant Indenture to cure any 
ambiguity, defect or inconsistency, to provide for the assumption by a 
successor company of WCI's or WinStar Equipment's, as the case may be, 
obligations under the relevant Indenture, to comply with the requirements of 
the Trust Indenture Act, to appoint a successor Trustee or to make any change 
that, in the opinion of the Board of Directors of WCI or WinStar Equipment, 
as the case may be, evidenced by a Board Resolution, does not materially and 
adversely affect the rights of any Holder.
 
    No Personal Liability of Incorporators, Stockholders, Officers, Directors 
or Employees
 
    The Indentures provide that no recourse for the payment of the principal 
of, premium, if any, or interest on any of the Notes or for any claim based 
thereon or otherwise in respect thereof, and no recourse under or upon any 
obligation, covenant or agreement of WCI or WinStar Equipment, as the case 
may be, in such Indenture, or in any of the Notes or because of the creation 
of any Indebtedness represented thereby, shall be had against any 
incorporator, stockholder, officer, director, employee or controlling person 
of WCI, WinStar Equipment or of any successor Person thereof in such 
capacity; provided, however, that the foregoing shall not affect WCI's 
obligations with respect to the Equipment Note Guarantee. Each Holder, by 
accepting the Notes, waives and releases all such liability.
 
CONCERNING THE TRUSTEE
 
    The Indentures provide that, except during the continuance of a Default, 
the Trustee will not be liable, except for the performance of such duties as 
are specifically set forth in such Indenture. If an Event of Default has 
occurred and is continuing, the Trustee will use the same degree of care and 
skill in its exercise as a prudent person would exercise under the 
circumstances in the conduct of such person's own affairs.
 
    The Indentures and provisions of the Trust Indenture Act incorporated by 
reference therein contain limitations on the rights of the Trustees, should 
they become creditors of WCI or WinStar Equipment, as the case may be, to 
obtain payment of claims in certain cases or to realize on certain property 
received by it in respect of any such claims, as security or otherwise. The 
Trustees are permitted to engage in other transactions; provided, however, 
that if any Trustee acquires any conflicting interest, it must eliminate such 
conflict or resign.
 
CERTAIN DEFINITIONS
 
    Set forth below is a summary of certain of the defined terms used in the 
covenants and other provisions of the Indentures. Reference is made to the 
relevant Indenture for the full definition of all terms as well as any other 
capitalized term used herein for which no definition is provided.

                                      57 

<PAGE> 
    "Accumulated Amount" means, as of any date (the "Specified Date"), the 
amount provided below for each $1,000 principal amount of Senior Notes.
 
    (i) if the Specified Date occurs on one of the following dates (each, a   
        "SemiAnnual Interest Accrual Date"), the Accumulated Amount of a       
        Senior Note will equal the amount set forth below for such Senior Note
        for such SemiAnnual Interest Accrual Date:
 
<TABLE>
<CAPTION>
SEMIANNUAL INTEREST ACCRUAL DATE                                                               ACCUMULATED AMOUNT
- ---------------------------------------------------------------------------------------------  -------------------
<S>                                                                                            <C>
April 15, 1997...............................................................................      $  1,010.88
October 15, 1997.............................................................................         1,084.16
April 15, 1998...............................................................................         1,162.77
October 15, 1998.............................................................................         1,247.07
April 15, 1999...............................................................................         1,337.48
October 15, 1999.............................................................................         1,434.45
April 15, 2000...............................................................................         1,538.44
October 15, 2000.............................................................................         1,649.98
</TABLE>
 
    (ii)  if the Specified Date occurs before the first SemiAnnual Interest
          Accrual Date, the Accumulated Amount will equal the sum of (A) $1,000
          and (B) an amount equal to the product of (1) the Accumulated Amount 
          for the first SemiAnnual Interest Accrual Date less $1,000 multiplied
          by (2) a fraction, the numerator of which is the number of days 
          elapsed from the Closing Date to the Specified Date, using a
          360-day year of twelve 30-day months, and the denominator of which is
          the number of days from the Closing Date to the first SemiAnnual 
          Interest Accrual Date, using a 360-day year of twelve 30-day months;
 
    (iii) if the Specified Date occurs between two SemiAnnual Interest Accrual
          Dates, the Accumulated Amount will equal the sum of (A) the 
          Accumulated Amount for the SemiAnnual Interest Accrual Date 
          immediately preceding such Specified Date and (B) an amount equal to 
          the product of (1) the Accumulated Amount for the immediately 
          following SemiAnnual Interest Accrual Date less the Accumulated
          Amount for the immediately preceding SemiAnnual Interest Accrual Date
          multiplied by (2) a fraction, the numerator of which is the number of 
          days elapsed from the immediately preceding SemiAnnual Interest 
          Accrual Date to the Specified Date, using a 360-day year of twelve 
          30-day months, and the denominator of which is 180; or
 
    (iv)  if the Specified Date occurs after the last SemiAnnual Interest 
          Accrual Date, the Accumulated Amount of a Senior Note will equal 
          $1,649.98.
 
    "Adjusted Consolidated Net Income" means, for any period, the aggregate 
net income (or loss) of WCI and its Restricted Subsidiaries for such period 
determined in conformity with GAAP; provided, however, that the following 
items shall be excluded in computing Adjusted Consolidated Net Income 
(without duplication): (i) the net income of any Person (other than net 
income attributable to a Restricted Subsidiary) in which any Person (other 
than WCI or any of its Restricted Subsidiaries) has a joint interest and the 
net income of any Unrestricted Subsidiary, except to the extent of the amount 
of dividends or other distributions actually paid to WCI or any of its 
Restricted Subsidiaries by such other Person, including, without limitation, 
an Unrestricted Subsidiary during such period; (ii) solely for the purposes 
of calculating the amount of Restricted Payments that may be made pursuant to 
clause (C) of the first paragraph of the covenant described under 
"--Covenants--Covenants Relating to All the Notes-- Limitation on Restricted 
Payments" (and in such case, except to the extent includable pursuant to 
clause (i) above), the net income (or loss) of any Person accrued prior to 
the date it becomes a Restricted Subsidiary or is merged into or consolidated 
with WCI or any of its Restricted Subsidiaries or all or substantially all of 
the property and assets of such Person are acquired by WCI or any of its 
Restricted Subsidiaries; (iii) the net income of any Restricted Subsidiary to 
the extent that the declaration or payment of dividends or similar 
distributions by such Restricted Subsidiary of such net income is not at the 
time permitted by the operation of the terms of its charter or any agreement, 
instrument, judgment, decree, order, statute, rule or governmental regulation 
applicable to such Restricted Subsidiary; (iv) any gains or losses (on an 
after-tax basis) attributable to Asset Sales; (v) except for purposes of 
calculating the amount of Restricted Payments 

                                       58

<PAGE>

that may be made pursuant to clause (C) of the first paragraph of the 
covenant described under "--Covenants--Covenants Relating to All the 
Notes--Limitation on Restricted Payments," any amount paid as, or accrued 
for, cash dividends on Preferred Stock of WCI or any Restricted Subsidiary 
owned by Persons other than WCI and any of its Restricted Subsidiaries; and 
(vi) all extraordinary gains and extraordinary losses.
 
    "Adjusted Consolidated Net Tangible Assets" means the total amount of 
assets of WCI and its Restricted Subsidiaries (less applicable depreciation, 
amortization and other valuation reserves), except to the extent resulting 
from write-ups of capital assets (excluding write-ups in connection with 
accounting for acquisitions in conformity with GAAP), after deducting 
therefrom (i) all current liabilities of WCI and its Restricted Subsidiaries 
(excluding intercompany items) and (ii) all goodwill, trade names, 
trademarks, patents, unamortized debt discount and expense and other like 
intangibles (other than licenses issued by the FCC), all as set forth on the 
quarterly or annual consolidated balance sheet of WCI and its Restricted 
Subsidiaries, prepared in conformity with GAAP and most recently filed with 
the Commission pursuant to "--SEC Reports and Reports to Holders;" provided, 
however, that the value of any licenses issued by the FCC shall, in the event 
of an auction for similar licenses, be equal to the fair market value 
ascribed thereto in good faith by the Board of Directors and evidenced by a 
Board Resolution. As used in the Indentures, references to financial 
statements of WCI and its Restricted Subsidiaries shall be adjusted to 
exclude Unrestricted Subsidiaries if the context requires.
 
    "Affiliate" means, as applied to any Person, any other Person directly or 
indirectly controlling, controlled by, or under direct or indirect common 
control with, such Person. For purposes of this definition, "control" 
(including, with correlative meanings, the terms "controlling," "controlled 
by" and "under common control with"), as applied to any Person, means the 
possession, directly or indirectly, of the power to direct or cause the 
direction of the management and policies of such Person, whether through the 
ownership of voting securities, by contract or otherwise.
 
    "Asset Acquisition" means (i) an investment by WCI or any of its 
Restricted Subsidiaries in any other Person pursuant to which such Person 
shall become a Restricted Subsidiary of WCI or shall be merged into or 
consolidated with WCI or any of its Restricted Subsidiaries or (ii) an 
acquisition by WCI or any of its Restricted Subsidiaries of the property and 
assets of any Person other than WCI or any of its Restricted Subsidiaries 
that constitute substantially all of a division or line of business of such 
Person.
 
    "Asset Sale" means any sale, transfer or other disposition (including by 
way of merger, consolidation or sale-leaseback transactions) in one 
transaction or a series of related transactions by WCI or any of its 
Restricted Subsidiaries to any Person other than WCI or any of its Restricted 
Subsidiaries of (i) all or any of the Capital Stock of any Restricted 
Subsidiary, (ii) all or substantially all of the property and assets of an 
operating unit or business of WCI or any of its Restricted Subsidiaries or 
(iii) any other property or assets of WCI or any of its Restricted 
Subsidiaries outside the ordinary course of business of WCI or such 
Restricted Subsidiary and, in each case, that is not governed by the 
provisions of the relevant Indenture applicable to mergers, consolidations 
and sales of assets of WCI; provided, however, that the following shall not 
be included within the meaning of "Asset Sale": (A) sales or other 
dispositions of inventory, receivables and other current assets; (B) sales or 
other dispositions of equipment that has become worn out, obsolete or damaged 
or otherwise unsuitable for use in connection with the business of WCI or its 
Restricted Subsidiaries; (C) a substantially simultaneous exchange of, or a 
sale or disposition (other than 85% or more for cash or cash equivalents) by 
WCI or any of its Restricted Subsidiaries of, licenses issued by the FCC or 
applications or bids therefor; provided, however, that the consideration 
received by WCI or any such Restricted Subsidiary in connection with such 
exchange, sale or disposition shall be equal to the fair market value of 
licenses so exchanged, sold or disposed of, as determined by the Board of 
Directors; and (D) except for purposes of the definition of "Indebtedness to 
EBITDA Ratio," any sale or other disposition of securities of an Unrestricted 
Subsidiary. The Equipment Notes Indenture also provides that, notwithstanding 
anything to the contrary in this definition, any sale, transfer or other 
disposition (other than a lease in the ordinary course of business but 
including the receipt of insurance proceeds in respect of Collateral) of any 
Collateral shall be deemed to be an Asset Sale of such Collateral.
 
