AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 4, 2000

                                      REGISTRATION STATEMENT NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------

                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                             ---------------------

                                   VYYO INC.
             (Exact name of Registrant as specified in its charter)


                                                                              
                Delaware                                    3670                                   94-3241270
    (State or Other Jurisdiction of             (Primary Standard Industrial                    (I.R.S. Employer
     Incorporation or Organization)             Classification Code Number)                  Identification Number)


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

                   20400 Stevens Creek Boulevard, 8(th) Floor
                          Cupertino, California 95014
                                 (408) 863-2300
               (Address, Including Zip Code, and Telephone Number
       Including Area Code, of Registrant's Principal Executive Offices)
                         ------------------------------

                                  Davidi Gilo
                            Chief Executive Officer
                                   Vyyo Inc.
                   20400 Stevens Creek Boulevard, 8(th) Floor
                          Cupertino, California 95014
                                 (408) 863-2300
            (Name, Address, Including Zip Code, and Telephone Number
                   Including Area Code, of Agent for Service)
                         ------------------------------

                                   COPIES TO:


                                                                          
         Gregory C. Smith, Esq.                  Donald C. Reinke, Esq.               Nora L. Gibson, Esq.
      Keith L. Belknap, Jr., Esq.                Bruce D. Whitley, Esq.               Angela C. Hilt, Esq.
       Genae M. Richardson, Esq.                Gizelle A. Barany, Esq.              Jeanine M. Larrea, Esq.
Skadden, Arps, Slate, Meagher & Flom LLP        Bay Venture Counsel, LLP             Shelly E. Wharton, Esq.
    525 University Avenue, Suite 220        1999 Harrison Street, Suite 1300    Brobeck, Phleger & Harrison, LLP
      Palo Alto, California 94301              Oakland, California 94612         One Market, Spear Street Tower,
             (650) 470-4500                          (510) 273-8750              San Francisco, California 94105
                                                                                         (415) 442-0900


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

    Approximate date of commencement of proposed sale to the public: As soon as
practicable after the effective date of this Registration Statement.

    If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 of the Securities Act of
1933, check the following box. / /

    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. / /

    If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

    If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /

                        CALCULATION OF REGISTRATION FEE



                                                               PROPOSED MAXIMUM
                   TITLE OF EACH CLASS OF                     AGGREGATE OFFERING        AMOUNT OF
                SECURITIES TO BE REGISTERED                        PRICE(1)         REGISTRATION FEE
                                                                             
Common stock, par value $0.0001 per share...................     $115,000,000            $30,360


(1) Estimated solely for purposes of calculating the registration fee pursuant
    to Rule 457(o).
                           --------------------------

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

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

The information in this prospectus is not complete and may be changed without
notice. We may not sell these securities until the registration statement filed
with the Securities and Exchange Commission is effective. This prospectus is not
an offer to sell these securities and we are not soliciting offers to buy these
securities in any state where the offer or sale is not permitted.

Prospectus (not complete)

Issued February 4, 2000

                                            SHARES

                                     [LOGO]

                                  COMMON STOCK

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

    Vyyo Inc. is offering shares of its common stock in an initial public
offering. No public market currently exists for our common stock. We anticipate
that the initial public offering price for our common stock will be between $
and $  per share.

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

    We have applied to have our common stock approved for quotation on the
Nasdaq National Market under the symbol "VYYO."

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

    INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. SEE "RISK
FACTORS" BEGINNING ON PAGE 4.

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



                                                    Per Share               Total
                                                    ---------               -----
                                                                   
Offering Price....................................   $                   $
Discounts and Commissions to Underwriters.........   $                   $
Offering Proceeds to Vyyo Inc.....................   $                   $


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

    Vyyo Inc. has granted the underwriters the right to purchase up to an
additional       shares of common stock to cover any over-allotments. The
underwriters can exercise this right at any time within 30 days after the
offering. Banc of America Securities LLC expects to deliver the shares of common
stock to investors on              , 2000.

Banc of America Securities LLC
                               CIBC World Markets
                                                           Dain Rauscher Wessels
                                ----------------

               The date of this prospectus is             , 2000

[The graphic is a base station connected to an antenna that transmits to a modem
located in residences and businesses.]

    - Point-to-multipoint wireless hubs are located in base stations and send
      and receive data traffic to and from up to 8,000 wireless subscriber
      modems at very high speeds.

    - Network management system software manages the traffic transmitted over
      our broadband wireless system.

    - Wireless modems connected to PCs or LANs are located in residences,
      small/home offices and medium-sized businesses and send and receive data
      traffic and provide access to the Internet.

    - Our wireless hub interfaces with a router located in the base station that
      sends data traffic to the Internet and, in the future, voice traffic to
      the gateway which connects with the public telephone network.

    - System integrators or service providers combine our systems with
      additional network equipment, such as an antenna to transmit wireless
      radio frequency signals, and complete the network infrastructure.

    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. WE
HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION DIFFERENT FROM THAT
CONTAINED IN THIS PROSPECTUS. WE ARE OFFERING TO SELL, AND SEEKING OFFERS TO
BUY, SHARES OF COMMON STOCK ONLY IN JURISDICTION WHERE OFFERS AND SALES ARE
PERMITTED. THE INFORMATION CONTAINED IN THIS PROSPECTUS IS ACCURATE ONLY AS OF
THE DATE OF THIS PROSPECTUS, REGARDLESS OF THE TIME OF DELIVERY OF THIS
PROSPECTUS OR OF ANY SALE OF OUR COMMON STOCK.

                               TABLE OF CONTENTS



                                                                PAGE
                                                              --------
                                                           
Prospectus Summary..........................................       1
Risk Factors................................................       4
Cautionary Note on Forward-Looking Statements...............      17
Use of Proceeds.............................................      18
Dividend Policy.............................................      18
Capitalization..............................................      19
Dilution....................................................      20
Selected Consolidated Financial Data........................      21
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................      22
Business....................................................      28
Management..................................................      40
Certain Relationships and Related Transactions..............      52
Principal Stockholders......................................      58
Description of Capital Stock................................      60
Shares Eligible for Future Sale.............................      62
Underwriting................................................      64
Legal Matters...............................................      67
Experts.....................................................      67
Available Information.......................................      67
Index to Financial Statements...............................     F-1


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

    Our principal executive offices are located at 20400 Stevens Creek
Boulevard, 8(th) Floor, Cupertino, California 95014, and our telephone number is
(408) 863-2300. Our World Wide Web site address is www.vyyo.com. The information
on our Web site does not constitute part of this prospectus.

    In this prospectus, the terms "Vyyo Inc.," "Vyyo," "we," "us," and "our"
refer to Vyyo Inc. and its subsidiary, unless the context otherwise requires,
and "common stock" refers to our common stock, $0.0001 par value per share. See
"Description of Capital Stock."

    We have applied for federal registration of our trademarks DOCSIS(+) and
LMDS Lite. Other service marks, trademarks and trade names referred to in this
prospectus are the property of their respective owners.

                               PROSPECTUS SUMMARY

    THIS SUMMARY HIGHLIGHTS INFORMATION CONTAINED ELSEWHERE IN THIS PROSPECTUS.
THIS SUMMARY IS NOT COMPLETE AND DOES NOT CONTAIN ALL THE INFORMATION YOU SHOULD
CONSIDER BEFORE BUYING SHARES IN THE OFFERING. YOU SHOULD READ THE ENTIRE
PROSPECTUS CAREFULLY, INCLUDING THE RISK FACTORS AND CONSOLIDATED FINANCIAL
STATEMENTS AND RELATED NOTES APPEARING ELSEWHERE IN THIS PROSPECTUS. THIS
PROSPECTUS CONTAINS FORWARD-LOOKING STATEMENTS, WHICH INVOLVE RISKS AND
UNCERTAINTIES. VYYO'S ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE
ANTICIPATED IN THESE FORWARD-LOOKING STATEMENTS AS A RESULT OF THE FACTORS
DESCRIBED UNDER "RISK FACTORS" AND ELSEWHERE IN THIS PROSPECTUS. SEE "CAUTIONARY
NOTE ON FORWARD-LOOKING STATEMENTS."

                                      VYYO

    We are a leading global provider of broadband wireless access systems used
by telecommunications service providers to deliver wireless, high-speed data
connections to business and residential subscribers. Our systems have a
point-to-multipoint architecture based on the Internet protocol, or IP, which is
the networking standard used to deliver voice and data over the Internet. Our
system is designed to allow service providers to rapidly and cost-effectively
bridge the segment of the network which connects the service providers' systems
directly to the subscribers, commonly referred to as the last mile. Early
customer acceptance of our systems has resulted in commercial deployment at 21
domestic and international sites.

    Internet and data network traffic growth has created demand for
cost-effective, high-speed communications, as subscribers increasingly rely on
content-rich applications and remote access to data networks. In the United
States and abroad, the communications industry is in varying stages of
deregulation, which has created the opportunity for new competitors to offer
multiple communications services directly to subscribers. There are a number of
wire-based technologies that deliver high-speed connections, but performance,
cost, time for deployment or service availability limit the use of these
alternative technologies to satisfy the needs of service providers and
subscribers. High-speed, wireless point-to-multipoint technology provides a
broadband solution to service providers, with numerous advantages over
alternative broadband technologies, including the ability to rapidly and
cost-effectively expand their current market coverage or to enter new markets
while avoiding the limitations of the existing wire-based infrastructure.

    Our system is deployed in point-to-multipoint applications, at radio
frequencies commonly referred to as LMDS and MMDS, for two-way broadband
communication. Our system, which is based on the cable industry's DOCSIS
standard, consists of a wireless hub, located at a base station, and a
subscriber wireless modem. Each hub transmits, receives and manages network
traffic to and from our wireless modems, which are installed at multiple
subscriber locations. We sell our systems directly to service providers and
system integrators that deploy our systems as part of their end-to-end network
solutions.

    Our objective is to be the leading worldwide supplier to service providers
and system integrators of broadband wireless access systems deployed in
point-to-multipoint applications. As key elements of our strategy, we intend to:

    - capitalize on early acceptance of our systems;

    - broaden our product offerings;

    - improve cost-effectiveness and performance of our systems;

    - leverage key strategic relationships; and

    - participate in developing industry standards.

    We were incorporated in 1996 in Delaware under the name PhaseCom, Inc. In
January 2000, we changed our name to Vyyo Inc. Our principal executive offices
are located at 20400 Stevens Creek Boulevard, 8th Floor, Cupertino, California
95014, and our telephone number is (408) 863-2300.

                                       1

                                  THE OFFERING


                                            

Common stock offered by Vyyo.................  shares

Common stock to be outstanding after this
  offering...................................  shares

Use of proceeds..............................  We expect to use the net proceeds of this
                                               offering for working capital and other
                                               general corporate purposes. We may use a
                                               portion of the net proceeds to acquire
                                               complementary products, technologies or
                                               businesses.

Proposed Nasdaq National Market symbol.......  VYYO

Dividend policy..............................  We intend to retain any future earnings to
                                               fund the development and expansion of our
                                               business. Therefore, we do not anticipate
                                               paying cash dividends on our common stock in
                                               the foreseeable future.

Risk factors.................................  This offering involves a high degree of risk.
                                               See "Risk Factors" beginning on page 4 for a
                                               discussion of factors you should consider
                                               before deciding to invest in shares of our
                                               common stock.