    "Average Life" means, at any date of determination with respect to any 
debt security, the quotient obtained by dividing (i) the sum of the products 
of (a) the number of years from such date of determination to the dates of 
each successive scheduled principal payment of such debt security and (b) the 
amount of such principal payment by (ii) the sum of all such principal 
payments.

                                      59

<PAGE>
 
    "Business Day" means any day except a Saturday, Sunday or other day on 
which commercial banks in The City of New York, or in the city of the 
Corporate Trust Office of the Trustee, are authorized by law to close.
 
    "Capital Stock" means, with respect to any Person, any and all shares, 
interests, participations or other equivalents (however designated, whether 
voting or non-voting) in equity of such Person, whether now outstanding or 
issued after the date of the Indenture, including, without limitation, all 
Common Stock and Preferred Stock.
 
    "Capitalized Lease" means, as applied to any Person, any lease of any 
property (whether real, personal or mixed) of which the discounted present 
value of the rental obligations of such Person as lessee, in conformity with 
GAAP, is required to be capitalized on the balance sheet of such Person; and 
"Capitalized Lease Obligations" means the discounted present value of the 
rental obligations under such lease.
 
    "Change of Control" means such time as (i) a "person" or "group" (within 
the meaning of Sections 13(d) and 14(d)(2) of the Securities Exchange Act of 
1934, as amended ("Exchange Act")), other than the Permitted Investor, 
becomes the ultimate "beneficial owner" (as defined in Rule 13d-3 under the 
Exchange Act) of Voting Stock representing more than 50% of the total voting 
power of the Voting Stock of WCI on a fully diluted basis or (ii) individuals 
who on the Closing Date constituted the Board of Directors (together with any 
new directors whose election by the Board of Directors or whose nomination 
for election by WCI's stockholders was approved by a vote of at least 
two-thirds of the members of the Board of Directors then in office who either 
were members of the Board of Directors on the Closing Date or whose election 
or nomination for election was previously so approved) cease for any reason 
to constitute a majority of the members of the Board of Directors then in 
office.
 
    "Closing Date" means the date on which the Senior Notes or the Equipment 
Notes, as the case may be, are originally issued under the applicable 
Indenture.
 
    "Consolidated EBITDA" means, for any period, the sum of the amounts for 
such period of (i) Adjusted Consolidated Net Income, (ii) Consolidated 
Interest Expense, to the extent such amount was deducted in calculating 
Adjusted Consolidated Net Income, (iii) income taxes, to the extent such 
amount was deducted in calculating Adjusted Consolidated Net Income (other 
than income taxes (either positive or negative) attributable to extraordinary 
and nonrecurring gains or losses or sales of assets), (iv) depreciation 
expense, to the extent such amount was deducted in calculating Adjusted 
Consolidated Net Income, (v) amortization expense, to the extent such amount 
was deducted in calculating Adjusted Consolidated Net Income and (vi) all 
other noncash items reducing Adjusted Consolidated Net Income (other than 
items that will require cash payments and for which an accrual or reserve is, 
or is required by GAAP to be, made), less all noncash items increasing 
Adjusted Consolidated Net Income, all as determined on a consolidated basis 
for WCI and its Restricted Subsidiaries in conformity with GAAP; provided, 
however, that, if any Restricted Subsidiary is not a Wholly Owned Restricted 
Subsidiary, Consolidated EBITDA shall be reduced (to the extent not otherwise 
reduced in accordance with GAAP) by an amount equal to (A) the amount of the 
Adjusted Consolidated Net Income attributable to such Restricted Subsidiary 
multiplied by (B) the quotient of (1) the number of shares of outstanding 
Common Stock of such Restricted Subsidiary not owned on the last day of such 
period by WCI or any of its Restricted Subsidiaries divided by (2) the total 
number of shares of outstanding Common Stock of such Restricted Subsidiary on 
the last day of such period.
 
    "Consolidated Interest Expense" means, for any period, the aggregate 
amount of interest in respect of Indebtedness (including amortization of 
original issue discount on any Indebtedness and the interest portion of any 
deferred payment obligation, calculated in accordance with the effective 
interest method of accounting; all commissions, discounts and other fees and 
charges owed with respect to letters of credit and bankers' acceptance 
financing; the net costs associated with Interest Rate Agreements; and 
Indebtedness that is Guaranteed or secured by WCI or any of its Restricted 
Subsidiaries) and all but the principal component of rentals in respect of 
Capitalized Lease Obligations paid, accrued or scheduled to be paid or to be 
accrued by WCI and its Restricted Subsidiaries during such period; excluding, 
however, (i) any amount of such interest of any Restricted Subsidiary if the 
net income of such Restricted Subsidiary is excluded in the calculation of 
Adjusted Consolidated Net Income pursuant to clause (iii) of the definition 
thereof (but only in the same proportion as the net income of such Restricted 
Subsidiary is excluded from the calculation of Adjusted Consolidated Net 
Income pursuant to clause (iii) of the definition thereof) and (ii) any 
premiums, fees and expenses (and any amortization thereof) payable in 
connection with the offering of the Notes, all as determined on a 
consolidated basis (without taking into account Unrestricted Subsidiaries) in 
conformity with GAAP.

                                      60

<PAGE>
 
    "Consolidated Net Worth" means, at any date of determination, 
stockholders' equity as set forth on the most recently available quarterly or 
annual consolidated balance sheet of WCI and its Restricted Subsidiaries 
(which shall be as of a date not more than 90 days prior to the date of such 
computation, and which shall not take into account Unrestricted 
Subsidiaries), less any amounts attributable to Redeemable Stock or any 
equity security convertible into or exchangeable for Indebtedness, the cost 
of treasury stock and the principal amount of any promissory notes receivable 
from the sale of the Capital Stock of WCI or any of its Restricted 
Subsidiaries, each item to be determined in conformity with GAAP (excluding 
the effects of foreign currency exchange adjustments under Financial 
Accounting Standards Board Statement of Financial Accounting Standards No. 
52).
 
    "Convertible Notes" means the 14% Convertible Senior Subordinated 
Discount Notes of WCI due 2005.
 
    "Convertible Notes Indenture" means the Indenture dated as of October 23, 
1995, between WCI and United States Trust Company of New York pursuant to 
which the Convertible Notes were issued.
 
    "Default" means any event that is, or after notice or passage of time or 
both would be, an Event of Default.
 
    "Designated Equipment" means (i) telecommunications switches and related 
equipment and inventory; (ii) customer premise equipment; (iii) radios, 
antennae and cabling; (iv) office and warehouse furniture, fixtures and 
equipment (including, without limitation, computers and communications 
equipment); (v) company service vehicles; and (vi) software related to each 
of the foregoing, in each case used in the telecommunications business of WCI 
and its Subsidiaries.
 
    "Equipment Notes" means the 12 1/2% Guaranteed Senior Secured Notes of 
WinStar Equipment Due 2004. 

    "fair market value" means the price that would be paid in an arm's-length 
transaction between an informed and willing seller under no compulsion to 
sell and an informed and willing buyer under no compulsion to buy, as 
determined in good faith by the Board of Directors (whose determination shall 
be conclusive) and evidenced by a Board Resolution.
 
    "FCC" means the United States Federal Communications Commission and any 
state or local telecommunications authority, department, commission or agency 
(and any successors thereto).
 
    "GAAP" means generally accepted accounting principles in the United 
States of America as in effect as of the date of the Indenture, including, 
without limitation, those set forth in the opinions and pronouncements of the 
Accounting Principles Board of the American Institute of Certified Public 
Accountants and statements and pronouncements of the Financial Accounting 
Standards Board or in such other statements by such other entity as approved 
by a significant segment of the accounting profession. All ratios and 
computations contained in the Indenture shall be computed in conformity with 
GAAP applied on a consistent basis, except that calculations made for 
purposes of determining compliance with the terms of the covenants and with 
other provisions of the Indentures shall be made without giving effect to (i) 
the amortization of any expenses incurred in connection with the offering of 
the Senior Notes or the Equipment Notes and (ii) except as otherwise 
provided, the amortization of any amounts required or permitted by Accounting 
Principles Board Opinion Nos. 16 and 17.
 
    "Guarantee" means any obligation, contingent or otherwise, of any Person 
directly or indirectly guaranteeing any Indebtedness or other obligation of 
any other Person and, without limiting the generality of the foregoing, any 
obligation, direct or indirect, contingent or otherwise, of such Person (i) 
to purchase or pay (or advance or supply funds for the purchase or payment 
of) such Indebtedness or other obligation of such other Person (whether 
arising by virtue of partnership arrangements, or by agreements to keep-well, 
to purchase assets, goods, securities or services, to take-or-pay, or to 
maintain financial statement conditions or otherwise) or (ii) entered into 
for purposes of assuring in any other manner the obligee of such Indebtedness 
or other obligation of the payment thereof or to protect such obligee against 
loss in respect thereof (in whole or in part); provided, however, that the 
term "Guarantee" shall not include endorsements for collection or deposit in 
the ordinary course of business. The term "Guarantee" used as a verb has a 
corresponding meaning.

                                      61 

<PAGE>
 
    "Holder" means the Person in whose name a Note is registered on the books 
of the registrar for the applicable Notes.
 
    "Incur" means, with respect to any Indebtedness, to incur, create, issue, 
assume, Guarantee or otherwise become liable for or with respect to, or 
become responsible for, the payment of, contingently or otherwise, such 
Indebtedness, including, with respect to the Company and its Restricted 
Subsidiaries, an "incurrence" of Indebtedness by reason of a Person becoming 
a Restricted Subsidiary of the Company; provided, however, that neither the 
accrual of interest nor the accretion of original issue discount shall be 
considered an Incurrence of Indebtedness.
 
    "Indebtedness" means, with respect to any Person at any date of 
determination (without duplication), (i) all indebtedness of such Person for 
borrowed money, (ii) all obligations of such Person evidenced by bonds, 
debentures, notes or other similar instruments (whether negotiable or 
non-negotiable), (iii) all obligations of such Person in respect of letters 
of credit or other similar instruments (including reimbursement obligations 
with respect thereto), (iv) all obligations of such Person to pay the 
deferred and unpaid purchase price of property or services, which purchase 
price is due more than six months after the date of placing such property in 
service or taking delivery and title thereto or the completion of such 
services, except trade payables, (v) all obligations of such Person as lessee 
under Capitalized Leases, (vi) all Indebtedness of other Persons secured by a 
Lien on any asset of such Person, whether or not such Indebtedness is assumed 
by such Person; provided, however, that the amount of such Indebtedness shall 
be the lesser of (A) the fair market value of such asset at such date of 
determination and (B) the amount of such Indebtedness, (vii) all Indebtedness 
of other Persons Guaranteed by such Person to the extent such Indebtedness is 
Guaranteed by such Person and (viii) to the extent not otherwise included in 
this definition, obligations under Currency Agreements and Interest Rate 
Agreements. The amount of Indebtedness of any Person at any date shall be the 
outstanding balance at such date of all unconditional obligations as 
described above and, with respect to contingent obligations that are included 
in any of clauses (i) through (viii) above, the maximum liability upon the 
occurrence of the contingency giving rise to the obligation; provided, 
however, that (A) the amount outstanding at any time of any Indebtedness 
issued with original issue discount is (1) for purposes of determining the 
Indebtedness to EBITDA Ratio, the face amount of such Indebtedness less the 
remaining unamortized portion of the original issue discount of such 
Indebtedness at such time as determined in conformity with GAAP and (2) for 
all other purposes, the amount determined in clause (1) on the date such 
Indebtedness is originally Incurred and (B) Indebtedness shall not include 
any liability for federal, state, local or other taxes.
 
    "Indebtedness to EBITDA Ratio" means, as at any date of determination, 
the ratio of (i) the aggregate amount of Indebtedness of WCI and its 
Restricted Subsidiaries on a consolidated basis ("Consolidated Indebtedness") 
as at the date of determination (the "Transaction Date") to (ii) the 
Consolidated EBITDA of WCI for the then most recent four full fiscal quarters 
for which reports have been filed pursuant to "--SEC Reports and Reports to 
Holders" (such four full fiscal quarter period being referred to herein as 
the "Four Quarter Period"); provided, however, that (x) pro forma effect 
shall be given to any Indebtedness Incurred from the beginning of the Four 
Quarter Period through the Transaction Date (including any Indebtedness 
Incurred on the Transaction Date), to the extent outstanding on the 
Transaction Date, (y) if during the period commencing on the first day of 
such Four Quarter Period through the Transaction Date (the "Reference 
Period"), WCI or any of the Restricted Subsidiaries shall have engaged in any 
Asset Sale, Consolidated EBITDA for such period shall be reduced by an amount 
equal to the EBITDA (if positive), or increased by an amount equal to the 
EBITDA (if negative), directly attributable to the assets which are the 
subject of such Asset Sale and any related retirement of Indebtedness as if 
such Asset Sale and related retirement of Indebtedness had occurred on the 
first day of such Reference Period or (z) if during such Reference Period WCI 
or any of the Restricted Subsidiaries shall have made any Asset Acquisition, 
Consolidated EBITDA of WCI shall be calculated on a pro forma basis as if 
such Asset Acquisition and any Incurrence of Indebtedness to finance such 
Asset Acquisition had taken place on the first day of such Reference Period.
 
    "Investment" in any Person means any direct or indirect advance, loan or 
other extension of credit (including, without limitation, by way of Guarantee 
or similar arrangement; but excluding advances to customers in the ordinary 
course of business that are, in conformity with GAAP, recorded as accounts 
receivable on the balance sheet of WCI or its Restricted Subsidiaries) or 
capital contribution to (by means of any transfer of cash or other property 
to others or any payment for property or services for the account or use of 
others), or any purchase or acquisition of Capital Stock, bonds, notes, 
debentures or other similar instruments issued by, such Person and shall 
include (i) the designation of a Restricted Subsidiary as an Unrestricted 
Subsidiary and (ii) the fair market value of the Capital Stock held by WCI 

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and the Restricted Subsidiaries of any Person that has ceased to be a 
Restricted Subsidiary by reason of any transaction permitted by clause (iii) 
of the covenant described under "--Covenants--Covenants Relating to All the 
Notes--Limitation on the Issuance and Sale of Capital Stock of Restricted 
Subsidiaries." For purposes of the definition of "Unrestricted Subsidiary" 
and the covenant described under "--Covenants--Covenants Relating to All the 
Notes--Limitation on Restricted Payments," (i) "Investment" shall include the 
fair market value of the assets (net of liabilities) of any Restricted 
Subsidiary of WCI at the time that such Restricted Subsidiary of WCI is 
designated an Unrestricted Subsidiary and shall exclude the fair market value 
of the assets (net of liabilities) of any Unrestricted Subsidiary at the time 
that such Unrestricted Subsidiary is designated a Restricted Subsidiary of 
WCI and (ii) any property transferred to or from an Unrestricted Subsidiary 
shall be valued at its fair market value at the time of such transfer, in 
each case as determined by the Board of Directors in good faith.
 
    "Lien" means any mortgage, pledge, security interest, encumbrance, lien 
or charge of any kind (including, without limitation, any conditional sale or 
other title retention agreement or lease in the nature thereof, any sale with 
recourse against the seller or any Affiliate of the seller, or any agreement 
to give any security interest).
 
    "Net Cash Proceeds" means, (a) with respect to any Asset Sale, the 
proceeds of such Asset Sale in the form of cash or cash equivalents, 
including payments in respect of deferred payment obligations (to the extent 
corresponding to the principal, but not interest, component thereof) when 
received in the form of cash or cash equivalents (except to the extent such 
obligations are financed or sold with recourse to WCI or any Restricted 
Subsidiary of WCI) and proceeds from the conversion of other property 
received when converted to cash or cash equivalents, net of (i) brokerage 
commissions and other fees and expenses (including fees and expenses of 
counsel and investment bankers) related to such Asset Sale, (ii) provisions 
for all taxes (whether or not such taxes will actually be paid or are 
payable) as a result of such Asset Sale without regard to the consolidated 
results of operations of WCI and its Restricted Subsidiaries, taken as a 
whole, (iii) payments made to repay Indebtedness or any other obligation 
outstanding at the time of such Asset Sale that either (A) is secured by a 
Lien on the property or assets sold or (B) is required to be paid as a result 
of such sale and (iv) appropriate amounts to be provided by WCI or any 
Restricted Subsidiary of WCI as a reserve against any liabilities associated 
with such Asset Sale, including, without limitation, pension and other 
post-employment benefit liabilities, liabilities related to environmental 
matters and liabilities under any indemnification obligations associated with 
such Asset Sale, all as determined in conformity with GAAP and (b) with 
respect to any issuance or sale of Capital Stock, the proceeds of such 
issuance or sale in the form of cash or cash equivalents, including payments 
in respect of deferred payment obligations (to the extent corresponding to 
the principal, but not interest, component thereof) when received in the form 
of cash or cash equivalents (except to the extent such obligations are 
financed or sold with recourse to WCI or any Restricted Subsidiary of WCI) 
and proceeds from the conversion of other property received when converted to 
cash or cash equivalents, net of attorneys' fees, accountants' fees, 
underwriters' or placement agents' fees, discounts or commissions and 
brokerage, consultant and other fees incurred in connection with such 
issuance or sale and net of taxes paid or payable by WCI or any of its 
subsidiaries as a result thereof.
 
    "Offer to Purchase" means an offer to purchase Senior Notes or Equipment 
Notes by WCI or WinStar Equipment from the Holders that is required by the 
covenant described under "--Repurchase of Notes upon a Change of Control" or 
"--Covenants--Covenants Relating to All the Notes--Limitation on Asset Sales" 
and which is commenced by mailing a notice to the relevant Trustee and each 
Holder stating: (i) the covenant pursuant to which the offer is being made 
and that all Senior Notes or Equipment Notes, as the case may be, validly 
tendered will be accepted for payment on a pro rata basis; (ii) the purchase 
price and the date of purchase (which shall be a Business Day no earlier than 
30 days nor later than 60 days from the date such notice is mailed) (the 
"Payment Date"); (iii) that any Senior Note or Equipment Note, as the case 
may be, not tendered will continue to accrue interest pursuant to its terms; 
(iv) that, unless WCI or WinStar Equipment, as the case may be, defaults in 
the payment of the purchase price, any Senior Note or Equipment Note, as the 
case may be, accepted for payment pursuant to the Offer to Purchase shall 
cease to accrue interest on and after the Payment Date; (v) that Holders 
electing to have a Senior Note or Equipment Note, as the case may be, 
purchased pursuant to the Offer to Purchase will be required to surrender the 
Senior Note or Equipment Note, as the case may be, together with the form 
entitled "Option of the Holder to Elect Purchase" on the reverse side thereof 
completed, to the Paying Agent at the address specified in the notice prior 
to the close of business on the Business Day immediately preceding the 
Payment Date; (vi) that Holders will be entitled to withdraw their election 
if the Paying Agent receives, not later than the close of business on the 
third Business Day immediately preceding the Payment Date, a telegram, 
facsimile transmission or letter setting forth the name of such Holder, the 

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Accumulated Amount of Senior Notes or the principal amount of Equipment 
Notes, as the case may be, delivered for purchase and a statement that such 
Holder is withdrawing his election to have such Senior Notes or Equipment 
Notes, as the case may be, purchased; and (vii) that Holders whose Senior 
Notes or Equipment Notes, as the case may be, are being purchased only in 
part will be issued new Senior Notes or Equipment Notes, as the case may be, 
equal in Accumulated Amount or principal amount (and accrued and unpaid 
interest) to the unpurchased portion thereof; provided, however, that each 
Senior Note or Equipment Note, as the case may be, purchased and each new 
Senior Note or Equipment Note, as the case may be, issued shall be in a 
principal amount of $1,000 or integral multiples thereof. On the Payment 
Date, WCI and WinStar Equipment shall (i) accept for payment on a pro rata 
basis Senior Notes or Equipment Notes, as the case may be, or portions 
thereof tendered pursuant to an Offer to Purchase; (ii) deposit with the 
Paying Agent money sufficient to pay the purchase price of all Senior Notes 
or Equipment Notes, as the case may be, or portions thereof so accepted; and 
(iii) deliver, or cause to be delivered, to the relevant Trustee all Senior 
Notes or Equipment Notes, as the case may be, or portions thereof so accepted 
together with an Officers' Certificate specifying the Senior Notes or 
Equipment Notes, as the case may be, or portions thereof accepted for payment 
by WCI. The Paying Agent shall promptly mail to the Holders of Senior Notes 
or Equipment Notes, as the case may be, so accepted for payment in an amount 
equal to the purchase price, and the Trustee shall promptly authenticate and 
mail to such Holders a new Senior Note or Equipment Note, as the case may be, 
equal in principal amount to any unpurchased portion of the Senior Note or 
Equipment Note, as the case may be, surrendered; provided, however, that each 
Senior Note or Equipment Note, as the case may be, purchased and each new 
Senior Note or Equipment Note, as the case may be, issued shall be in a 
principal amount of $1,000 or integral multiples thereof. WCI will publicly 
announce the results of an Offer to Purchase as soon as practicable after the 
Payment Date. The relevant Trustee shall act as the Paying Agent for an Offer 
to Purchase. WCI will comply with Rule 14e-1 under the Exchange Act and any 
other securities laws and regulations thereunder to the extent such laws and 
regulations are applicable, in the event that WCI is required to repurchase 
Senior Notes or Equipment Notes, as the case may be, pursuant to an Offer to 
Purchase.
 
    "Old Senior Notes" means the 14% Senior Discount Notes due 2005 of WCI.
 
    "Permitted Investment" means (i) an Investment in a Restricted Subsidiary 
or a Person which will, upon the making of such Investment, become a 
Restricted Subsidiary or be merged or consolidated with or into or transfer 
or convey all or substantially all its assets to, WCI or a Restricted 
Subsidiary; (ii) Temporary Cash Investments; (iii) payroll, travel and 
similar advances to cover matters that are expected at the time of such 
advances ultimately to be treated as expenses in accordance with GAAP; (iv) 
loans or advances to employees in a principal amount not to exceed $1.0 
million at any one time outstanding; (v) stock, obligations or securities 
received in satisfaction of judgments; (vi) Investments, to the extent that 
the consideration provided by WCI or any of its Restricted Subsidiaries 
consists solely of Capital Stock (other than Redeemable Stock) of WCI; (vii) 
notes payable to WCI that are received by WCI as payment of the purchase 
price for Capital Stock (other than Redeemable Stock) of WCI; and (viii) 
acquisitions of a minority equity interest in entities engaged in the 
telecommunications business; provided, however, that (A) the acquisition of a 
majority equity interest in such entities is not permitted under U.S. law 
without FCC consent, (B) the Company or one of its Restricted Subsidiaries 
has the right to acquire Capital Stock representing a majority of the voting 
power of the Voting Stock of such entity upon receipt of FCC consent and (C) 
in the event that such consent has not been obtained within 18 months of 
funding such Investment, the Company or one of its Restricted Subsidiaries 
has the right to sell such minority equity interest in the seller thereof for 
consideration consisting of the consideration originally paid by the Company 
and its Restricted Subsidiaries for such minority equity interest.
 