    The common stock to be outstanding after this offering is based on shares
outstanding as of December 31, 1999. The common stock outstanding excludes:

    - 2,449,425 shares of common stock issuable as of December 31, 1999 upon the
      exercise of outstanding stock options issued under our option plans at a
      weighted average exercise price of $1.03 per share;

    - 3,512,000 shares of common stock initially reserved for issuance under our
      stock option plans;

    - 500,000 shares of common stock initially reserved for issuance under our
      employee stock purchase plan; and

    - 125,190 shares of common stock issuable as of December 31, 1999 upon the
      exercise of outstanding warrants with a weighted average exercise price of
      $1.89 per share.

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

    EXCEPT AS OTHERWISE INDICATED, INFORMATION IN THIS PROSPECTUS ASSUMES THE
FOLLOWING:

    - THE AMENDMENT AND RESTATEMENT OF OUR CERTIFICATE OF INCORPORATION;

    - THE CONVERSION OF ALL OUTSTANDING SHARES OF PREFERRED STOCK INTO 2,629,702
      SHARES OF COMMON STOCK;

    - THE 1-FOR-5 REVERSE STOCK SPLIT EFFECTED ON JANUARY 3, 2000; AND

    - NO EXERCISE OF THE UNDERWRITERS' OVER-ALLOTMENT OPTION.

                                       2

                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)



                                                                 YEAR ENDED DECEMBER 31,
                                                              ------------------------------
                                                                1997       1998       1999
                                                              --------   --------   --------
                                                                           
STATEMENT OF OPERATIONS DATA:
Net revenues................................................  $ 1,537    $ 2,449    $  4,230
Cost of revenues............................................    1,556      2,568       4,316
                                                              -------    -------    --------
Gross loss..................................................      (19)      (119)        (86)
Operating expenses:
  Research and development..................................    2,398      3,252       3,678
  Sales and marketing.......................................    1,484      2,413       1,972
  General and administrative................................    1,200      1,363       2,148
  Amortization of deferred stock compensation...............       --         --       3,600
                                                              -------    -------    --------
Total operating expenses....................................    5,082      7,028      11,398
                                                              -------    -------    --------
Operating loss..............................................   (5,101)    (7,147)    (11,484)
  Interest and other income (expense), net..................     (244)      (524)       (717)
                                                              -------    -------    --------
Net loss....................................................  $(5,345)   $(7,671)   $(12,201)
                                                              =======    =======    ========
Net loss per share:
  Basic and diluted.........................................  $ (8.86)   $ (8.15)   $  (2.27)
                                                              =======    =======    ========
  Pro forma basic and diluted (unaudited)...................                        $  (1.81)
                                                                                    ========
Shares used in per share computations:
  Basic and diluted.........................................      603        941       5,385
                                                              =======    =======    ========
  Pro forma basic and diluted (unaudited)...................                           6,758
                                                                                    ========




                                                                DECEMBER 31, 1999
                                                              ----------------------
                                                                          PRO FORMA
                                                               ACTUAL    AS ADJUSTED
                                                              --------   -----------
                                                                   
BALANCE SHEET DATA:
Cash and cash equivalents...................................   $5,036
Working capital.............................................      210
Total assets................................................    8,161
Long-term obligations, net of current portion...............       --
Total stockholders' equity..................................    1,305


    This balance sheet data is presented on a pro forma as adjusted basis to
give effect to:

    - the conversion of all outstanding shares of preferred stock into shares of
      common stock upon the closing of this offering; and

    - the sale of the shares of common stock in this offering at the assumed
      initial public offering price of $  per share after deducting the
      underwriting discounts and commissions and estimated offering expenses.

                                       3

                                  RISK FACTORS

    ANY INVESTMENT IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. YOU
SHOULD CAREFULLY CONSIDER THE FOLLOWING RISKS BEFORE MAKING AN INVESTMENT
DECISION. THE TRADING PRICE OF OUR COMMON STOCK COULD DECLINE DUE TO ANY OF
THESE RISKS, AND YOU COULD LOSE ALL OR PART OF YOUR INVESTMENT. YOU ALSO SHOULD
CONSIDER CAREFULLY THE OTHER INFORMATION CONTAINED IN THIS PROSPECTUS, INCLUDING
OUR CONSOLIDATED FINANCIAL STATEMENTS AND RELATED NOTES BEFORE DECIDING TO
PURCHASE SHARES OF OUR COMMON STOCK.

                         RISKS RELATED TO OUR BUSINESS

WE HAVE A LIMITED OPERATING HISTORY IN THE BROADBAND POINT-TO-MULTIPOINT
WIRELESS ACCESS MARKET, WHICH MAY LIMIT YOUR ABILITY TO EVALUATE OUR BUSINESS
AND YOUR INVESTMENT.

    The broadband wireless access market is only beginning to emerge. We began
commercial shipments of our broadband point-to-multipoint wireless access
systems in the first quarter of 1999. Product revenues recognized in 1999 relate
to sales of both cable and wireless modem products. All of our product revenues
in 1998 and 1997 relate to sales of cable modem products that we are no longer
developing. Therefore, the success of our business will be entirely dependent
upon the success of our wireless products. We have a very limited operating
history in the broadband point-to-multipoint wireless access market upon which
to evaluate our future prospects, and the revenue and income potential of our
business and market are unproven. Our limited operating history in this market
may limit your ability to evaluate our prospects due to:

    - our limited historical financial data from our wireless products;

    - our unproven potential to generate profits; and

    - our limited experience in addressing emerging trends that may affect our
      business.

    As a young company, we face risks and uncertainties relating to our ability
to implement our business plan successfully. You should consider our prospects
in light of the risks, expenses and difficulties we may encounter.

WE HAVE A HISTORY OF LOSSES, EXPECT FUTURE LOSSES AND MAY NEVER ACHIEVE OR
SUSTAIN PROFITABILITY.

    We have incurred significant losses since our inception, and we expect to
continue to incur net losses for the foreseeable future. We incurred net losses
of approximately $12.2 million in 1999. As of December 31, 1999, our accumulated
deficit was approximately $34.8 million. We intend to significantly increase our
operating expenses, especially our marketing and selling expenses, and our
research and development expenses related to the LMDS and MMDS markets. However,
our revenues may not grow or even continue at their current level. If our
revenues do not rapidly increase or if our expenses increase at a greater pace
than our revenues, we will never become profitable.

OUR QUARTERLY OPERATING RESULTS FLUCTUATE, WHICH MAY CAUSE OUR SHARE PRICE TO
DECLINE.

    Our quarterly operating results have varied significantly in the past and
are likely to vary significantly in the future. These variations result from a
number of factors, many of which are substantially outside of our control,
including:

    - the uncertain timing and level of market acceptance for our systems;

    - the effectiveness of our system integrator customers in marketing and
      selling their network systems equipment;

    - reductions in pricing by us or our competitors;

    - the mix of systems sold by us and the mix of sales channels through which
      they are sold; and

                                       4

    - changes in the prices of the components we purchase or license.

    Our operating results will also fluctuate based upon our ability to obtain
new and retain existing customers that adopt and implement our systems. More
specifically, our results will vary based upon:

    - the size, timing and shipment of orders for our systems, especially large
      orders from some of our customers;

    - our customers' ability to forecast their needs and manage their inventory
      positions accurately; and

    - delays in delivery by the subcontractors, many of whom are overseas, that
      manufacture our system components.

In addition, a delay in the recognition of revenue, even from one customer, may
have a significant negative impact on our results of operations for a given
period. We have experienced such delays in the past, and our results of
operations for those periods were negatively impacted. Also, because only a
small portion of our expenses vary with our revenues, if revenue levels for a
quarter fall below our expectations, we will not be able to timely adjust
expenses accordingly, which would harm our operating results in that period.

    Because of the variations which we have experienced in our quarterly
operating results, we do not believe that period-to-period comparisons of our
results of operations are meaningful or should be relied upon as indicators of
future performance. In addition, our operating results may be below the
expectations of securities analysts and investors in future periods. Our failure
to meet these expectations will likely cause our share price to decline.

IF BROADBAND WIRELESS TECHNOLOGY OR OUR IMPLEMENTATION OF THIS TECHNOLOGY IS NOT
BROADLY ACCEPTED, WE WILL NOT BE ABLE TO SUSTAIN OR EXPAND OUR BUSINESS.

    Our future success depends on high-speed wireless communications products
gaining market acceptance as a means to provide voice and data communications
services. Because these markets are relatively new, it is difficult to predict
which market segments will develop or expand. We have recently invested and
expect to continue to invest significant time and resources in the development
of new products for this market. In the event that service providers adopt
technologies other than the high-speed access and other wireless technologies
that we offer, we will not be able to sustain or expand our business.

    Service providers continually evaluate alternative technologies, including
digital subscriber line, fiber, cable, satellite and point-to-point wireless.
The failure of service providers to accept our products would seriously harm our
business.

WE DEPEND ON ONE SYSTEM INTEGRATOR FOR A SIGNIFICANT PORTION OF OUR REVENUES AND
IF THIS SYSTEM INTEGRATOR DOES NOT PROMOTE OR PURCHASE OUR PRODUCTS, OUR
BUSINESS WILL BE SERIOUSLY HARMED.

    We sell a significant portion of our products to ADC Telecommunications. The
loss of ADC Telecommunications as a customer, or the delay of significant orders
from it, even if only temporary, could, among other things:

    - reduce or delay our revenues;

    - harm our reputation with major service providers, particularly if ADC
      Telecommunications were to replace our products with a competitor's
      products; or

    - reduce our ability to predict our cash flow accurately.

                                       5

    Sales through ADC Telecommunications accounted for approximately 20% of our
net revenues for 1999 and approximately 31% of our net revenues for 1998. There
are a limited number of system integrators that have the financial resources or
technical expertise to sell or integrate our systems globally. If ADC
Telecommunications will not sell, service or integrate our products, and we
cannot secure other system integrators as replacements, we would be limited in
our ability to sell our products. ADC Telecommunications has the right to
distribute our systems exclusively in the United States for use in the MMDS
frequency band. Should ADC Telecommunications cease to emphasize systems that
include our products, choose to emphasize alternative technologies or promote
systems of our competitors, our business would be seriously harmed.

THE LOSS OF ONE OR MORE OF OUR KEY CUSTOMERS WOULD RESULT IN A LOSS OF A
SIGNIFICANT AMOUNT OF OUR REVENUES.

    A relatively small number of customers account for a large percentage of our
revenues. In 1999, ADC Telecommunications accounted for approximately 20% of our
revenues, Aster City Cable accounted for approximately 14% of our revenues,
Shanghai Bell accounted for approximately 13% of our revenues and Philips
Semiconductor accounted for approximately 12% of our revenues. Revenues
attributable to Aster City Cable and Shanghai Bell relate to sales of cable
modem products that we are no longer developing. Accordingly, we do not
anticipate recognizing material amounts of revenue from these products in the
future. Revenues attributable to Philips Semiconductor relate to a joint
technology development arrangement that we expect to complete in 2000 and no
similar arrangements are contemplated.

    We expect that we will continue to depend on a relatively limited number of
customers for a substantial portion of our revenues in future periods. The loss
of a major customer or the reduction, delay or cancellation of orders from one
or more of our significant customers could seriously harm our ability to sustain
revenue levels, which would seriously harm our operating results.

COMPETITION MAY DECREASE OUR MARKET SHARE, NET REVENUES AND GROSS MARGINS, WHICH
MAY CAUSE OUR STOCK PRICE TO DECLINE.

    The market for broadband access systems is intensely competitive, rapidly
evolving and subject to rapid technological change. The principal competitive
factors in this market include:

    - product performance and features;

    - price of competitive products;

    - reliability and stability of operation;

    - ability to develop and implement new services and technologies;

    - ability to support newly allocated frequencies; and

    - sales capability, technical support and service.