    "Permitted Investor" means Mr. William J. Rouhana, Jr.
 
    "Permitted Liens" means (i) Liens for taxes, assessments, governmental 
charges or claims that are being contested in good faith by appropriate legal 
proceedings promptly instituted and diligently conducted and for which a 
reserve or other appropriate provision, if any, as shall be required in 
conformity with GAAP shall have been made; (ii) statutory or common law Liens 
of landlords and carriers, warehousemen, mechanics, suppliers, materialmen, 
repairmen or other similar Liens arising in the ordinary course of business 
and with respect to amounts not yet delinquent or being contested in good 
faith by appropriate legal proceedings promptly instituted and diligently 
conducted and for which a reserve or other appropriate provision, if any, as 
shall be required in conformity with GAAP shall have been made; (iii) Liens 
incurred or deposits made in the ordinary course of business in connection 
with workers' compensation, unemployment insurance and other types of social 
security; (iv) Liens incurred or deposits 

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made to secure the performance of tenders, bids, leases, statutory or 
regulatory obligations, bankers' acceptances, surety and appeal bonds, 
government contracts, performance and return-of-money bonds and other 
obligations of a similar nature incurred in the ordinary course of business 
(exclusive of obligations for the payment of borrowed money) and a bank's 
unexercised right of set-off with respect to deposits made in the ordinary 
course; (v) easements, rights-of-way, municipal and zoning ordinances and 
similar charges, encumbrances, title defects or other irregularities that do 
not materially interfere with the ordinary course of business of WCI or any 
of its Restricted Subsidiaries; (vi) Liens (including extensions and renewals 
thereof) upon real or personal property acquired after the Closing Date; 
provided, however, that (a) such Lien is created solely for the purpose of 
securing Indebtedness Incurred, in accordance with the "Limitation on 
Indebtedness" covenant described above, (1) to finance the cost (including 
the cost of improvement or construction) of the item of property or assets 
subject thereto and such Lien is created prior to, at the time of or within 
six months after the later of the acquisition, the completion of construction 
or the commencement of full operation of such property or (2) to refinance 
any Indebtedness previously so secured, (b) the principal amount of the 
Indebtedness secured by such Lien does not exceed 100% of such cost and (c) 
any such Lien shall not extend to or cover any property or assets other than 
such item of property or assets and any improvements on such item; (vii) 
leases or subleases granted to others that do not materially interfere with 
the ordinary course of business of WCI and its Restricted Subsidiaries, taken 
as a whole; (viii) Liens encumbering property or assets under construction 
arising from progress or partial payments by a customer of WCI or its 
Restricted Subsidiaries relating to such property or assets; (ix) any 
interest or title of a lessor in the property subject to any Capitalized 
Lease or operating lease; (x) Liens arising from filing Uniform Commercial 
Code financing statements regarding leases; (xi) Liens on property of, or on 
shares of stock or Indebtedness of, any corporation existing at the time such 
corporation becomes, or becomes a part of, any Restricted Subsidiary; 
provided, however, that such Liens do not extend to or cover any property or 
assets of WCI or any Restricted Subsidiary other than the property or assets 
acquired; (xii) Liens in favor of WCI or any Restricted Subsidiary; (xiii) 
Liens arising from the rendering of a final judgment or order against WCI or 
any Restricted Subsidiary of WCI that does not give rise to an Event of 
Default; (xiv) Liens securing reimbursement obligations with respect to 
letters of credit that encumber documents and other property relating to such 
letters of credit and the products and proceeds thereof; (xv) Liens in favor 
of customs and revenue authorities arising as a matter of law to secure 
payment of customs duties in connection with the importation of goods; (xvi) 
Liens encumbering customary initial deposits and margin deposits, and other 
Liens that are either within the general parameters customary in the industry 
and incurred in the ordinary course of business, in each case, securing 
Indebtedness under Interest Rate Agreements and Currency Agreements and 
forward contracts, options, future contracts, futures options or similar 
agreements or arrangements designed to protect WCI or any of its Restricted 
Subsidiaries from fluctuations in the price of commodities; (xvii) Liens 
arising out of conditional sale, title retention, consignment or similar 
arrangements for the sale of goods entered into by WCI or any of its 
Restricted Subsidiaries in the ordinary course of business in accordance with 
the past practices of WCI and its Restricted Subsidiaries prior to the 
Closing Date; and (xviii) Liens on or sales of receivables.
 
    "Person" means any individual, corporation, partnership, limited 
liability company, joint venture, association, joint-stock company, trust, 
unincorporated organization, government or any agency or political 
subdivision thereof or any other entity.
 
    "Preferred Stock" means, with respect to any Person, any and all shares, 
interests, participations or other equivalents (however designated, whether 
voting or non-voting) of such Person's preferred or preference stock, whether 
now outstanding or issued after the Closing Date, including, without 
limitation, all series and classes of such preferred or preference stock.

    "Redeemable Stock" means any class or series of Capital Stock of any 
Person that by its terms or otherwise is (i) required to be redeemed prior to 
the Stated Maturity of the Notes, (ii) redeemable at the option of the holder 
of such class or series of Capital Stock at any time prior to the Stated 
Maturity of the Notes (unless the redemption price is, at WCI's option, 
without conditions precedent, payable solely in Common Stock (other than 
Redeemable Stock) of WCI) or (iii) convertible into or exchangeable for 
Capital Stock referred to in clause (i) or (ii) above or Indebtedness having 
a scheduled maturity prior to the Stated Maturity of the Notes; provided, 
however, that any Capital Stock that would not constitute Redeemable Stock 
but for provisions thereof giving holders thereof the right to require such 
Person to repurchase or redeem such Capital Stock upon the occurrence of an 
"asset sale" or "change of control" occurring prior to the Stated Maturity of 
the Notes shall not constitute Redeemable Stock if the "asset sale" or 
"change of control" provisions applicable to such Capital Stock are no more 
favorable to the holders of such Capital Stock than 

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the provisions contained in "--Repurchase of Notes Upon a Change of Control" 
and "--Covenants--Covenants Relating to All the Notes--Limitation on Asset 
Sales" and such Capital Stock specifically provides that such Person will not 
repurchase or redeem any such stock pursuant to such provision prior to WCI's 
repurchase of such Notes as are required to be repurchased pursuant to 
"--Repurchase of Notes Upon a Change of Control" and "--Covenants--Covenants 
Relating to All the Notes--Limitation on Asset Sales."
 
    "Restricted Subsidiary" means any Subsidiary of WCI other than an 
Unrestricted Subsidiary.
 
    "SEC" means the Securities and Exchange Commission and any successor 
agency.
 
    "Security Agreement" means the Security Agreement dated as of March 1, 
1997, between WinStar Equipment and United States Trust Company of New York, 
as collateral agent.
 
    "Security Documents" means the Security Agreement and any other 
agreements, instruments or documents entered into or delivered in connection 
with any of the foregoing, as such agreements, instruments or documents may 
from time to time be amended in accordance with the terms hereof and thereof.
 
    "Senior Notes" means the 14 1/2% Senior Deferred Interest Notes of WCI 
Due 2005.
 
    "Significant Subsidiary" means, at any date of determination, any 
Restricted Subsidiary of WCI that, together with its Subsidiaries, (i) for 
the most recent fiscal year of WCI, accounted for more than 10% of the 
consolidated revenues of WCI and its Restricted Subsidiaries or (ii) as of 
the end of such fiscal year, was the owner of more than 10% of the 
consolidated assets of WCI and its Restricted Subsidiaries, all as set forth 
on the most recently available consolidated financial statements of WCI for 
such fiscal year. For purposes of the Equipment Notes Indenture, WinStar 
Equipment will be deemed to be a Significant Subsidiary.
 
    "Stated Maturity" means, (i) with respect to any debt security, the date 
specified in such debt security as the fixed date on which the final 
installment of principal of such debt security is due and payable and (ii) 
with respect to any scheduled installment of principal of or interest on any 
debt security, the date specified in such debt security as the fixed date on 
which such installment is due and payable.
 
    "Subsidiary" means, with respect to any Person, any corporation, 
association or other business entity of which Voting Stock representing more 
than 50% of the voting power of the outstanding Voting Stock is owned, 
directly or indirectly, by such Person and one or more other Subsidiaries of 
such Person.
 
    "Telecommunications Assets" means any (i) entity or business 
substantially all the revenues of which are derived from (a) providing 
transmission of sound, data or video; (b) the sale or provision of phone 
cards, "800" services, voice mail, switching, enhanced telecommunications 
services, telephone directory or telephone number information services or 
telecommunications network intelligence; or (c) any business ancillary or 
directly related to the businesses referred to in clause (a) or (b) above and 
(ii) any assets used primarily to effect such transmission or provide the 
products or services referred to in clause (a) or (b) above and any directly 
related or ancillary assets including, without limitation, licenses and 
applications, bids and agreements to acquire licenses, or other authority to 
provide transmission services previously granted, or to be granted, by the 
FCC.
 
    "Telecommunications Subsidiary" means (i) WinStar Gateway Network, Inc., 
WinStar Wireless, Inc., WinStar Telecommunications, Inc., WinStar Milliwave, 
Inc., WinStar Locate, Inc. and WinStar Wireless Fiber Corp., and, in each 
case, its successors and (ii) any other Restricted Subsidiary of WCI that 
holds more than a DE MINIMIS amount of Telecommunications Assets.
 
    "Temporary Cash Investment" means any of the following: (i) direct 
obligations of the United States or any agency thereof or obligations fully 
and unconditionally guaranteed by the United States or any agency thereof; 
(ii) time deposit accounts, certificates of deposit and money market deposits 
maturing within 180 days of the date of acquisition thereof issued by a bank 
or trust company which is organized under the laws of the United States, any 
state thereof or any foreign country recognized by the United States, and 
which bank or trust company has capital, surplus and undivided profits 
aggregating in excess of $50.0 million (or the foreign currency equivalent 
thereof) and has 

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outstanding deposits or debt which is rated "A" (or such similar equivalent 
rating) or higher by at least one nationally recognized statistical rating 
organization (as defined in Rule 436 under the Securities Act) or any 
money-market fund sponsored by a registered broker dealer or mutual fund 
distributor; (iii) repurchase obligations with a term of not more than 30 
days for underlying securities of the types described in clause (i) above 
entered into with a bank meeting the qualifications described in clause (ii) 
above; (iv) commercial paper, maturing not more than six months after the 
date of acquisition, issued by a corporation (other than an Affiliate of WCI) 
organized and in existence under the laws of the United States, any state 
thereof or any foreign country recognized by the United States with a rating 
at the time as of which any investment therein is made of "P-1" (or higher) 
according to Moody's Investors Service, Inc. or "A-1" (or higher) according 
to Standard & Poor's Ratings Group; and (v) securities with maturities of six 
months or less from the date of acquisition issued or fully and 
unconditionally guaranteed by any state, commonwealth or territory of the 
United States, or by any political subdivision or taxing authority thereof, 
and rated at least "A" by Standard & Poor's Ratings Group or Moody's 
Investors Service, Inc.; provided, however, that, notwithstanding the 
foregoing, the maturity of any of the foregoing that is applied to provide 
security in favor of the Indebtedness referred to in clause (v) of the second 
paragraph of the "Limitation on Liens" covenant may occur as late as the 
earliest date that such Indebtedness may be redeemed at the option of the 
obligor with respect to such Indebtedness; provided further, however, that 
WCI shall cause such Liens referred to in such clause (v) to be incurred no 
later than the first anniversary of the Closing Date.
 