    Many of our competitors and potential competitors have substantially greater
financial, technical, distribution, marketing and other resources than we have
and, therefore, may be able to respond more quickly to new or changing
opportunities, technologies and other developments. In addition, many of our
competitors have longer operating histories, greater name recognition and
established relationships with system integrators and service providers. These
competitors may also be able to undertake more extensive marketing campaigns,
adopt more aggressive pricing policies and devote substantially more resources
to developing new products. Our primary competitor is Hybrid Networks, Inc. In
addition, well-capitalized companies such as Cisco Systems, Lucent Technologies,
Nortel Networks, Newbridge Networks and other vendors have announced plans to
enter, or are potential entrants into, the broadband wireless market. These
vendors have been attracted by recent investments by MCI

                                       6

WorldCom, Sprint and other service providers in wireless operations. Most of
these competitors have existing relationships with one or more of our
prospective customers.

    We also face competition from technologies such as digital subscriber line,
fiber, cable, satellite and point-to-point wireless. We may not be able to
compete successfully against our current and future competitors and competitive
pressures may seriously harm our business.

IF WE DO NOT DEVELOP NEW SYSTEMS AND SYSTEM FEATURES IN RESPONSE TO CUSTOMER
REQUIREMENTS OR IN A TIMELY WAY, CUSTOMERS MAY NOT BUY OUR PRODUCTS, WHICH WOULD
SERIOUSLY HARM OUR BUSINESS.

    The broadband wireless access industry is rapidly evolving and subject to
technological change and innovation. We may experience design or manufacturing
difficulties that could delay or prevent our development, introduction or
marketing of new systems and enhancements, any of which could cause us to incur
unexpected expenses or lose revenues. If we are unable to comply with diverse,
new or varying governmental regulations or industry standards in each of the
many worldwide markets in which we compete, we may not be able to respond to
customers in a timely manner, which would harm our business.

WE DEPEND ON CONTRACT MANUFACTURERS AND THESE MANUFACTURERS MAY BE UNABLE TO
FILL OUR ORDERS ON A TIMELY BASIS.

    We currently have relationships with three contract manufacturers for the
manufacturing of our systems, two of which are located in Israel and one of
which is located in Taiwan. These relationships may be terminated by either
party with little or no notice. If our manufacturers are unable or unwilling to
continue manufacturing our systems in required volumes, we would have to
identify qualified alternative manufacturers, which would result in delays that
could cause our results of operations to suffer. Our limited experience with
these manufacturers does not provide us with a reliable basis on which to
project their ability to meet delivery schedules, yield targets or costs. If we
are required to find alternative manufacturing sources, we may not be able to
satisfy our production requirements at acceptable prices and on a timely basis,
if at all. Any significant interruption in supply would affect the allocation of
systems to customers, which in turn could seriously harm our business.

WE OBTAIN SOME OF THE COMPONENTS INCLUDED IN OUR SYSTEMS FROM A SINGLE SOURCE OR
A LIMITED GROUP OF SUPPLIERS, AND THE LOSS OF ANY OF THESE SUPPLIERS COULD CAUSE
PRODUCTION DELAYS AND A SUBSTANTIAL LOSS OF REVENUE.

    We currently obtain key components from a limited number of suppliers. Some
of these components, such as semiconductor components for our hubs, are obtained
from a single source supplier. We generally do not have long-term supply
contracts with our suppliers. These factors present us with the following risks:

    - delays in delivery or shortages in components could interrupt and delay
      manufacturing and result in cancellation of orders for our systems;

    - suppliers could increase component prices significantly and with immediate
      effect;

    - we may not be able to develop alternative sources for system components,
      if or as required in the future;

    - suppliers could discontinue the manufacture or supply of components used
      in our systems. In such event, we might need to modify our systems, which
      may cause delays in shipments, increased manufacturing costs and increased
      systems prices; and

    - we may hold more inventory than is immediately required to compensate for
      potential component shortages or discontinuation.

                                       7

    The occurrence of any of these or similar events would harm our business.

WE MAY EXPERIENCE DELAYS IN THE DELIVERY OF COMPONENTS FROM OUR SUPPLIERS.

    Delays and shortages in the supply of components are typical in our
industry. We have experienced minor delays and shortages on more than one
occasion in the past. In addition, any failure of necessary worldwide
manufacturing capacity to rise along with a rise in demand could result in our
subcontract manufacturers allocating available capacity to larger customers or
to customers that have long-term supply contracts in place. Our inability to
obtain adequate manufacturing capacity at acceptable prices, or any delay or
interruption in supply, could reduce our revenues or increase our cost of
revenue and could seriously harm our business.

COMPETITION MAY RESULT IN LOWER AVERAGE SELLING PRICES AND WE MAY BE UNABLE TO
REDUCE OUR COSTS AT OFFSETTING RATES, WHICH MAY IMPAIR OUR ABILITY TO ACHIEVE OR
MAINTAIN PROFITABILITY.

    We expect that price competition among broadband wireless access systems
suppliers will reduce our gross margins in the future. We anticipate that the
average selling prices of broadband wireless access systems will continue to
decline as product technologies mature. Since we do not manufacture our own
systems, we may be unable to reduce our manufacturing costs in response to
declining average per unit selling prices. Our competitors may be able to
achieve greater economies of scale and may be less vulnerable to the effects of
price competition than we are. These declines in average selling prices will
generally lead to declines in gross margins and total profitability for these
systems. If we are unable to reduce our costs to offset declines in average
selling prices, we may not be able to achieve or maintain profitability.

IF WE DO NOT EFFECTIVELY MANAGE OUR EXPANSION, OUR REVENUES MAY NOT INCREASE,
OUR COSTS MAY INCREASE AND OUR BUSINESS COULD BE SERIOUSLY HARMED.

    We are continuing to actively expand our operations. This growth has placed,
and will continue to place, a significant strain on our managerial, operational
and financial resources. We also need to implement sophisticated inventory and
control systems.

    To manage growth effectively, we must, among other things:

    - improve and expand our information and financial systems, and managerial
      procedures and controls;

    - hire, train, manage and retain qualified employees; and

    - effectively manage relationships with our customers, suppliers and other
      third parties.

    We may not have made adequate allowances for the costs and risks associated
with this expansion, our systems, procedures or controls may not be adequate to
support our operations, and our management may be unable to offer and expand our
product categories successfully. Any delay in implementing, or transitioning to,
new or enhanced systems, procedures or controls may seriously harm our ability
to record and report financial and management information on a timely and
accurate basis or otherwise manage our expanding operations. If we are unable to
do so effectively, our business may be seriously harmed.

BECAUSE WE OPERATE IN INTERNATIONAL MARKETS, WE ARE EXPOSED TO ADDITIONAL RISKS
WHICH COULD CAUSE OUR INTERNATIONAL SALES TO DECLINE AND OUR FOREIGN OPERATIONS
TO SUFFER.

    Sales outside of North America accounted for approximately 39% of our
revenues in 1999 and 55% of our revenues in 1998. We expect that international
sales will continue to account for a significant portion of our revenues. In
addition, we maintain research and development facilities in

                                       8

Israel. Our reliance on international sales and operations exposes us to foreign
political and economic risks, which may impair our ability to generate revenues.
These risks include:

    - economic and political instability;

    - changes in regulatory requirements and licensing frequencies to service
      providers;

    - import or export licensing requirements and tariffs;

    - trade restrictions; and

    - more limited protection of intellectual property rights.

    Any of the foregoing difficulties of conducting business internationally
could seriously harm our business.

BECAUSE WE DO NOT HAVE LONG-TERM CONTRACTS WITH OUR CUSTOMERS, OUR CUSTOMERS CAN
DISCONTINUE PURCHASES OF OUR SYSTEMS AT ANY TIME.

    We sell our systems based on individual purchase orders. Our customers are
generally not obligated by long-term contracts to purchase our systems. Our
customers can generally cancel or reschedule orders on short notice and can
discontinue using our systems at any time. Further, having a successful system
trial does not necessarily mean that the customer will order large volumes of
our systems. The inability to retain our customers and increase their orders
would seriously harm our business.

OUR SUCCESS DEPENDS IN PART ON THE ABILITY OF OUR SENIOR MANAGEMENT TEAM TO WORK
TOGETHER EFFECTIVELY.

    Several of our existing senior management personnel, including Michael
Corwin, our Chief Operating Officer, Eran Pilovsky, our Chief Financial Officer,
and Arnon Kohavi, our Senior Vice President of Strategic Relations, joined us in
the last six months. As a result, our senior management team has had a limited
time to work together. If they are unable to work together effectively to manage
our organization as a public company, our business may be seriously harmed.

THIRD PARTIES MAY BRING INFRINGEMENT CLAIMS AGAINST US WHICH COULD BE
TIME-CONSUMING AND EXPENSIVE TO DEFEND.

    Companies serving the telecommunications market have historically defended
their intellectual property rights vigorously. We expect that as the number of
products and competitors in our industry segment increases, developers of
wireless equipment will be increasingly subject to infringement claims. If we
were determined to be infringing upon the proprietary rights of any third party,
we could be required to pay damages, alter our products or processes, obtain
licenses or cease certain activities. Licenses required under proprietary rights
held by third parties may not be made available on terms acceptable to us, or at
all. To the extent that we are unable to obtain such licenses, we could
encounter delays in product shipment while attempting to design around such
proprietary rights or be foreclosed from the development, manufacture or
commercialization of the product requiring such license, which could seriously
harm our business.

    From time to time, third parties, including our competitors, may assert
patent, copyright and other intellectual property rights to technologies that
are important to us. We expect that we will increasingly be subject to license
offers and infringement claims as the number of products and competitors in our
market grows and the functionality of products overlaps. In this regard, in
early 1999, we received a written notice from Hybrid Networks in which Hybrid
claimed to have patent rights in certain technology. Hybrid requested that we
review our products in light of six of Hybrid's issued patents.

                                       9

    We are investigating Hybrid's claims and we currently believe the patents
are invalid or are not infringed by our products. However, others patents,
including Hybrid's, may be determined to be valid, or some or all of our
products may ultimately be determined to infringe the Hybrid patents or those of
other companies. Hybrid or other companies may pursue litigation with respect to
these or other claims. The results of any litigation are inherently uncertain.
In the event of an adverse result in any litigation with respect to intellectual
property rights relevant to our products that could arise in the future, we
could be required to obtain licenses to the infringing technology, pay
substantial damages under applicable law, to cease the manufacture, use and sale
of infringing products or to expend significant resources to develop
non-infringing technology. Licenses may not be available from third parties,
including Hybrid, either on commercially reasonable terms or at all. In
addition, litigation frequently involves substantial expenditures and can
require significant management attention, even if we ultimately prevail.
Accordingly, any infringement claim or litigation against us could significantly
harm our business, operating results and financial condition.

IF WE FAIL TO ADEQUATELY PROTECT OUR INTELLECTUAL PROPERTY, WE MAY NOT BE ABLE
TO COMPETE.

    Our success depends in part on our ability to protect our proprietary
technologies. We rely on a combination of patent, copyright and trademark laws,
trade secrets and confidentiality and other contractual provisions to establish
and protect our proprietary rights. We have 16 patent applications pending in
the United States.