    "Transaction Date" means, with respect to the Incurrence of any 
Indebtedness by WCI or any of its Restricted Subsidiaries, the date such 
Indebtedness is to be Incurred and, with respect to any Restricted Payment, 
the date such Restricted Payment is to be made.
 
    "Unrestricted Subsidiary" means (i) any Subsidiary of WCI that at the 
time of determination shall be designated an Unrestricted Subsidiary by the 
Board of Directors in the manner provided below and (ii) any Subsidiary of an 
Unrestricted Subsidiary. The Board of Directors may designate any Restricted 
Subsidiary of WCI (including any newly acquired or newly formed Subsidiary of 
WCI), other than a guarantor of the Notes, to be an Unrestricted Subsidiary 
unless such Subsidiary owns any Capital Stock of, or owns or holds any Lien 
on any property of, WCI or any Restricted Subsidiary; provided, however, that 
neither WCI nor its Restricted Subsidiaries has any Guarantee of any 
Indebtedness of such Subsidiary outstanding at the time of such designation 
and either (A) the Subsidiary to be so designated has total assets of $1,000 
or less or (B) if such Subsidiary has assets greater than $1,000, such 
designation would be permitted under the covenant described under 
"--Covenants--Covenants Relating to All the Notes--Limitation on Restricted 
Payments." Notwithstanding the foregoing, WinStar New Media Company Inc., Non 
Fiction Films Inc. and WinStar Global Products, Inc. and their Subsidiaries 
are Unrestricted Subsidiaries. The Board of Directors may designate any 
Unrestricted Subsidiary to be a Restricted Subsidiary of WCI; provided, 
however, that immediately after giving effect to such designation (x) WCI 
could Incur $1.00 of additional Indebtedness under the first paragraph of the 
covenant described under "--Covenants--Covenants Relating to All the 
Notes--Limitation on Indebtedness" and (y) no Default or Event of Default 
shall have occurred and be continuing. Any such designation by the Board of 
Directors shall be evidenced to the Trustee by promptly filing with the 
Trustee a copy of the Board Resolution giving effect to such designation and 
an Officers' Certificate certifying that such designation complied with the 
foregoing provisions. Anything to the contrary contained in the Indentures 
notwithstanding, no Telecommunications Subsidiary may be designated an 
Unrestricted Subsidiary.
 
    "U.S. Government Obligations" means securities that are (i) direct 
obligations of the United States of America for the payment of which its full 
faith and credit is pledged or (ii) obligations of a Person controlled or 
supervised by and acting as an agency or instrumentality of the United States 
of America the payment of which is unconditionally guaranteed as a full faith 
and credit obligation by the United States of America, which, in either case, 
are not callable or redeemable at the option of the issuer thereof at any 
time prior to the Stated Maturity of the Notes, and shall also include a 
depositary receipt issued by a bank or trust company as custodian with 
respect to any such U.S. Government Obligation or a specific payment of 
interest on or principal of any such custodian for the account of the holder 
of a depositary receipt; provided, however, that (except as required by law) 
such custodian is not authorized to make any deduction from the amount 
payable to the holder of such depositary receipt from any amount received by 
the custodian in respect of the U.S. Government Obligation or the specific 
payment of interest on or principal of the U.S. Government Obligation 
evidenced by such depositary receipt.

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    "Voting Stock" means with respect to any Person, Capital Stock of any 
class or kind ordinarily having the power to vote for the election of 
directors, managers or other voting members of the governing body of such 
Person.
 
    "Wholly Owned" means, with respect to any Subsidiary of any Person, such 
Subsidiary if all of the outstanding Capital Stock in such Subsidiary (other 
than any director's qualifying shares or Investments by foreign nationals 
mandated by applicable law) is owned by such Person or one or more Wholly 
Owned Subsidiaries of such Person.

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            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS
 
    The following is a summary of the material United States federal income 
tax consequences of the acquisition, ownership and disposition of the New 
Notes. This summary is based on the Internal Revenue Code of 1986, as amended 
(the "Code"), existing and proposed Treasury regulations promulgated 
thereunder, and administrative and judicial interpretations thereof, all as 
in effect or proposed on the date hereof and all of which are subject to 
change, possibly with retroactive effect, or different interpretations. This 
summary assumes that all of the New Notes will be held as capital assets 
(i.e., generally assets that are held for investment), within the meaning of 
Section 1221 of the Code, and will not be part of a straddle, a hedge or a 
conversion transaction, within the meaning of Section 1258 of the Code. The 
discussion is for general information only, and does not address all of the 
tax consequences that may be relevant to particular purchasers in light of 
their personal circumstances, or to certain types of purchasers (such as 
certain financial institutions, insurance companies, tax-exempt entities or 
dealers in securities). Persons considering the exchange of Old Notes for New 
Notes should consult their tax advisors with regard to the application of the 
United States federal income tax laws to their particular situations, as well 
as any tax consequences arising under the laws of any state, local, or 
foreign taxing jurisdictions.
 
    As used in the summary which follows, the term "U.S. Holder" means a 
beneficial owner of New Notes that for United States federal income tax 
purposes is (i) a citizen or resident of the United States, (ii) a 
corporation, partnership or other entity created or organized in or under the 
laws of the United States or of any political subdivision thereof, or (iii) 
otherwise subject to United States federal income taxation on a net income 
basis with respect to worldwide income. The term "Non-U.S. Holder" means a 
holder of New Notes, that is, for United States federal income tax purposes, 
not a U.S. Holder.

    HOLDERS SHOULD CONSULT THEIR OWN TAX ADVISORS AS TO THE PARTICULAR TAX 
CONSEQUENCES TO THEM OF EXCHANGING THE OLD NOTES FOR NEW NOTES AND 
PURCHASING, HOLDING AND DISPOSING OF THE NEW NOTES, INCLUDING THE 
APPLICABILITY AND EFFECT OF ANY STATE, LOCAL OR FOREIGN TAX LAWS.
 
EXCHANGE FOR OLD NOTES
 
    The exchange by a holder of an Old Note for a New Note does not 
constitute a taxable exchange because the New Notes do not differ materially 
in kind or extent from the Old Notes. Each New Note will be treated as having 
been originally issued at the time the Old Note exchanged therefor was 
originally issued. The tax basis and holding period of each Old Note will 
carry over to the New Note issued in exchange of each Old Note.
 
Tax Consequences to U.S. Holders
 
    Payments of Interest on Equipment Notes. A U.S. Holder of a New Equipment 
Note will be required to include interest payable on a New Equipment Note as 
ordinary income as such interest accrues or is received in accordance with 
such U.S. Holder's regular method of tax accounting.
 
    ORIGINAL ISSUE DISCOUNT ON SENIOR NOTES.  The Old Senior Notes were 
issued with original issue discount, as defined in the Code. The New Senior 
Notes will similarly be treated as issued with original issue discount. The 
amount of original issue discount on a debt instrument, within the meaning of 
Section 1273 of the Code, is the excess (if any) of its "stated redemption 
price at maturity" over its issue price. The issue price of the Old Senior 
Notes was the respective offering price to the purchasers (not including any 
sales to a bond house, broker, or similar person or organization acting in 
the capacity of an underwriter, placement agent or wholesaler) at which a 
substantial amount of the Senior Notes was sold. According to the Treasury 
Regulations, the issue price of the Senior Notes does not change even if part 
of the issue is subsequently sold at a different price. The "stated 
redemption price at maturity" of a debt instrument is the sum of its 
principal amount plus all other payments required thereunder, other than 
payments of "qualified stated interest" (defined generally as stated interest 
that is unconditionally payable in cash or in property (other than the debt 
instruments of the issuer), at least annually at a single fixed rate that 
appropriately takes into account the length of intervals between payments). 
Because interest on the New Senior Notes is not payable in cash until April 
15, 2001, the stated interest on the New Senior Notes will not be treated as 
qualified stated interest, but will, for United States federal income tax 
purposes, be added to the stated redemption price at maturity of the New 

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Senior Notes. As a result, the New Senior Notes will be treated as having 
been issued with original issue discount equal to the excess of their stated 
redemption price at maturity over their issue price.
 
    Each U.S. Holder of a New Senior Note (regardless of whether such U.S. 
Holder is a cash or an accrual basis taxpayer) will be required to include in 
such U.S. Holder's gross income in each taxable year, in advance of the 
receipt of cash payments attributable to such income, that portion of the 
original issue discount, computed on a constant yield basis, attributable to 
each day during such taxable year on which the U.S. Holder held the New 
Senior Note. In general, under Section 1272 of the Code, the amount of 
original issue discount that a holder of a debt instrument must include in 
gross income for United States federal income tax purposes will be the sum of 
the daily portions of original issue discount with respect to such debt 
instrument for each day during the taxable year or portion of a taxable year 
in which such holder holds the debt instrument. The daily portion is 
determined under a constant yield method by allocating to each day of an 
accrual period a pro rata portion of an amount equal to the "adjusted issue 
price" of the debt instrument at the beginning of the accrual period 
multiplied by the yield to maturity of the debt instrument (stated in a 
manner appropriately taking into account the length of the accrual period). 
Accrual periods with respect to a New Senior Note may be of any length 
selected by the U.S. Holder and may vary in length over the term of the New 
Senior Note as long as (i) no accrual period is longer than one year and (ii) 
each scheduled payment of interest or principal on the New Senior Note occurs 
on either the final or first day of an accrual period. The yield to maturity 
of a debt instrument is the discount rate that, when applied to all payments 
due under the debt instrument produces a present value equal to the issue 
price of the debt instrument. The "adjusted issue price" is the issue price 
of the debt instrument increased by the accrued original issue discount for 
all prior accrual periods (and decreased by the amount of cash payments made 
in all prior accrual periods).
 
    U.S. Holders of New Senior Notes should be aware that, because of the 
above original issue discount rules, a U.S. Holder of a New Senior Note will 
be required for United States federal income tax purposes to include amounts 
in ordinary income in advance of the receipt of the cash attributable to such 
income.
 
    The New Equipment Notes were not issued with original issue discount as 
stated interest is unconditionally payable in cash semiannually throughout 
the life of the instrument.
 
    ACQUISITION PREMIUM.  If a U.S. Holder of a New Senior Note acquired the 
Old Senior Note at a cost in excess of its "adjusted issue price" (as defined 
above) but less than its stated redemption price at maturity, such New Senior 
Note will continue to have an acquisition premium to the extent of such 
excess. Under the acquisition premium rules of the Code and the Treasury 
Regulations promulgated thereunder, the amount of the original issue discount 
which such U.S. Holder must include in its gross income with respect to such 
New Senior Note for any taxable year will be reduced by the portion of such 
acquisition premium properly allocable to such year.
 