    Our pending or future patent applications may not be approved and the claims
covered by such applications may be reduced. If allowed, our patents may not be
of sufficient scope or strength, others may independently develop similar
technologies or products, duplicate any of our products or design around our
patents, and the patents may not provide us competitive advantages. Further,
patents held by third parties may not prevent the commercialization of products
incorporating our technologies or third parties may challenge or seek to narrow,
invalidate or circumvent any of our pending or future patents. We also believe
that foreign patents, if obtained, and the protection afforded by such foreign
patents and foreign intellectual property laws, may be more limited than that
provided under United States patents and intellectual property laws. Litigation,
which could result in substantial costs and diversion of effort by us, may also
be necessary to enforce any patents issued or licensed to us or to determine the
scope and validity of third-party proprietary rights. Any such litigation,
regardless of outcome, could be expensive and time consuming, and adverse
determinations in any such litigation could seriously harm our business.

    We also rely on unpatented trade secrets and know-how and proprietary
technological innovation and expertise which are protected in part by
confidentiality and invention assignment agreements with our employees, advisors
and consultants. These agreements may be breached, we may not have adequate
remedies for any breach, or our unpatented proprietary intellectual property may
otherwise become known or independently discovered by competitors.

UNDETECTED HARDWARE DEFECTS OR SOFTWARE ERRORS MAY INCREASE OUR COSTS AND IMPAIR
THE MARKET ACCEPTANCE OF OUR SYSTEMS.

    Our systems may contain undetected defects or errors. This may result either
from defects in components supplied by third parties or from errors in our
software that we have failed to detect. These defects or errors are likely to be
found from time to time in new or enhanced products and systems after
commencement of commercial shipments. Our customers integrate our systems into
their networks with components from other vendors. Accordingly, when problems
occur in a network system it may be difficult to identify the component that
caused the problem. Regardless of the source of these defects or errors, we will
need to divert the attention of our engineering personnel from our product
development efforts to address the defect or error. We may incur significant
warranty and repair costs related to defects or errors, and we may also be
subject to liability claims for damages related to these

                                       10

defects or errors. The occurrence of defects or errors, whether caused by our
systems or the components of another vendor, may result in significant customer
relations problems and injury to our reputation and may impair the market
acceptance of our systems.

BECAUSE OF OUR LONG PRODUCT DEVELOPMENT PROCESS AND SALES CYCLE, WE MAY INCUR
SUBSTANTIAL EXPENSES WITHOUT ANTICIPATED REVENUES WHICH COULD CAUSE OUR
OPERATING RESULTS TO FLUCTUATE.

    A customer's decision to purchase many of our systems typically involves a
significant technical evaluation, formal internal procedures associated with
capital expenditure approvals and testing and acceptance of new systems that
affect key operations. For these and other reasons, the sales cycle associated
with our systems can be lengthy and subject to a number of significant risks
over which we have little or no control. Our next generation systems are
expected to have even longer sales cycles and involve demonstrations, field
trials and other evaluation periods, which will further lengthen the sales
cycle. Because of the growing sales cycle and the possibility that we may rely
on a concentrated number of customers for our revenues, our operating results
could be seriously harmed if such revenues do not materialize when anticipated,
or at all.

OUR SUCCESS DEPENDS UPON OUR ABILITY TO ATTRACT, TRAIN AND RETAIN QUALIFIED
ENGINEERS, MARKETING, SALES AND TECHNICAL SUPPORT PERSONNEL

    We will need to hire additional engineers and highly trained technical
support personnel in Israel and in Northern California in order to succeed. We
will need to increase our technical staff to support new customers and the
expanding needs of existing customers, as well as our continued research and
development operations.

    Hiring engineers, marketing, sales and technical support personnel is very
competitive in our industry, due to the limited number of people available with
the necessary skills and understanding of our products. This is particularly
true in Israel and Northern California, where competition for such personnel is
intense.

    Our systems require a sophisticated marketing and sales effort targeted at
several levels within a prospective customer's organization. We have recently
expanded our sales force and we plan to hire additional sales personnel,
particularly in the United States. Competition for qualified sales personnel is
intense, and we may not be able to hire sufficient sales personnel to support
our marketing efforts. If we are unable to hire and retain necessary personnel
in each of these rapidly expanding areas, our business will not develop, and our
operating results will be harmed.

IF WE CHOOSE TO ACQUIRE NEW AND COMPLEMENTARY BUSINESSES, PRODUCTS OR
TECHNOLOGIES, WE MAY NOT BE ABLE TO SUCCESSFULLY INTEGRATE AN ACQUIRED BUSINESS
IN A COST-EFFECTIVE AND NON-DISRUPTIVE MANNER AND REALIZE ANTICIPATED BENEFITS.

    We may make investments in complementary companies, products or
technologies. If we acquire a company, we may have difficulty integrating that
company's personnel, operations, products and technologies. These difficulties
may disrupt our ongoing business, distract our management and employees and
increase our expenses. Moreover, the anticipated benefits of any acquisition may
not be realized. Future acquisitions could result in dilutive issuances of
equity securities, the incurrence of debt, contingent liabilities or
amortization expenses related to goodwill and other intangible assets and the
incurrence of large and immediate write-offs, any of which could seriously harm
our business.

                                       11

WE ARE DEPENDENT ON THE RAPIDLY EVOLVING COMMUNICATIONS AND INTERNET INDUSTRIES.

    Our future success is dependent upon the continued growth of the
communications industry and, in particular, the Internet. The global
communications and Internet industries are evolving rapidly, and it is difficult
to predict growth rates or future trends in technology development. In addition,
the deregulation, privatization and economic globalization of the worldwide
communications market, that have resulted in increased competition and
escalating demand for new technologies and services, may not continue in a
manner favorable to us or our business strategies. In addition, the growth in
demand for Internet services and the resulting need for high-speed or enhanced
communications products may not continue at its current rate or at all.

WE ARE DEPENDENT ON OUR KEY PERSONNEL, IN PARTICULAR DAVIDI GILO, OUR CHAIRMAN
AND CHIEF EXECUTIVE OFFICER, AND MENASHE SHAHAR, OUR CHIEF TECHNICAL OFFICER,
THE LOSS OF ANY OF WHOM COULD SERIOUSLY HARM OUR BUSINESS.

    Our future success depends in large part on the continued services of our
senior management and key personnel. In particular, we are highly dependent on
the service of Davidi Gilo, our Chairman and Chief Executive Officer, and
Menashe Shahar, our Chief Technical Officer. We do not carry key person life
insurance on our senior management or key personnel. Any loss of the services of
Davidi Gilo, Menashe Shahar, other members of senior management or other key
personnel could seriously harm our business.

WE WILL NEED TO RAISE ADDITIONAL CAPITAL IN THE FUTURE, AND IF WE ARE UNABLE TO
SECURE ADEQUATE FUNDS ON TERMS ACCEPTABLE TO US, WE MAY BE UNABLE TO EXECUTE OUR
BUSINESS PLAN.

    We expect that the net proceeds from this offering and cash from operations
will be sufficient to meet our working capital and capital expenditure needs for
at least the next 12 months. After that, we will need to raise additional funds
for a number of uses, including:

    - expanding research and development programs;

    - hiring additional qualified personnel;

    - implementing further marketing and sales activities; and

    - acquiring complementary technologies or businesses.

    We may have to raise funds even sooner in order to fund more rapid
expansion, to respond to competitive pressures or otherwise to respond to
unanticipated requirements. If we raise additional funds through the issuance of
equity or convertible debt securities, the percentage ownership of our existing
stockholders will be reduced. We may not be able to obtain additional funds on
acceptable terms or at all. If we cannot raise needed funds on acceptable terms,
we may not be able to increase our ongoing operations and complete our planned
expansion, take advantage of acquisition opportunities, develop or enhance
systems or respond to competitive pressures. This potential inability to raise
funds on acceptable terms could seriously harm our business.

                                       12

GOVERNMENT REGULATION AND INDUSTRY STANDARDS MAY INCREASE OUR COSTS OF DOING
BUSINESS, LIMIT OUR POTENTIAL MARKETS OR REQUIRE CHANGES IN OUR BUSINESS MODEL.

    Our business model is premised on the availability of certain radio
frequencies for broadband two-way communications. Radio frequencies are subject
to extensive regulation under the laws of the United States, foreign laws and
international treaties. Each country has different regulations and regulatory
processes for wireless communications equipment and uses of radio frequencies.
The regulatory environment in which we operate is subject to significant change,
the results and timing of which are uncertain. Historically, in many countries
the unavailability of radio frequencies for two-way broadband communications has
inhibited the growth of such networks. The process of establishing new
regulations for broadband wireless frequencies and allocating such frequencies
to operators is complex and lengthy. Our customers and potential customers may
not be able to obtain sufficient frequencies for their planned uses of our
systems. Failure by the regulatory authorities to allocate suitable, sufficient
radio frequencies for such uses in a timely manner could deter potential
customers from ordering our systems and seriously harm our business.

    Our systems must conform to a variety of domestic, foreign and international
regulatory requirements established to, among other things, avoid interference
among users of radio frequencies and permit interconnection of equipment.
Regulatory bodies worldwide have adopted and are adopting or revising standards
for wireless communications products. The emergence or evolution of regulations
and industry standards for broadband wireless products, through official
standards committees or widespread use by operators, could require us to modify
our systems, which may be expensive and time-consuming, and incur substantial
compliance costs and seriously harm our business.

    We are subject to export control laws and regulations with respect to all of
our products and technology. We are subject to the risk that more stringent
export control requirements could be imposed in the future on product classes
that include products exported by us, which would result in additional
compliance burdens and could impair the enforceability of our contract rights.
Some of our products contain encryption technologies to enable the transfer of
data in a manner that preserves the privacy of the parties communicating such
data. United States law requires that we obtain an export license for our
systems and that we comply with various restrictions on exporting our systems to
certain countries. Our United States license expires October 31, 2000. We expect
that we will be able to renew this license as necessary from time to time, but
we can not be certain that we will be able to do so. In addition, we may be
required to apply for additional licenses to cover modifications and
enhancements to our products. Any revocation or expiration of any requisite
license, the failure to obtain a license for product modifications and
enhancements, or more stringent export control requirements could seriously harm
our business.

IF WE FAIL TO SUCCESSFULLY ESTABLISH OUR NEW VYYO NAME, OUR BUSINESS COULD BE
SERIOUSLY HARMED.

    In January 2000, we changed our name from PhaseCom, Inc. to Vyyo Inc. to
better represent the diversity of our broadband wireless systems. Our new Vyyo
name may cause confusion to current and potential customers, which could
seriously harm our business. We may be unable to enforce rights related to the
Vyyo Inc. name, we may not be free to use the name in all jurisdictions, our use
of the name may be challenged and we may be required to expend significant
resources in defending the use of the name.

                                       13

                        RISKS RELATING TO THIS OFFERING

BECAUSE OUR PRINCIPAL STOCKHOLDERS AND MANAGEMENT HAVE THE ABILITY TO CONTROL
STOCKHOLDER VOTES, THE PREMIUM OVER MARKET PRICE THAT AN ACQUIRER MIGHT
OTHERWISE PAY MAY BE REDUCED AND ANY MERGER OR TAKEOVER MAY BE DELAYED.

    Upon completion of this offering, our    largest stockholders will
beneficially own approximately   % of our outstanding common stock. As a result,
these stockholders, acting together, will be able to control the outcome of all
matters submitted for stockholder action, including:

    - electing members to our board of directors;

    - approving significant change-in-control transactions;

    - determining the amount and timing of dividends paid to themselves and to
      our public stockholders; and

    - controlling our management and operations.

    This concentration of ownership may have the effect of impeding a merger,
consolidation, takeover or other business consolidation involving us, or
discouraging a potential acquirer from making a tender offer for our shares.
This concentration of ownership could also negatively affect our stock's market
price or decrease any premium over market price that an acquirer might otherwise
pay.