    MARKET DISCOUNT.  If a U.S. Holder purchased Old Notes for an amount that 
is less than the "revised issue price" of the Old Notes at the time of 
acquisition, the amount of such difference will be treated as "market 
discount" for United States federal income tax purposes, unless such 
difference is less than a specified DE MINIMIS amount ("DE MINIMIS market 
discount"). The "revised issue price" is the original issue price of an Old 
Note plus the aggregate amount of previously accrued original issue discount 
(in the case of a Senior Note), without regard to any reductions for 
acquisition premium, less payments other than qualified stated interest. 
Under the market discount rules, a holder will be required to treat any 
principal payment on, or any gain on the sale, exchange, retirement or other 
disposition of, New Notes as ordinary income to the extent of the market 
discount which has not previously been included in income and is treated as 
having accrued on such New Notes at the time of such payment or disposition. 
If a holder makes a gift of a New Note, accrued market discount, if any, will 
be recognized as if such holder had sold such New Note for a price equal to 
its fair market value. In addition, the holder may be required to defer, 
until the maturity of the New Notes or the earlier disposition of the New 
Notes in a taxable transaction, the deduction of a portion of the interest 
expense on any indebtedness incurred or continued to purchase or carry such 
New Notes.
 
    Any market discount will be considered to accrue on a straight-line basis 
during the period from the date of acquisition to the maturity date of the 
New Notes, unless a holder elects to accrue market discount on a constant 
interest method. A holder of New Notes may elect to include market discount 
in income currently as it accrues (on either a straight-line basis or 
constant interest method), in which case the rules described above regarding 
the deferral of interest deductions and ordinary income treatment of gain on 
disposition will not apply. This election to include 

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market discount in income currently, once made, applies to all market 
discount obligations acquired on or after the first day of the first taxable 
year to which the election applies and may not be revoked without the consent 
of the Service.
 
    AMORTIZABLE BOND PREMIUM.  Generally, if the tax basis (generally, the 
purchase price) of an Old Equipment Note held as a capital asset exceeds the 
amount payable at maturity of the obligation, such excess will constitute 
amortizable bond premium that the holder may elect, under Section 171 of the 
Code, to amortize under the constant yield method over the period from its 
acquisition date to the obligation's maturity date. A holder of a New 
Equipment Note who elects to amortize bond premium must reduce its tax basis 
in the related New Equipment Note by the amount of the aggregate amortization 
allowable for amortizable bond premium. Amortizable bond premium will be 
treated under the Code as an offset to interest income on the New Equipment 
Note for United States federal income tax purposes. An election to amortize 
bond premium on a New Equipment Note generally applies to all bonds held by 
the holder at the beginning of the first taxable year to which the election 
applies or thereafter acquired, and may not be revoked without the consent of 
the Service.
 
    SALE OR OTHER DISPOSITION.  In general, a U.S. Holder of a New Note will 
recognize gain or loss upon the sale, exchange, redemption, or other taxable 
disposition of such New Note measured by the difference between (i) the 
amount of cash and the fair market value of property received (except, in the 
case of Equipment Notes, to the extent attributable to accrued but unpaid 
interest) and (ii) the U.S. Holder's adjusted tax basis in the New Note. A 
U.S. Holder's adjusted tax basis for determining gain or loss on the sale or 
other disposition of a New Note will initially equal the cost of the Old Note 
to such U.S. Holder and will be increased by any accrued original issue 
discount (net of all amortized acquisition premium) and any market discount 
includable in such U.S. Holder's gross income and decreased by the amount of 
any cash payments received by such U.S. Holder regardless of whether such 
payments are denominated as principal or interest (other than payments of 
qualified stated interest) and amortizable bond premium, if any, deducted 
over the term of the New Notes. Subject to the market discount rules 
discussed above, any such gain or loss will generally be long-term capital 
gain or loss, provided the New Notes have been held for more than one year.
 
    Elections. A U.S. Holder of New Notes, subject to certain limitations, 
may elect to include all stated and unstated interest and discount on the New 
Notes in gross income under the constant yield method. For this purpose, 
interest includes original issue discount, DE MINIMIS market discount and 
market discount, as adjusted by any amortizable bond premium or acquisition 
premium. Any such election, if made in respect of a market discount bond, 
will constitute an election to include market discount in income currently on 
all market discount bonds acquired by such U.S. Holder on or after the first 
day of the first taxable year to which the election applies. See "--Market 
Discount." U.S. Holders should consult with their tax advisors regarding any 
tax elections they intend to make with respect to any Notes.
 
    APPLICABLE HIGH YIELD DISCOUNT RULES.  Generally, under Section 163(e)(5) 
of the Code, original issue discount is not deductible until paid in cash or 
property (other than issuer debt or stock) with respect to any "applicable 
high yield discount obligations" ("AHYDOs") issued by a corporation. A New 
Senior Note will continue to constitute an AHYDO since the Old Senior Note it 
is replacing (i) had a maturity date which is more than five years from the 
date of issue, (ii) had a yield to maturity which equals or exceeds the sum 
of five percentage points plus the "applicable federal rate" ("AFR") for the 
calendar month in which the obligation was issued and (iii) had "significant 
original issue discount" (as defined in Section 163(i)(2) of the Code). (The 
AFR for the month of March 1997 was 6.32% for instruments with a weighted 
average maturity in excess of three years but not in excess of nine years 
providing semiannual compounding.) Since the New Senior Notes continue to be 
AHYDOs, (i) the product of the total original issue discount under the New 
Senior Notes times the ratio of (a) the excess of the yield to maturity over 
the sum of the AFR plus six percentage points to (b) the yield to maturity 
will not be deductible by the Company and will be treated for some purposes 
as dividends to corporate holders of the New Senior Notes (to the extent that 
the Company has sufficient current or accumulated earnings and profits for 
federal income tax purposes that such nondeductible amounts would have been 
treated as dividends if they had been distributions with respect to the 
Company's stock), and (ii) any original issue discount for which the 
Company's deductions are not disallowed under clause (i) above will not be 
deductible by the Company until actually paid. Amounts treated as dividends 
under clause (i) will be nondeductible by the Company, and may qualify for 
the dividends received deduction for corporate holders, but should be treated 
as original issue discount and must be included in income, as described 
above. The Company believes that it does not presently have any current or 
accumulated earnings and profits and it cannot predict whether it will have 
any earnings and profits for future years. As such, in any year in which the 
Company has no earnings and profits, the 

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nondeductible portion in clause (i) relating to such year would not be 
eligible for the dividends received deduction in the case of corporate 
holders.     

    INFORMATION REPORTING AND BACKUP WITHHOLDING.  The Company will report 
annually to the Service and to non-corporate record holders of the New Notes 
amounts of interest paid and original issue discount accrued during the 
calendar year. The "backup" withholding and information reporting 
requirements may apply to certain payments of principal and interest 
(including original issue discount) on a New Note and to certain payments of 
proceeds on the sale or retirement of a New Note. The Company, its agent, a 
broker, the Trustee or any paying agent, as the case may be, will be required 
to withhold tax from any payment that is subject to backup withholding at a 
rate of 31% if the U.S. Holder, among other things, (i) fails to furnish his 
or her social security number or other taxpayer identification number ("TIN") 
to the payor responsible for backup withholding, (ii) furnishes to such payor 
an incorrect TIN, (iii) fails to provide such payor with a certified 
statement, signed under penalties of perjury, that the TIN provided to the 
payor is correct and that the U.S. Holder is not subject to backup 
withholding or (iv) fails to report properly interest and dividends on his or 
her tax return. A holder who does not provide the Company or the applicable 
reporting entity with his or her correct TIN may be subject to penalties 
under the Code. Certain holders, including corporations, are not subject to 
backup withholding if their exempt status is properly established.
 
    Backup withholding is not an additional tax. The amount of any backup 
withholding from a payment to a U.S. Holder will be allowed as a credit 
against such holder's United States federal income tax liability and may 
entitle such holder to a refund, provided that the required information is 
furnished to the Service.
 
Tax Consequences to Non-U.S. Holders
 
    PORTFOLIO INTEREST EXEMPTION
 
    A Non-U.S. Holder will generally, under the portfolio interest exemption 
of the Code, not be subject to United States federal income taxes and/or 
United States federal withholding tax, on payments of principal, premium, if 
any, and interest (including original issue discount) on the New Notes, 
provided that (in the case of interest, including original issue discount) 
(i) the Non-U.S. Holder does not actually or constructively own 10% or more 
of the total combined voting power of all classes of stock of the Company 
entitled to vote, (ii) the Non-U.S. Holder is not a controlled foreign 
corporation that is related to the Company through stock ownership, (iii) 
such original issue discount or interest is not effectively connected with a 
United States trade or business of the Non-U.S. Holder and (iv) either (a) 
the beneficial owner of the New Notes certifies to the Company or its agent, 
under penalties of perjury, that it is a Non-U.S. Holder and provides a 
completed IRS Form W-8 ("Certificate of Foreign Status") or (b) a securities 
clearing organization, bank or other financial institution which holds 
customers' securities in the ordinary course of its trade or business (a 
"financial institution") and holds the New Notes, certifies to the Company or 
its agent, under penalties of perjury, that it has received Form W-8 from the 
beneficial owner or that it has received from another financial institution a 
Form W-8 and furnishes the payor with a copy thereof. If any of the 
situations described in proviso (i), (ii) or (iv) of the preceding sentence 
do not exist, interest on the New Notes when received is subject to United 
States withholding tax at the rate of 30% unless an income tax treaty between 
the United States and the country of which the Non-U.S. Holder is a tax 
resident provides for the elimination or reduction in the rate of United 
States federal withholding tax. Recently proposed Treasury Regulations (the 
"Proposed Regulations") would provide alternative methods for satisfying the 
certification requirement described in clause (iv)(a) and (b). The Proposed 
Regulations are proposed to be effective for payments made after December 31, 
1997. There can be no assurance that the Proposed Regulations will be adopted 
or as to the provisions they will include if and when adopted in temporary or 
final form.
 
    If a Non-U.S. Holder of a New Note is engaged in a trade or business in 
the United States and interest (including original issue discount) on the New 
Note is effectively connected with the conduct of such trade or business, 
such holder, although exempt from United States federal withholding tax by 
reason of the delivery of a properly completed Form 4224, will be subject to 
United States federal income tax on such interest (including original issue 
discount) and on any gain realized on the sale, exchange or other disposition 
of a New Note in the same manner as if it were a U.S. Holder. In addition, if 
such Non-U.S. Holder is a foreign corporation, it may be subject to a branch 
profits tax equal to 30% of its effectively connected earnings and profits 
for that taxable year, unless it qualifies for a lower rate under an 
applicable income tax treaty.

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    FEDERAL ESTATE TAX
 
    New Notes owned or treated as owned by an individual who is neither a 
United States citizen nor a United States resident (as defined for United 
States federal estate tax purposes) at the time of death will be excluded 
from the individual's gross estate for the United States federal estate tax 
purposes and will not be subject to United States federal estate tax if the 
nonresident qualifies for the portfolio interest exemption (without regard to 
the certification requirements) discussed above.
 