BECAUSE THE NASDAQ NATIONAL MARKET IS LIKELY TO CONTINUE TO EXPERIENCE EXTREME
PRICE AND VOLUME FLUCTUATIONS, THE PRICE OF OUR STOCK MAY DECLINE.

    The market price of our shares is likely to be highly volatile and could be
subject to wide fluctuations in response to numerous factors, including the
following:

    - actual or anticipated variations in our quarterly operating results or
      those of our competitors;

    - announcements by us or our competitors of new products or technological
      innovations;

    - introduction and adoption of new industry standards;

    - changes in financial estimates or recommendations by securities analysts;

    - changes in the market valuations of our competitors;

    - announcements by us or our competitors of significant acquisitions or
      partnerships; and

    - sales of our common stock.

    Many of these factors are beyond our control and may negatively impact the
market price of our common stock, regardless of our performance. In addition,
the stock market in general, and the market for technology companies in
particular, has been highly volatile. Our common stock may not trade at the same
levels of shares as that of other technology companies and shares of technology
companies, in general, may not sustain their current market prices. In the past,
securities class action litigation has often been brought against a company
following periods of volatility in the market price of its securities. We may be
the target of similar litigation in the future. Securities litigation could
result in substantial costs and divert management's attention and resources,
which could seriously harm our business and operating results.

OUR MANAGEMENT HAS BROAD DISCRETION IN USING THE PROCEEDS FROM THIS OFFERING,
WHICH MIGHT NOT BE USED IN WAYS THAT IMPROVE OUR OPERATING RESULTS OR INCREASE
OUR MARKET VALUE.

    Our management will have broad discretion as to how the net proceeds of this
offering will be used, including uses which may not improve our operating
results or increase our market value.

                                       14

Investors will be relying on the judgment of management regarding the
application of the proceeds of this offering. The results and the effectiveness
of the application of the proceeds are uncertain and you will not have the
opportunity, as part of your investment decision, to assess whether the proceeds
are being used appropriately.

PROVISIONS OF OUR GOVERNING DOCUMENTS AND DELAWARE LAW COULD DISCOURAGE
ACQUISITION PROPOSALS OR DELAY A CHANGE IN CONTROL.

    Upon the closing of this offering, our certificate of incorporation and
bylaws will be amended and restated. Our amended and restated certificate of
incorporation and bylaws will contain anti-takeover provisions that could make
it more difficult for a third party to acquire control of us, even if that
change in control would be beneficial to stockholders. Specifically:

    - our board of directors will have the authority to issue common stock and
      preferred stock and to determine the price, rights and preferences of any
      new series of preferred stock without stockholder approval;

    - our board of directors will be divided into three classes, each serving
      three-year terms;

    - super-majority voting will be required to amend key provisions of our
      certificate of incorporation and by-laws;

    - there will be limitations on who can call special meetings of
      stockholders;

    - stockholders will not be able take action by written consent; and

    - advance notice will be required for nominations of directors and for
      stockholder proposals.

    In addition, provisions of Delaware law and our stock option plans may also
discourage, delay or prevent a change of control or unsolicited acquisition
proposals.

FUTURE SALES OF OUR COMMON STOCK COULD DEPRESS OUR STOCK PRICE.

    We cannot predict if future sales of our common stock, or the availability
of our common stock for sale, will depress the market price for our common stock
or our ability to raise capital by offering equity securities. Sales of
substantial amounts of common stock, or the perception that these sales could
occur, may depress prevailing market prices for the common stock.

    After this offering, approximately           shares of common stock will be
outstanding. All of the shares sold in this offering will be freely tradeable
except for any shares purchased by affiliates of Vyyo. The remaining shares of
common stock outstanding after this offering will be restricted as a result of
securities laws or lock-up agreements. These remaining shares will be available
for sale in the public market as follows:



DATE OF AVAILABILITY FOR SALE                                 NUMBER OF SHARES
- -----------------------------                                 ----------------
                                                           
As of the date of this prospectus...........................
          , 2000............................................
At various times thereafter upon expiration of applicable
  holding periods...........................................


    Banc of America Securities LLC may release all or a portion of the shares
subject to lock-up agreements at any time without notice. See "Underwriting" and
"Shares Eligible for Future Sale."

                                       15

                    RISKS RELATING TO OUR LOCATION IN ISRAEL

CONDITIONS IN ISRAEL AFFECT OUR OPERATIONS AND MAY LIMIT OUR ABILITY TO PRODUCE
AND SELL OUR SYSTEMS.

    Our final testing and assembly and research and development facilities are
located in Israel. Political, economic and military conditions in Israel
directly affect our operations. Since the establishment of the State of Israel
in 1948, a number of armed conflicts have taken place between Israel and its
Arab neighbors and a state of hostility, varying in degree and intensity, has
led to security and economic problems for Israel. We could be adversely affected
by any major hostilities involving Israel, the interruption or curtailment of
trade between Israel and its trading partners, a significant increase in
inflation, or a significant downturn in the economic or financial condition of
Israel. Despite the progress towards peace between Israel and its Arab
neighbors, the future of these peace efforts is uncertain. Moreover, several
countries still restrict business with Israel and with Israeli companies. We
could be adversely affected by restrictive laws or policies directed towards
Israel or Israeli businesses.

    Some of our directors, officers and employees are currently obligated to
perform annual reserve duty and are subject to being called to active duty at
any time under emergency circumstances. Our business cannot assess the full
impact of these requirements on our workforce or business if conditions should
change and we cannot predict the effect on us of any expansion or reduction of
these obligations.

BECAUSE SUBSTANTIALLY ALL OF OUR REVENUES ARE GENERATED IN U.S. DOLLARS WHILE A
PORTION OF OUR EXPENSES ARE INCURRED IN NEW ISRAELI SHEKELS, OUR RESULTS OF
OPERATIONS MAY BE SERIOUSLY HARMED IF THE RATE OF INFLATION IN ISRAEL EXCEEDS
THE RATE OF DEVALUATION OF THE NEW ISRAELI SHEKEL AGAINST THE U.S. DOLLAR.

    We generate substantially all of our revenues in U.S. dollars, but we incur
a substantial portion of our expenses, principally salaries and related
personnel expenses related to research and development, in New Israeli shekels,
or NIS. As a result, we are exposed to the risk that the rate of inflation in
Israel will exceed the rate of devaluation of the NIS in relation to the dollar
or that the timing of this devaluation lags behind inflation in Israel. If the
dollar costs of our operations in Israel increase, our dollar-measured results
of operations will be seriously harmed.

THE GOVERNMENT PROGRAMS AND BENEFITS WE RECEIVE REQUIRE US TO SATISFY PRESCRIBED
CONDITIONS. THESE PROGRAMS AND BENEFITS MAY BE TERMINATED OR REDUCED IN THE
FUTURE, WHICH WOULD INCREASE OUR COSTS AND TAXES AND COULD SERIOUSLY HARM OUR
BUSINESS.

    Several of our capital investments have been granted "approved enterprise"
status under Israeli law. The portion of our income derived from our approved
enterprise program will be exempt from tax for a period of four years commencing
in the first year in which we have taxable income, and we will be subject to a
reduced tax rate for the remaining term of the programs. The benefits available
to an approved enterprise are conditioned upon the fulfillment of conditions
stipulated in applicable law and in the specific certificate of approval. If we
fail to comply with these conditions, in whole or in part, we may be required to
pay additional taxes for the period in which we benefitted from the tax
exemption or reduced tax rates and would likely be denied these benefits in the
future. From time to time, the Government of Israel has discussed reducing or
eliminating the benefits available under the approved enterprise program. These
tax benefits may not be continued in the future at their current levels or at
all. This termination or reduction of these benefits would increase our taxes
and could seriously harm our business.

    In the past, we received grants from the government of Israel for the
financing of a portion of our research and development expenditures in Israel.
One of the conditions to the receipt of these grants is that we pay royalties to
the government on revenues derived from the sale of products and services
resulting from the research and development funded by these grants. If we fail
to comply with these conditions, we could be required to refund any payments
previously received together with interest and

                                       16

penalties. In addition, the regulations under which we received these grants
restrict our ability to manufacture products or transfer technology outside of
Israel for products developed with this technology. If the Chief Scientist
consents to the manufacture of products outside of Israel, we may be required to
pay increased royalties, ranging from 120% to 300% of the amount of the Chief
Scientist grant, depending on the percentage of foreign manufacture. We believe
that our current products are not subject to this restriction. However, some of
our manufacturing activities are performed by subcontractors outside of Israel.
If the government of Israel were to determine that our products must be
manufactured in Israel, our business would be harmed.

IT MAY BE DIFFICULT TO ENFORCE A U.S. JUDGMENT AGAINST US AND OUR NONRESIDENT
OFFICERS, DIRECTORS AND EXPERTS.

    Our Chief Technology Officer, one of our directors and some of the experts
named in this prospectus are nonresidents of the United States, and a
substantial portion of our assets and the assets of these persons are located
outside the United States. Therefore, it may be difficult to enforce a judgment
obtained in the United States based upon the civil liabilities provisions of the
United States federal securities laws against us or any of those persons or to
effect service of process upon these persons in the United States.

                 CAUTIONARY NOTE ON FORWARD-LOOKING STATEMENTS

    Some of the matters discussed under the captions "Prospectus Summary," "Risk
Factors," "Management's Discussion and Analysis of Financial Condition and
Results of Operations," "Business" and elsewhere in this prospectus include
forward-looking statements. We have based these forward-looking statements on
our current expectations and projections about future events, including, among
other things:

    - implementing our business strategy;

    - attracting and retaining customers and employees;

    - obtaining and expanding market acceptance of the products we offer;

    - forecasts of Internet usage and the size and growth of relevant markets;

    - rapid technological changes in our industry and relevant markets; and

    - competition in our market.

    In some cases, you can identify forward-looking statements by terminology
such as "may," "will," "should," "could," "predicts," "potential," "continue,"
"expects," "anticipates," "future," "intends," "plans," "believes," "estimates"
and similar expressions. These statements are based on our current beliefs,
expectations and assumptions and are subject to a number of risks and
uncertainties. Actual results, levels of activity, performance, achievements and
events may vary significantly from those implied by the forward-looking
statements. A description of risks that could cause our results to vary appears
under the caption "Risk Factors" and elsewhere in this prospectus. These
forward-looking statements are made as of the date of this prospectus, and we
assume no obligation to update them or to explain the reasons why actual results
may differ.

                                       17

                                USE OF PROCEEDS

    We estimate that we will receive net proceeds from the sale of shares of our
common stock in this offering of approximately $         million, or
$      million if the underwriters exercise their over-allotment option in full,
based upon an assumed offering price of $         per share and after deducting
underwriting discounts and commissions and estimated offering expenses. The
principal purposes of this offering are to obtain additional capital and to
create a public market for our common stock. We expect to use the net proceeds
from this offering for working capital and other general corporate purposes. We
may use a portion of the net proceeds to acquire complementary products,
technologies, or businesses; however, we currently have no commitments or
agreements relating to any such transactions.

    We will have significant discretion in the use of the net proceeds of this
offering. Investors will be relying on the judgment of our management regarding
the application of the proceeds of this offering. Pending use of the net
proceeds as discussed above, we intend to invest these funds in short-term,
interest-bearing, investment-grade obligations.