    SALE OF NOTES
 
    A Non-U.S. Holder generally will not be subject to United States federal 
income tax on any gain realized in connection with the sale, exchange or 
retirement of New Notes, unless (i) (a) the gain is effectively connected 
with a trade or business carried on by the Non-U.S. Holder within the United 
States or (b) if a tax treaty applies, the gain is attributable to the United 
States permanent establishment maintained by the Non-U.S. Holder, (ii) in the 
case of a Non-U.S. Holder who is an individual, such holder is present in the 
United States for 183 days or more in the taxable year of disposition and 
certain other conditions are satisfied, or (iii) the Non-U.S. Holder is 
subject to tax pursuant to provisions of the Code applicable to United States 
expatriates.
 
    INFORMATION REPORTING AND BACKUP WITHHOLDING
 
    In general, there is no United States information reporting requirement 
or backup withholding tax on payments to Non-U.S. Holders who provide the 
appropriate certification described above regarding qualification for the 
portfolio interest exemption from United States federal income tax for 
payments of principal or interest (including original interest discount) on 
the New Notes.
 
    Payment by the Company of principal on the New Notes or payment by a 
United States office of a broker of the proceeds of a sale of New Notes is 
subject to both backup withholding and information reporting unless the 
beneficial owner provides a completed IRS Form W-8 which certifies under 
penalties of perjury that such owner is a Non-U.S. Holder who meets all the 
requirements for exemption from United States federal income tax on any gain 
from the sale, exchange or retirement of the New Notes.
 
    In general, backup withholding and information reporting will not apply 
to a payment of the gross proceeds of a sale of New Notes effected at a 
foreign office of a broker. If, however, such broker is, for United States 
federal income tax purposes, a U.S. person, a controlled foreign corporation 
or a foreign person 50% or more of whose gross income for certain periods is 
derived from activities that are effectively connected with the conduct of a 
trade or business in the United States, such payments will not be subject to 
backup withholding, but will be subject to information reporting unless (i) 
such broker has documentary evidence in its records that the beneficial owner 
is a Non-U.S. Holder and certain other conditions are met, or (ii) the 
beneficial owner otherwise establishes an exemption, provided such broker 
does not have actual knowledge that the payee is a United States person. 
Non-U.S. Holders should consult their tax advisors regarding the application 
of these rules to their particular situations, the availability of an 
exemption therefrom and the procedure for obtaining such an exemption, if 
available.
 
    Backup withholding is not an additional tax. Any amounts withheld under 
the backup withholding rules will be allowed as a credit against such 
holder's United States federal income tax liability and may entitle such 
holder to a refund, provided the required information is furnished to the 
Service.

    THE FOREGOING SUMMARY DOES NOT DISCUSS ALL ASPECTS OF UNITED STATES 
FEDERAL INCOME TAXATION THAT MAY BE RELEVANT TO A PARTICULAR HOLDER OF NOTES 
IN LIGHT OF ITS PARTICULAR CIRCUMSTANCES AND INCOME TAX SITUATION. HOLDERS 
SHOULD CONSULT THEIR OWN TAX ADVISOR AS TO THE SPECIFIC TAX CONSEQUENCES TO 
THEM FROM THE EXCHANGE OF OLD NOTES FOR NEW NOTES AND PURCHASE, OWNERSHIP AND 
DISPOSITION OF THE NEW NOTES, INCLUDING THE APPLICATION AND EFFECT OF STATE, 
LOCAL, FOREIGN AND OTHER TAX LAWS AND THE POSSIBLE EFFECTS OF CHANGES IN 
FEDERAL OR OTHER TAX LAWS.

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<PAGE> 
 
            DESCRIPTION OF CERTAIN INDEBTEDNESS AND PREFERRED STOCK
 
INDEBTEDNESS
 
    In October 1995, the Company raised net proceeds of $214.5 million from 
the 1995 Debt Placement. The 1995 Notes will not accrue interest prior to 
October 15, 2000, nor pay cash interest prior to April 15, 2001; however, the 
principal value of the 1995 Notes have accreted since issuance and at 
maturity the 1995 Senior Notes and the Convertible Notes will have aggregate 
principal amounts of $294.2 million and $147.1 million, respectively. From 
and after October 15, 2000, the 1995 Notes will accrue interest at the rate 
of 14% per annum, payable semiannually in cash commencing April 15, 2001. The 
1995 Notes mature on October 15, 2005.
 
    The Convertible Notes are convertible, at any time, at the option of the 
holder, into that number of shares of Common Stock derived by dividing the 
principal amount of the Convertible Notes being converted by $20.625. In 
addition, if the closing sale price of the Common Stock on the Nasdaq 
National Market during any twelve-month period from October 15, 1995 through 
October 15, 1999 (each a "Market Criteria Period") has exceeded the Market 
Criteria (as defined in the Indenture governing the Convertible Notes) and a 
registration statement with respect to Common Stock issuable upon conversion 
of the Convertible Notes ("Conversion Shares") is effective and available, 
all of the Convertible Notes automatically will be converted into Conversion 
Shares at the close of business on the last day of the Market Criteria 
Period. The Company has caused to be declared effective a registration 
statement registering the issuance or resale of the Conversion Shares.
 
    The 1995 Indentures contain certain covenants which, among other things, 
restrict the ability of the Company and certain of its subsidiaries to: incur 
additional indebtedness; create liens; engage in sale-leaseback transactions; 
pay dividends or make distributions in respect of their capital stock; make 
investments or certain other restricted payments; sell assets; issue or sell 
stock of such subsidiaries; enter into transactions with stockholders or 
affiliates; acquire assets or businesses not constituting "telecommunications 
assets" (as defined in the 1995 Indentures); or consolidate, merge or sell 
all or substantially all of their assets. The covenants contained in the 
Indentures are subject to exceptions and the Company's new media and consumer 
products subsidiaries are not subject to many of the covenants contained 
therein, although the Company's ability to make additional investments in 
such subsidiaries is limited.
 
    In September 1995, the Company's wholly owned subsidiary, WinStar 
Wireless, Inc. ("WinStar Wireless") entered into an equipment lease financing 
arrangement (the "Equipment Lease Financing") with ML Investors Services, 
Inc. ("ML"), pursuant to which ML has made available $7.0 million in 
equipment financing. Pursuant to a master lease agreement between WinStar 
Wireless and ML entered into in connection with the Equipment Lease 
Financing, WinStar Wireless has leased transceivers and related network 
equipment from ML or its assignee at the rate of 2.2753% of the equipment 
value per month (a return of approximately 13% per annum to the lessor), 
which lease payment obligations are non-cancelable for sixty months. After 
twelve months WinStar Wireless may purchase the equipment at scheduled rates 
which decline over the term of the lease and provide for a return of 
approximately 15% per annum to the lessor. WinStar Wireless' obligations 
under the lease are guaranteed by the Company. As additional consideration 
for providing the Equipment Lease Financing, the Company has issued to ML 
options to purchase 55,000 shares of Common Stock at an exercise price of 
$17.125 per share and options to purchase 15,000 shares of Common Stock at an 
exercise price of $18.0625 per share.
 
    In November 1994, WinStar Gateway entered into a Loan and Security 
Agreement ("CIT Loan Agreement") with The CIT Group/Credit Finance, Inc. 
("CIT"), pursuant to which CIT agreed to make a $5.0 million revolving credit 
facility (the "CIT Credit Facility") available to WinStar Gateway until 
November 1998 as extended. Pursuant to the terms of the CIT Loan Agreement, 
borrowings are limited to 90% of the most eligible accounts receivable with 
eligibility of certain types of accounts receivable limited to 80% and 50% 
(less appropriate reserves as determined by CIT). In addition, WinStar 
Gateway is prohibited from paying dividends to the Company. The Company also 
is party to a keepwell agreement requiring the Company to make a monthly 
contribution to WinStar Gateway in an amount equal to the amount by which 
WinStar Gateway's net income (loss) before depreciation and amortization 
minus its capital expenditures is less than zero for a particular month. 
Borrowings bear interest at a rate of 1.75% in excess of the prime commercial 
lending rate of The Chase Manhattan Bank, N.A. subject to increase if WinStar 
Gateway's or the Company's net worth (as defined) drops below specified 
amounts, and are secured by a lien on all of WinStar Gateway's assets as well 
as a guarantee by the Company as to the first $2.2 million in borrowings. The 
CIT Loan 

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Agreement also provides for certain underutilization fees and subordinates a 
$5 million revolving credit facility made by the Company to WinStar Gateway. 
As additional consideration for providing the CIT Credit Facility, the 
Company issued to CIT warrants to purchase 50,000 shares of Common Stock, 
which warrants have been exercised.
 
    In August 1996, WinStar Global Products entered into an Amended and 
Restated Credit and Security Agreement (as amended, the "Credit Agreement") 
with IBJ Schroder Bank & Trust Company ("IBJ"), pursuant to which IBJ agreed 
to make a $12.0 million revolving credit facility (the "Revolving Credit 
Facility") and a $250,000 Letter of Credit facility (included within the 
Revolving Credit Facility) available to WinStar Global Products until August 
8, 1999. Pursuant to the terms of the Credit Agreement, borrowings are 
limited to an amount equal to the sum of (a) 85% of eligible accounts 
receivable plus (b) the lesser of 50% of eligible inventory or $4,500,000 
plus (c) for the period commencing March 1 of each year through January 31 of 
the following year, $3.0 million (the "Overadvance"). Borrowings bear 
interest at a rate of 0.75% in excess of the base lending rate of IBJ and are 
secured by a lien on all of the assets of WinStar Global Products as well as 
a guaranty by the Company of any amounts borrowed as an Overadvance. The 
Credit Agreement also requires the payment of certain periodic fees by 
WinStar Global Products, contains certain affirmative and negative covenants 
including restrictions upon WinStar Global Products' ability to pay dividends 
or make other payments to the Company and subordinates a $3.1 million loan 
made by the Company to WinStar Global Products. The Credit Agreement amends 
and restates a loan agreement providing a $6.0 million credit facility from 
Century Business Credit Corporation ("Century") which was established in 1994 
and assigned (including all security interests and a $3.0 million guaranty 
given by the Company) by Century to IBJ.
 
    The Company's subsidiaries have entered into, and will continue to seek, 
financing arrangements with respect to equipment, including 
telecommunications switches, 38 GHz radios and other related equipment. The 
Company's subsidiary, WinStar Telecommunications, Inc., consummated a $3.1 
million sale/leaseback of its New York City switch in December 1996 and a 
$3.8 million sale/leaseback of its Los Angeles switch in April 1997 and 
borrowed approximately $3.3 million from a third party lender in connection 
with its purchase of its Chicago switch in March 1997. In May 1997, the 
Company's subsidiary, WinStar Wireless, Inc., consummated a $10 million 
sale/leaseback of 38 GHZ radios. The Company may enter into additional 
financing arrangements for switches, radios and other equipment on similar 
terms in the future.
 
    In connection with the 1997 Debt Placement, in order to provide 
additional future liquidity to the Company, the Company obtained a $150 
million facility from affiliates of the Initial Purchasers in March 1997. The 
Company continues to have available $100 million of such facility (the 
issuance in August 1997 by WinStar Equipment II Corp., a wholly owned 
subsidiary of the Company, of certain notes having reduced availability by 
$50 million), which subject to the Company satisfying various operating and 
financial criteria, may be drawn by the Company on March 31, 1999. The amount 
of the commitment may be further reduced in certain circumstances, including 
as a result of the issuance of additional securities by the Company prior to 
March 31, 1999.
 