                                DIVIDEND POLICY

    We have never declared or paid any dividends on our capital stock. We intend
to retain any future earnings to fund the development and expansion our
business. Therefore, we do not anticipate paying cash dividends on our common
stock in the foreseeable future. Through our subsidiary, Vyyo Ltd., we
participate in the "alternative benefits program" under the Israeli law for the
Encouragement of Capital Investments, 1959, under which we realize certain tax
exemptions. If Vyyo Ltd. distributes a cash dividend to Vyyo Inc. from income
which is tax exempt, it would have to pay corporate tax at the rate of up to 25%
on an amount equal to the amount distributed and the corporate tax which would
have been due in the absence of the tax exemption.

                                       18

                                 CAPITALIZATION

    The following table sets forth as of December 31, 1999:

    - our actual capitalization;

    - our pro forma capitalization, assuming the conversion of our preferred
      stock; and

    - our pro forma as adjusted capitalization after giving effect to the sale
      of the shares of common stock in this offering at an assumed initial
      public offering price of $      per share after deducting the underwriting
      discounts and commissions and estimated offering expenses.

    This information should be read in conjunction with our consolidated
financial statements and the related notes and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" appearing elsewhere
in this prospectus.



                                                                   AS OF DECEMBER 31, 1999
                                                              ----------------------------------
                                                                                      PRO FORMA
                                                               ACTUAL    PRO FORMA   AS ADJUSTED
                                                              --------   ---------   -----------
                                                              (IN THOUSANDS, EXCEPT SHARE DATA)
                                                                            
Bank line of credit.........................................  $  2,280   $  2,280      $  2,280
                                                              ========   ========      ========

Stockholders' equity:
  Convertible preferred stock, $0.001 par value at amounts
    paid in; 100,000,000 shares authorized, 11,564,269
    shares issued and outstanding, actual; no shares issued
    and outstanding pro forma; 5,000,000 shares authorized,
    no shares issued and outstanding pro forma as
    adjusted................................................  $ 15,369   $     --      $     --
  Common stock, $0.0001 par value at amounts paid in;
    200,000,000 shares authorized, 15,335,155 shares issued
    and outstanding, actual; 17,964,857 shares issued and
    outstanding pro forma;       shares issued and
    outstanding, pro forma as adjusted......................    27,612     42,981
  Note receivable from stockholder..........................      (920)      (920)         (920)
  Deferred compensation.....................................    (6,000)    (6,000)       (6,000)
  Accumulated deficit.......................................   (34,756)   (34,756)      (34,756)
                                                              --------   --------      --------
Total stockholders' equity..................................     1,305      1,305
                                                              --------   --------      --------
Total capitalization........................................  $  1,305   $  1,305      $
                                                              ========   ========      ========


    The shares of common stock outstanding in the actual, pro forma and pro
forma as adjusted columns exclude:

    - 2,449,425 shares of common stock issuable as of December 31, 1999 upon the
      exercise of outstanding stock options issued under our option plans at a
      weighted average exercise price of $1.03 per share;

    - 3,512,000 shares of common stock initially reserved for issuance under our
      stock option plans;

    - 500,000 shares of common stock initially reserved for issuance under our
      employee stock purchase plan; and

    - 125,190 shares of common stock issuable as of December 31, 1999 upon the
      exercise of outstanding warrants with a weighted average exercise price of
      $1.89 per share.

                                       19

                                    DILUTION

    Our pro forma net tangible book value as of December 31, 1999 was
approximately $1.3 million, or $0.07 per share of common stock. Pro forma net
tangible book value per share represents the amount of total tangible assets
less total liabilities, divided by 17,964,857, the number of shares of common
stock treated as outstanding on a pro forma basis after giving effect to the
conversion of the preferred stock. After giving effect to the sale of the shares
of common stock offered in this offering at the assumed public offering price,
our pro forma net tangible book value at December 31, 1999 would have been
$         , or $      per share. This represents an immediate increase in net
pro forma tangible book value to existing stockholders of $      per share and
an immediate dilution of $      per share to new investors. The following table
illustrates the per share dilution:


                                                                   
Assumed initial public offering price per share:............              $
                                                                          ------
  Pro forma net tangible book value per share before this
    offering as of December 31, 1999........................   $0.07
                                                               -----
  Increase per share attributable to new investors..........
                                                               -----
Pro forma net tangible book value per share after this
  offering..................................................
                                                                          ------
Dilution per share to new investors                                       $
                                                                          ======


    The following table summarizes on a pro forma basis, after giving effect to
the conversion of the preferred stock, the total number of shares of common
stock purchased from us, the total consideration paid to us and the average
price per share paid by existing stockholders and by new investors, in each case
based upon the number of shares of common stock outstanding as of December 31,
1999.



                                               SHARES PURCHASED       TOTAL CONSIDERATION      AVERAGE
                                             ---------------------   ----------------------     PRICE
                                               NUMBER     PERCENT      AMOUNT      PERCENT    PER SHARE
                                             ----------   --------   -----------   --------   ---------
                                                                               
Existing stockholders......................  17,964,857         %    $33,381,000         %      $1.86
New investors..............................
                                             ----------    -----     -----------    -----
  Total....................................                100.0%    $              100.0%
                                             ==========    =====     ===========    =====


    If the underwriters' over-allotment is exercised in full, the number of
shares of common stock held by existing stockholders will be reduced to       ,
or       % of the total number of shares of common stock to be outstanding after
this offering and the number of shares of common stock held by new investors
will increase to       , or       % of the total number of shares of common
stock to be outstanding immediately after this offering.

    The foregoing discussions and tables assume no exercise of any stock options
or warrants outstanding. As of December 31, 1999, there were options outstanding
to purchase 2,449,425 shares of common stock at a weighted average exercise
price of $1.03 per share and warrants outstanding to purchase 125,190 shares of
common stock at a weighted average exercise price of $1.89 per share. To the
extent that any of these options or warrants are exercised, there will be
further dilution to the new investors.

                                       20

                      SELECTED CONSOLIDATED FINANCIAL DATA

    The statements of operations data for each of the years in the three-year
period ended December 31, 1999 and the balance sheet data at December 31, 1998
and 1999 are derived from our audited financial statements included elsewhere in
this prospectus. The statements of operations data for the year ended
December 31, 1996 and the balance sheet data at December 31, 1996 and 1997, are
derived from our audited financial statements that are not included in this
prospectus. The statements of operations data for the year ended December 31,
1995 and the balance sheet data at December 31, 1995 are derived from our
unaudited financial statements that are not included in this prospectus. The
following selected consolidated financial data should be read in conjunction
with our consolidated financial statements and related notes and "Management's
Discussion and Analysis of Financial Condition and Results of Operations"
included elsewhere in this prospectus.



                                                               YEAR ENDED DECEMBER 31,
                                                 ----------------------------------------------------
                                                   1995       1996       1997       1998       1999
                                                 --------   --------   --------   --------   --------
                                                        (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                                                              
STATEMENT OF OPERATIONS DATA:
Net revenues...................................  $   759    $   478    $ 1,537    $ 2,449    $  4,230
Cost of revenues...............................      658        896      1,556      2,568       4,316
                                                 -------    -------    -------    -------    --------
Gross profit (loss)............................      101       (418)       (19)      (119)        (86)
Operating expenses:
  Research and development.....................      649      1,444      2,398      3,252       3,678
  Sales and marketing..........................      527        929      1,484      2,413       1,972
  General and administrative...................      854      1,180      1,200      1,363       2,148
  Amortization of deferred compensation........       --         --         --         --       3,600
                                                 -------    -------    -------    -------    --------
Total operating expenses.......................    2,030      3,553      5,082      7,028      11,398
                                                 -------    -------    -------    -------    --------
Operating loss.................................   (1,929)    (3,971)    (5,101)    (7,147)    (11,484)
  Interest and other income (expense), net.....     (750)      (131)      (244)      (524)       (717)
                                                 -------    -------    -------    -------    --------
Net loss.......................................  $(2,679)   $(4,102)   $(5,345)   $(7,671)   $(12,201)
                                                 =======    =======    =======    =======    ========
Net loss per share:
  Basic and diluted............................                        $ (8.86)   $ (8.15)   $  (2.27)
                                                                       =======    =======    ========
  Pro forma basic and diluted (unaudited)......                                              $  (1.81)
                                                                                             ========
Shares used in per share computations:
  Basic and diluted............................                            603        941       5,385
                                                                       =======    =======    ========
  Pro forma basic and diluted (unaudited)......                                                 6,758
                                                                                             ========




                                                                         DECEMBER 31,
                                                     ----------------------------------------------------
                                                       1995       1996       1997       1998       1999
                                                     --------   --------   --------   --------   --------
                                                                        (IN THOUSANDS)
                                                                                  
BALANCE SHEET DATA:
Cash and cash equivalents..........................   $  695     $1,459     $  510    $   131     $5,036
Working capital (deficiency).......................     (658)       785     (4,497)   (10,581)       210
Total assets.......................................    2,309      3,074      2,976      3,139      8,161
Long-term obligations, net of current portion......       71      2,328        394         --         --
Total shareholders' equity (net capital
  deficiency)......................................     (470)      (560)    (3,811)    (9,571)     1,305


                                       21

                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

    THE FOLLOWING DISCUSSION SHOULD BE READ IN CONJUNCTION WITH THE CONSOLIDATED
FINANCIAL STATEMENTS AND THE RELATED NOTES THAT APPEAR ELSEWHERE IN THIS
PROSPECTUS. THE FOLLOWING DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS THAT
REFLECT OUR PLANS, ESTIMATES AND BELIEFS. OUR ACTUAL RESULTS COULD DIFFER
MATERIALLY FROM THOSE DISCUSSED IN THE FORWARD-LOOKING STATEMENTS. FACTORS THAT
COULD CAUSE OR CONTRIBUTE TO THESE DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO,
THOSE DISCUSSED BELOW AND ELSEWHERE IN THIS PROSPECTUS, PARTICULARLY IN "RISK
FACTORS."

OVERVIEW

    We are a leading global provider of broadband wireless access systems used
by telecommunications service providers to deliver wireless, high-speed data
connections to business and residential subscribers. We sell our systems
directly to service providers, as well as to system integrators that deploy our
systems as part of their end-to-end network solutions for service providers. We
have incurred significant losses since our inception, and we expect to continue
to incur net losses for the foreseeable future. We incurred net losses of
approximately $12.2 million for the year ended December 31, 1999. As of
December 31, 1999, our accumulated deficit was approximately $34.8 million.

    We were incorporated in 1996 in Delaware and succeeded to the business of
PhaseCom Ltd., an Israeli company, under a reorganization. As a result,
PhaseCom Ltd. became our wholly-owned subsidiary. Prior to our introduction of
broadband wireless access systems, we developed and marketed cable broadband
communication systems. Our first generation broadband wireless system was
commercially deployed during the first quarter of 1999 for the LMDS and MMDS
frequency bands. Our second generation broadband wireless access system was
commercially deployed during the first quarter of 2000 for the LMDS and MMDS
frequency bands. Our systems have been commercially deployed at 21 domestic and
international sites.

RESULTS OF OPERATIONS

    NET REVENUES.  Net revenues include product revenues and, in 1999,
technology development revenues. Product revenues are derived primarily from
sales of hubs and modems to telecommunications service providers and to system
integrators. Product revenues are generally recorded when products are shipped,
provided there are no customer acceptance requirements and we have no additional
performance obligations. We accrue for estimated sales returns or exchanges and
product warranty and liability costs upon recognition of product revenues.
Technology development revenues consist of license fees paid by Philips
Semiconductor under a license and development agreement, and are recognized when
the applicable customer milestones are met, including deliverables, but not in
excess of the estimated amount that would be recognized using the
percentage-of-completion method. We expect to complete this arrangement in 2000
and no other similar arrangements are contemplated. Deferred revenues represent
the gross profit on product revenues subject to return or exchange and total
payments on technology development not yet recognized.

    In 1999, approximately 61% of our revenues were derived from customers in
North America, 22% from customers in Europe, 13% from customers in Asia and 4%
from other regions.

    Our revenue is concentrated among relatively few customers. In 1999, four
customers collectively accounted for approximately 59% of our net revenues. In
1999, revenues from each of four customers represented approximately 20%, 14%,
13% and 12% of net revenues. In 1998, revenues from each of three customers
represented approximately 31%, 23% and 15% of net revenues. In 1997, revenue
from each of three customers represented approximately 27%, 12% and 11% of total
revenues. Though our

                                       22

principal revenue-generating customers are likely to vary on a quarterly basis,
we anticipate that our revenues will remain concentrated among a few customers
for the foreseeable future. In August 1999, ADC Telecommunications, Inc., one of
our major customers made an approximately 10% equity investment in Vyyo.

    Net revenues increased 59% from $1.5 million in 1997 to $2.4 million in 1998
and 73% to $4.2 million in 1999. This increase primarily reflects the increase
in unit sales of our systems in 1998 and 1999 and the technology development
activities in 1999. Product revenues recognized in 1999 relate to sales of cable
and wireless modem products. All of the product revenues in 1998 and 1997 relate
to sales of cable modem products that we are no longer developing. Accordingly,
the success of our business will be entirely dependent upon the success of our
wireless products. We do not anticipate recognizing material amounts of revenue
from cable modem products in subsequent periods. Technology development revenues
were $480,000 in 1999.

    COST OF REVENUES.  Cost of revenues consist of costs of product revenues and
for 1999, also $313,000 of costs of technology development revenues. Cost of
technology development revenues consists of component and material costs, direct
labor costs, warranty costs, royalties in connection with Israeli government
incentive programs, and overhead related to manufacturing our products. Cost of
technology development consists of direct labor costs and materials for the
engineering efforts related to the technology development arrangement.

    Cost of revenues increased from $1.6 million in 1997 to $2.6 million in 1998
and to $4.3 million in 1999. These increases were attributable primarily to
increased shipments of our products in each of the three years and in 1999, also
to the technology development activities. Gross margins were negative in each
year. Gross margins in 1997 and 1998 were negatively affected by the high
initial fixed costs and low volumes associated with our proprietary cable modem
products. In addition, gross margins in 1999 were negatively affected by the
high fixed costs associated with the first generation wireless modem products
and inventory write-offs associated with the discontinuation of in-house cable
modem assembly, as well as the replacement of a modem system for a key customer
with next-generation technology. We expect that our gross margins will continue
to fluctuate.

    Prior to 1997, we participated in several Israeli government research and
development incentive programs, under which we received research and development
participation of approximately $3.7 million. We are obligated to pay royalties
at rates that generally range from 2.5% to 3% of revenues resulting from the
funded projects up to maximum amounts of 100% or 150% of the funded amount. As
of December 31, 1999, we had repaid or provided for the repayment of grants
amounting to $651,000. As we currently do not intend to proceed with the
manufacture and sale of products developed within all of the projects funded by
the Chief Scientist or by the BIRD Foundation, we believe that the remaining
contingent royalty liability is approximately $800,000.

    RESEARCH AND DEVELOPMENT EXPENSES.  Research and development expenses
consist primarily of personnel, facilities, equipment and supplies for our
research and development activities. Substantially all of our research and
development activities are carried out in our facility in Israel. These expenses
are charged to operations as incurred. Our research and development expenses
increased from $2.4 million in 1997 to $3.3 million in 1998 and to $3.7 million
in 1999. These increases were due to increased levels of activities and related
costs of personnel and facilities. We believe significant investment in research
and development is essential to our future success and plan on increasing our
research and development activities, including recruiting and hiring additional
personnel and expanding our research and development facility to accommodate the
additional personnel, which will result in increased expenses in absolute
dollars. Accordingly, we expect that research and development expenses will
continue to increase in future periods.

                                       23

    SALES AND MARKETING EXPENSES.  Sales and marketing expenses consist of
salaries and related costs of sales and marketing employees, consulting fees and
expenses for travel, trade shows and promotional activities. Selling and
marketing expenses increased from $1.5 million in 1997 to $2.4 million in 1998
and decreased to $2.0 million in 1999. The fluctuation in sales and marketing
expenses in each of the years was primarily due to changes in the number of
sales and marketing personnel. We plan on increasing our sales and marketing
activities, including recruiting and hiring additional senior personnel, which
will result in increased expenses in absolute dollars. Accordingly, we expect
that sales and marketing expenses will increase in future periods.

    GENERAL AND ADMINISTRATIVE EXPENSES.  General and administrative expenses
consist primarily of personnel and related costs for general corporate
functions, including finance, accounting, strategic and business development,
human resources and legal. General and administrative expenses increased from
$1.2 million in 1997 to $1.4 million in 1998 to $2.1 million in 1999. We
recently hired additional senior management personnel and are planning to expand
operational and corporate activities, including support of our operations as a
public company. We expect that general and administrative expenses will increase
in future periods.

    AMORTIZATION OF DEFERRED STOCK COMPENSATION.  Deferred stock compensation
represents the aggregate differences between the respective exercise price of
stock options or purchase price of stock at their dates of grant or sale and the
deemed fair market value of our common stock for accounting purposes. Deferred
stock compensation is presented as a reduction of stockholders' equity and is
amortized over the vesting period of the underlying options. Amortization
expense was $3.6 million in 1999. We currently expect to record amortization of
deferred stock compensation of approximately $3.5 million in 2000, $1.5 million
in 2001 and $1.0 million thereafter.

    INTEREST INCOME (EXPENSE), NET.  Interest income (expense) consists of
interest earned on cash and cash equivalents offset by interest expense related
to bank loans and convertible notes. Net interest expense increased from
($244,000) in 1997 to ($524,000) in 1998 to ($717,000) in 1999 due to increased
borrowings.

    INCOME TAXES.  As of December 31, 1999, we had approximately $19 million of
Israeli net operating loss carryforwards and $6 million of United States federal
and state net operating loss carryforwards. The Israeli net operating loss
carryforwards have no expiration date. The United States net operating loss
carryforwards expire in various amounts between the years 2004 and 2019. We have
provided a full valuation allowance against our net deferred tax assets as the
future realization of the tax benefit is not sufficiently assured.

QUARTERLY RESULTS OF OPERATIONS

    The table below sets forth statement of operations data for each of the four
consecutive quarters for the year ended December 31, 1999. This information has
been derived from our unaudited consolidated financial statements. The unaudited
consolidated financial statements have been prepared on the same basis as our
audited consolidated financial statements contained elsewhere in this prospectus
and include all adjustments, consisting only of normal recurring adjustments,
that we consider necessary for a fair presentation of such information. The
information should be read in conjunction with our consolidated financial
statements and notes thereto appearing elsewhere in this prospectus. Our limited
operating history makes the prediction of future operating results difficult or

                                       24

impossible. We believe that period-to-period comparisons of our financial
results are not necessarily meaningful and should not be relied upon as an
indication of future performance.



                                                                        QUARTER ENDED
                                                    ------------------------------------------------------
                                                    MARCH 31,    JUNE 30,    SEPTEMBER 30,   DECEMBER 31,
                                                       1999        1999          1999            1999
                                                    ----------   ---------   -------------   -------------
                                                                        (IN THOUSANDS)
                                                                                 
STATEMENTS OF OPERATIONS DATA:
Net revenues......................................       942       1,024         1,110           1,154
Cost of revenues..................................      (864)     (1,147)       (1,111)         (1,194)
                                                      ------      ------        ------          ------
Gross profit (loss)...............................        78        (123)           (1)            (40)
Operating expenses:
  Research and development........................       785         868           842           1,183
  Sales and marketing.............................       378         376           574             644
  General and administrative......................       429         415           597             707
  Amortization of deferred compensation...........        --         300           200           3,100
                                                      ------      ------        ------          ------
Total operating expenses..........................     1,592       1,959         2,213           5,634
                                                      ------      ------        ------          ------
Operating loss....................................    (1,514)     (2,082)       (2,214)         (5,674)
  Interest and other income (expense), net........      (198)       (195)         (163)           (161)
                                                      ------      ------        ------          ------
Net loss..........................................    (1,712)     (2,277)       (2,377)         (5,835)
                                                      ======      ======        ======          ======


    Cost of revenues in the second quarter of 1999 reflects inventory
write-downs associated with discontinuation of in-house cable modem production.
Operating expenses in the third and fourth quarters of 1999 reflect higher sales
and marketing and general and administrative expenses due primarily to the
general increase in personnel and the increase in sales and marketing and
corporate activities. Our quarterly operating results have varied significantly
in the past and are likely to vary significantly in the future. These variations
result from a number of factors, many of which are beyond our control. In
addition, our operating results may be below the expectations of securities
analysts and investors in future periods. Our failure to meet these expectations
will likely cause our share price to decline.

LIQUIDITY AND CAPITAL RESOURCES

    Since our inception, we have funded operations primarily through the private
placement of our equity securities and borrowings from stockholders and banks.
We raised approximately $4.1 million in 1997, $6.7 million in 1998 and
$11.7 million in 1999 in convertible debt and equity. As of December 31, 1999,
we had cash and cash equivalents of approximately $5.0 million.

    Cash used by operations include expenditures associated with development
activities and marketing efforts related to commercialization of our products.
In 1999, cash used in operations was $6.2 million comprised of our net loss of
$12.2 million, increase in accounts receivable of $336,000, partially offset by
a decrease in inventories of $512,000 and increase in accounts payable and
accrued liabilities of $1.5 million. In 1998, cash used in operations was
$6.7 million comprised of our net loss of $7.7 million increase in inventory of
$638,000 partially offset by a $1.1 million increase in accounts payable and
accrued liabilities. In 1997, cash used in operations was $4.7 million comprised
of our net loss of $5.3 million, increase in inventory of $639,000 partially
offset by a $1.1 million increase in accounts payable and accrued liabilities.

    We have made investments in property and equipment of approximately
$1.3 million in 1997 through 1999.

                                       25

    We have a line of credit arrangement with a bank for an aggregate amount of
$2,500,000. The loans under this line of credit bear interest at a rate of LIBOR
plus 1.5%. At December 31, 1999, the applicable rate was 7.25% per annum.
Borrowings and bank guarantees under the line of credit were $2,280,000 and
$220,000 at December 31, 1999. As of December 31, 1999, all assets of our
Israeli subsidiary, amounting to approximately $3.0 million, are subject to
fixed and floating liens pursuant to certain loan agreements.

    Our capital requirements depend on numerous factors, including market
acceptance of our products, the resources we devote to developing, marketing,
selling and supporting our products, the timing and extent of establishing
additional international operations and other factors. We expect to devote
substantial capital resources to hire and expand our research and development,
and our sales and marketing organizations, to expand marketing programs and for
other general corporate activities. We expect that the net proceeds from this
offering and cash from operations will be sufficient to meet our working capital
and capital expenditure needs for at least the next 12 months. After that, we
will need to raise additional funds for a number of uses. We may not be able to
obtain additional funds on acceptable terms or at all.