PREFERRED STOCK
 
    SERIES A PREFERRED STOCK
 
    On February 6, 1997, the Company and its wholly owned subsidiary, WinStar 
Credit Corp. ("WCC"), entered into a Securities Purchase Agreement with 
certain purchasers, pursuant to which the Company and WCC agreed to sell to 
such purchasers an aggregate of 4,000,000 shares of the Company's Series A 
Convertible Preferred Stock ("Series A Preferred Stock") and warrants to 
purchase 1,600,000 shares of the Company's Common Stock (the "Warrants") for 
an aggregate purchase price of $100.0 million. The Preferred Stock Placement 
was consummated on February 11, 1997. The Preferred Stock Placement was 
conducted through Credit Suisse First Boston Corporation, which acted as 
placement agent and received customary fees for acting in such capacity. The 
principal purpose of the Preferred Stock Placement was to raise proceeds to 
fund the expansion of the Company's telecommunications and other operations.
 
    Each share of Series A Preferred Stock has a stated value of $25 ("Stated 
Value") and entitles the holder thereof to receive from the Company dividends 
at a rate per annum equal to 6% of the Stated Value. Dividends accrue and are 
cumulative from the date of issuance and are payable in arrears quarterly as 
of March 31, June 30, September 30 and December 31 of each year. The Company 
may, at its election, pay such dividends in cash or through the issuance of 
additional shares of Series A Preferred Stock. To date, the Company has 
issued 93,836 shares of 

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<PAGE>

Preferred stock in payment of in-kind dividends on such stock. The Company 
has not paid any cash dividends on the Preferred Stock.
 
    The shares of Series A Preferred Stock are convertible into shares of 
Common Stock commencing August 11, 1997 by dividing the aggregate Stated 
Value of the Series A Preferred Stock being converted by the Conversion Price 
(as defined below); provided, however, that from August 11, 1997 through 
November 10, 1997, only 50% of the Series A Preferred Stock may be converted. 
Subject to certain adjustments, the "Conversion Price" will be: (i) with 
respect to any conversion of Series A Preferred Stock occurring prior to 
February 11, 1998, the lesser of (x) $25 and (y) the average of the closing 
bid prices for the Common Stock for the 20 consecutive trading days 
immediately preceding the date of conversion and (ii) with respect to any 
conversion of the Series A Preferred Stock occurring on or after February 11, 
1998, the lesser of (x) $25 and (y) the average of the closing bid prices for 
the 20 consecutive trading days immediately preceding February 11, 1998. 
Notwithstanding the foregoing, if a holder of Series A Preferred Stock 
requests conversion at a time when the Conversion Price is less than $15, the 
Company may (subject to certain notice requirements), in lieu of converting 
such Series A Preferred Stock into shares of Common Stock, pay such holder in 
cash an amount equal to 110% of the Liquidation Preference (as defined below) 
for each share of Series A Preferred Stock requested to be converted. On 
February 11, 2002, any Series A Preferred Stock still outstanding shall be 
automatically converted into shares of Common Stock, unless the Company 
elects to pay cash therefor in an amount equal to the Stated Value plus all 
accrued and unpaid dividends thereon (the "Liquidation Preference"). Unless 
paid for in cash, such conversion will be effected by delivery of shares of 
Common Stock having a value, based upon the closing bid prices for the Common 
Stock for the 20 consecutive trading days ending one trading day prior to 
such conversion date, equal to the Liquidation Preference.
 
    The Warrants entitle the holders thereof to purchase an aggregate of 
1,600,000 shares of Common Stock for $25 per share at any time commencing 
February 11, 1998 and ending February 11, 2002. The Company may accelerate 
the expiration date at any time after February 11, 2000 if Common Stock 
trades at $40 or more for a period of 20 consecutive days. 

    The Company and the purchasers of the Series A Preferred Stock also 
entered into a Registration Rights Agreement, dated February 6, 1997 (the 
"Preferred Stock Registration Rights Agreement"), pursuant to which the 
Company is obligated to file a registration statement under the Securities 
Act, registering (i) the resale of the Series A Preferred Stock and Warrants 
and (ii) the issuance by the Company of the shares of Common Stock issuable 
upon exercise of the Warrants, and to have such registration statement 
declared effective by the Securities and Exchange Commission ("SEC") on or 
prior to August 15, 1997. If such registration statement is not declared 
effective by the SEC by August 15, 1997, the dividend rate of the Series A 
Preferred Stock shall increase to 6.5% per annum until the default under the 
Preferred Stock Registration Rights Agreement is cured. Additionally, at any 
time after May 11, 1997, each holder of the Series A Preferred Stock may 
demand that the Company file and have declared effective within 90 days of 
such demand a registration statement registering the resale of the shares of 
Common Stock issuable upon conversion of the Series A Preferred Stock; 
provided, however, that the Company will not be required to file more than 
two such registration statements. If such later registration statement is not 
declared effective by the SEC within the applicable 90-day period, the 
Company will be required to pay to the holders of the Series A Preferred 
Stock who made the demand an amount equal to 2% of the Liquidation Preference 
of their shares of Series A Preferred Stock for each month until the default 
is cured. Such penalty is payable at the Company's election in cash or 
through the issuance of additional shares of Series A Preferred Stock.
 
    RIGHTS TO PURCHASE SERIES B PREFERRED STOCK
 
    The following is a summary of the Rights Agreement dated as of July 2, 
1997 (the "Rights Plan") between Company and Continental Stock Transfer & 
Trust Company as Rights Agent, which was adopted by the Board of Directors of 
the Company on July 2, 1997. This summary of the Rights Plan does not purport 
to be complete and is qualified in its entirety by reference to the 
provisions of the Rights Plan.
 
    Under the Rights Plan, holders of Common Stock of the Company received, 
as a dividend, preferred stock purchase rights (the "Rights") at the rate of 
one Right for each share of Common Stock held as of the close of business on 
July 14, 1997. One Right will also attach to each share of Common Stock 
issued thereafter (including shares issued pursuant to this Prospectus). 
Currently the Rights are not separate from the Common Stock and one not 
exercisable 

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<PAGE>

and will only separate from the Common Stock and become exercisable if a 
person or group acquires 10% or more of the Company's outstanding Common 
Stock (an "Acquiring Person") or launches a tender or exchange offer that 
would result in ownership of 10% or more the Company's outstanding Common 
Stock. Each Right that is not owned by an Acquiring Person entitles the 
holder of the Right to buy one one-thousandth of one share (a "Unit") of 
Series B Preferred Stock which will be issued by the Company. If any person 
becomes an Acquiring Person, or if an Acquiring Person engages in certain 
transactions involving conflicts of interest or in a business combination in 
which the Company's Common Stock remains outstanding, then the Rights Plan 
provides that each Right, other than any Right held by the Acquiring Person, 
entitles the holder to purchase, for $70, Units with a market value of $140. 
However, if the Company is involved in a business combination in which the 
Company itself is not the survivor, or if the Company sells 50% or more of 
its assets or earning power to another person, then the Rights Plan provides 
that each Right entitled the holder to purchase, for $70, shares of the 
common stock of the Acquiring Person's ultimate parent having a market value 
of $140.
 
    At any time until ten days following the date on which a person acquires 
10% or more of the Company's Common Stock, the Company may redeem all (but 
not less than all) of the Rights for $0.0001 per Right. The Rights expire in 
ten years. The Series B Preferred Stock will be junior, with respect to 
dividends and liquidation rights, to any other series of preferred stock of 
the Company. The Series B Preferred Stock has dividend and liquidation 
preferences over the Common Stock of the Company.
 
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<PAGE>
                              PLAN OF DISTRIBUTION
 
    Each broker-dealer that receives New Notes for its own account pursuant 
to an Exchange Offer must acknowledge that it will deliver a prospectus in 
connection with any resale of such New Notes. This Prospectus, as it may be 
amended or supplemented from time to time, may be used by a broker-dealer in 
connection with resales of New Notes received in exchange for Old Notes where 
such Old Notes were acquired as a result of market-making activities or other 
trading activities. The Issuers have agreed that, for a period of 180 days 
after the Expiration Date (or such longer period as required by the terms of 
the Registration Rights Agreement), it will make this Prospectus, as amended 
or supplemented, available to any broker-dealer for use in connection with 
any such resale. In addition, until November 9, 1997 all dealers effecting 
transactions in the New Notes may be required to deliver a prospectus.
 
    The Issuers will not receive any proceeds from any sale of New Notes by 
broker-dealers. New Notes received by broker-dealers for their own account 
pursuant to an Exchange Offer may be sold from time to time in one or more 
transactions in the over-the-counter market, in negotiated transactions, 
through the writing of options on the New Notes or a combination of such 
methods of resale, at market prices prevailing at the time of resale, at 
prices related to such prevailing market prices or negotiated prices. Any 
such resale may be made directly to purchasers or to or through brokers or 
dealers who may receive compensation in the form of commissions or 
concessions from any such broker-dealer or the purchasers of any such New 
Notes. Any broker-dealer that resells New Notes that were received by it for 
is own account pursuant to an Exchange Offer and any broker or dealer that 
participates in a distribution of such New Notes may be deemed to be an 
"underwriter" within the meaning of the Securities Act and any profit on any 
such resale of New Notes and any commission or concessions received by any 
such persons may be deemed to be underwriting compensation under the 
Securities Act. The Letter of Transmittal states that, by acknowledging that 
it will deliver and by delivering a prospectus, a broker-dealer will not be 
deemed to admit that it is an "underwriter" within the meaning of the 
Securities Act.
 
    For a period of 180 days after the Expiration Date (or such longer period 
as required by the terms of the Registration Rights Agreement), the Issuers 
will promptly send additional copies of this Prospectus and any amendment or 
supplement to this Prospectus to any broker-dealer that requests such 
documents in the Letter of Transmittal. The Company has agreed to pay all 
expenses incidental to the Exchange Offers (including the reasonable expenses 
of one counsel for the Holders of the Notes) other than commissions or 
concessions of any brokers or dealers and will indemnify the Holders of the 
Notes (including any broker-dealers) against certain liabilities, including 
liabilities under the Securities Act.
 
    The Company has agreed to pay all expenses incident to the Exchange Offer 
other than commissions or concessions of any brokers or dealers and transfer 
taxes and costs incurred by a holder in transmitting its Old Notes to the 
Exchange Agent and will indemnify the holders of the Old Notes (including any 
broker-dealers) against certain liabilities, including liabilities under the 
Securities Act.
 
                                 LEGAL MATTERS
 
    The legality of the New Notes offered hereby and certain tax matters are 
being passed upon for the Company by Graubard Mollen & Miller, New York, New 
York. Certain partners and employees of Graubard Mollen & Miller own shares 
of the Company's Common Stock.
 
                                    EXPERTS
 
    The consolidated financial statements of the Company as of December 31, 
1995 and 1996, and for the years ended February 28, 1995, December 31, 1996 
and the ten months ended December 31, 1995 incorporated by reference into 
this Prospectus and the financial statements of Milliwave Limited Partnership 
as of December 31, 1995 and 1996 and for the period April 25, 1995 
(inception) through December 31, 1995 and for the year ended December 31, 
1996 incorporated by reference into this Prospectus have been audited by 
Grant Thornton LLP, independent certified public accountants, to the extent 
and for the periods indicated in their reports thereon.
 
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