EFFECTIVE CORPORATE TAX RATES

    Our tax rate will reflect a mix of the United States federal and state tax
on our United States income and Israeli tax on non-exempt income. The majority
of our Israeli subsidiary's income is derived from our company's capital
investment program with "Approved Enterprise" status under the Law for the
Encouragement of Capital Investments, and is eligible therefore for tax
benefits. Pursuant to these benefits, we will enjoy a tax exemption on income
derived during the first four years in which this investment program produces
taxable income, provided that we do not distribute such income as a dividend,
and a reduced tax rate of 10 to 15% for up to six subsequent years. All of these
tax benefits are subject to various conditions and restrictions. There can be no
assurance that we will obtain approval for additional Approved Enterprises
Programs or that the provisions of the law will not change. Since we have
incurred tax losses through December 31, 1999, we have not yet used the tax
benefits for which we are eligible.

YEAR 2000 ISSUES

    We currently are not aware of any Year 2000 problem in any of our critical
systems and products. However, the success to date of our Year 2000 efforts
cannot guarantee that a Year 2000 problem affecting third parties upon which we
rely will not become apparent in the future that could harm our business.

RECENT ACCOUNTING PRONOUNCEMENTS

    In June 1998, the Financial Accounting Standards Board issued Statement
No. 133, Accounting for Derivative Instruments and Hedging Activities, or SFAS
No. 133, which establishes accounting and reporting standards for derivative
instruments and hedging activities. The statement requires recognition of all
derivatives at fair value in the financial statements. FASB Statement No. 137,
Accounting for Derivative Instruments and Hedging Activities Deferral of the
Effective Date of FASB Statement No. 133, an amendment of FASB Statement
No. 133, defers implementation of SFAS No. 133 until fiscal years beginning
after June 15, 2000. We believe that upon implementation the standard will not
have a significant effect on our financial statements.

                                       26

DISCLOSURES ABOUT MARKET RISK

    We are exposed to financial market risks including changes in interest rates
and foreign currency exchange rates. As of December 31, 1999, we had cash and
cash equivalents of $5.0 million. Substantially all of these amounts consisted
of checking account cash balances and are therefore not subject to interest rate
risk. Substantially all of our revenue and capital spending is transacted in
U.S. dollars, although a substantial portion of the cost of our operations,
relating mainly to our personnel and facilities in Israel, is incurred in New
Israeli shekels, or NIS. We have not engaged in hedging transactions to reduce
our exposure to fluctuations that may arise from changes in foreign exchange
rates. In the event of an increase in inflation rates in Israel, or if
appreciation of the NIS occurs without a corresponding adjustment in our
dollar-denominated revenues, our results of operation and business could be
materially harmed.

                                       27

                                    BUSINESS

    THIS PROSPECTUS CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE RISKS AND
UNCERTAINTIES. OUR ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE ANTICIPATED
IN THESE FORWARD-LOOKING STATEMENTS AS A RESULT OF THE FACTORS DESCRIBED UNDER
"RISK FACTORS" AND ELSEWHERE IN THIS PROSPECTUS. SEE "CAUTIONARY NOTE ON
FORWARD-LOOKING STATEMENTS."

OVERVIEW

    We are a leading global provider of broadband wireless access systems used
by telecommunications service providers to deliver wireless, high-speed data
connections to business and residential subscribers. Our systems are deployed in
point-to-multipoint applications at the radio frequencies licensed for two-way
broadband communication. Point-to-multipoint technology refers to the ability of
a central, wireless hub to transmit and receive network traffic to and from
multiple subscriber modems. Our point-to-multipoint architecture is based on the
Internet protocol, or IP, which is the networking standard used to deliver voice
and data over the Internet. Our system is designed to allow service providers to
support rapid and cost-effective broadband service roll-outs directly to
business and residential subscribers. Service providers use our system to bridge
the segment of the network which connects the service providers' systems
directly to the subscribers, commonly referred to as the last mile.

    In recent years, the volume of high-speed data traffic across worldwide
communications networks has grown dramatically as the public Internet and
private corporate intranets have been broadly adopted for communications and
e-commerce. This traffic growth has created demand for cost-effective,
high-speed communications, as subscribers increasingly rely on numerous
applications and data-intensive content, such as full-streaming video, voice
over IP and remote access to corporate networks. In the United States and
abroad, the communications industry is in varying stages of deregulation.
Deregulation has created the opportunity for new competitors to offer multiple
communications services directly to subscribers. There are a number of
wire-based technologies that deliver high-speed connections, but performance,
cost, time for deployment or service availability limit the use of these
alternative technologies to satisfy the needs of service providers and
subscribers. High-speed, wireless point-to-multipoint technology, however,
offers service providers numerous advantages over wire-based solutions,
including the ability to rapidly and cost-effectively expand their subscriber
base or to enter new markets while avoiding the limitations of the existing
wire-based infrastructure.

    Our system consists of a wireless hub, located at a base station, and a
wireless subscriber modem, which enables service providers to rapidly deploy
cost-effective, high-speed data connections directly to business and residential
subscribers. Each hub transmits and receives network traffic to and from our
wireless modems which are installed at multiple subscriber locations. Our
integrated network management system optimizes the utilization of system
resources by efficiently allocating bandwidth, which allows service providers to
maximize the number of simultaneous subscribers on a given frequency band. Using
our point-to-multipoint system, service providers can roll out network service
quickly and with a minimal initial investment and can then expand their networks
by adding wireless hub components and subscriber wireless modems as the number
of subscribers grows.

    We sell our systems directly to service providers and system integrators
that deploy our systems as part of their end-to-end network solutions for
service providers. We also provide system integration services to some of our
service provider customers to more effectively implement our systems. As of
January 31, 2000, our systems had been commercially deployed at 21 domestic and
international sites.

                                       28

INDUSTRY BACKGROUND

    Use of the Internet and private communications networks has expanded and
continues to expand rapidly. International Data Corporation estimates that there
were 142 million Internet subscribers at the end of 1998, and projects that this
number will grow to over 500 million subscribers by 2003. Businesses, ranging
from large and small corporate enterprises to home offices, increasingly depend
upon data networks, not only for communication within the office, but also to
exchange information among corporate sites, remote locations, telecommuting
employees, business partners, suppliers and customers. Consumers are also
accessing the Internet to communicate, collect and publish information and
conduct retail purchases. For example, the Chairman of the Federal
Communications Commission, or FCC, recently stated that Internet traffic is
doubling every 100 days and 40% of American households have Internet access.

    The growth in data traffic is resulting in an increase in the demand for
high-speed access. In light of this demand, the FCC has taken steps to increase
the availability of frequencies and bandwidth that may be used by wireless
carriers in the United States for such data transmission. The FCC has increased
the availability of various frequencies within the bands of 24 to 40 Gigahertz,
or GHz, frequencies often referred to as LMDS. In addition, an FCC ruling in
September 1998 allowed license holders of MMDS, or various frequencies within
the band of 2.15 to 2.68 GHz, to offer two-way broadband wireless data services.
Previously, these frequencies had been restricted to one-way video
transmissions. The FCC has also adopted orders to allocate additional spectrum
through auctions during 2000 which can be used by high-speed data transmission
service providers. Opportunities in broadband wireless access are increasing
globally as Europe, Latin America, Asia Pacific and Canada join the United
States in promoting competition in the local communications services market by
allocating frequencies and bandwidth and issuing transmission licenses. In this
regard, at least 26 countries have allocated broadband wireless frequency bands
for use or trials in the last mile, according to Global Telephony.

    Deregulation has been a significant catalyst for increased competition in
the long-haul segment of the market and massive spending on network
infrastructure, as incumbent and emerging carriers have sought to address the
growing demand for bandwidth. In the local access segment of the market,
deregulation has also been a significant catalyst for the growing interest in
providing broadband access directly to subscribers. Data services that
historically were offered only by a single provider for a region now may be
offered by a number of competing service providers. This increased competition
has given local service providers compelling incentives to improve data
transmission rates in order to offer additional value-added services to
subscribers. However, bandwidth limitations of the existing last mile
infrastructure have constrained service providers from exploiting these
opportunities. Last mile links to subscribers typically consist of copper wires
that operate at substantially lower transmission speeds than those offered in
the long-haul segment of a network, or by some available broadband alternatives.
These copper wires were originally intended to carry only analog
circuit-switched, voice signals. As a result, the last mile has become a
bottleneck that limits high-speed data transmission.

    Alternative technologies for broadband access include:

    DIGITAL SUBSCRIBER LINE.  Digital subscriber line, or DSL, technology
improves the data transmission rates of a telephone company's existing copper
wire network. DSL transmission rates are limited, however, by the length and
quality of the available copper wires. This limitation requires customers to be
located within a limited distance from the central office. The implementation of
most digital subscriber line solutions requires the installation of additional
DSL equipment in existing networks. These installation requirements can slow
down service deployment.

    CABLE MODEMS.  Cable modems are designed to provide broadband Internet
access and are targeted primarily at the residential market. Cable lines pass by
100 million homes in North America, but only a portion of those homes currently
have access to two-way cable modem service. In order to

                                       29

fully implement two-way communications, many cable operators must first upgrade
their older networks. Cable modem performance deteriorates as the number of
subscribers simultaneously using the system in a particular coverage area
increases.

    FIBER-BASED SOLUTIONS.  Fiber-based solutions and high-capacity leased lines
offer the highest data transmission rate of any of the alternative technologies
for broadband access. However, these solutions may be costly to deploy for small
business and residential subscribers.

    SATELLITE SYSTEMS.  Satellite systems have been deployed to meet consumers'
communications needs, such as paging and in-home entertainment, and are also
used for high-speed data transmission. However, due to cost and reliability
limitations, as well as the inability of many satellite systems to provide
two-way communications, satellite systems have not been broadly accepted in the
broadband wireless data market.

    POINT-TO-POINT WIRELESS TECHNOLOGY.  Point-to-point wireless technology
enables data transmission using a dedicated radio link between two locations.
Since equipment is required at each end of the link for every subscriber,
point-to-point wireless technology may not be a cost-effective broadband
wireless solution for deployment to a large number of subscribers.

    BROADBAND POINT-TO-MULTIPOINT WIRELESS TECHNOLOGY.  Broadband
point-to-multipoint wireless networks consist of a central, wireless hub that
communicates over radio frequencies to transmit and receive network traffic to
and from wireless modems installed at multiple subscriber locations. Relative to
wire-based, fiber, satellite and point-to-point wireless technologies, broadband
point-to-multipoint wireless technology offers the following advantages:

    - RAPID DEPLOYMENT. Service providers can initiate service quickly because
      they are not required to dig up streets or obtain rights-of-way to install
      copper wire, cable or fiber. Deployment does not depend on locating
      equipment at the facilities of a local telephone company.

    - LOW COST. Service providers can initiate service economically with a
      network as small as a single hub and a small number of subscriber modems.

    - ECONOMIES OF SCALE. Service providers can add subscribers rapidly and
      cost-effectively, since each installed hub can support many subscribers.

    - FLEXIBILITY. Radio frequency technology is flexible, allowing any
      combination of channels to have constant or variable data rates and
      channels with equal or different upstream and downstream data rates.
      Networks can be reconfigured as the market changes, reducing or
      eliminating under-utilized equipment.

    Broadband wireless technology is being utilized by both incumbent and
emerging service providers. The established carriers are expected to use
broadband wireless technology to reach new customers to whom they previously
could not provide access, fill coverage gaps in their existing networks and
deploy value-added services in a cost-effective manner. For example,
International Data Corporation reports that in 1999, Sprint and MCI WorldCom
spent over $1.5 billion to purchase MMDS licenses. Emerging carriers may use
this technology to bypass existing wire-based infrastructure and to compete with
incumbent carriers. In addition, this technology may be used to deploy broadband
services in regions where there is no wire-based communications infrastructure.
International Data Corporation estimates that revenue generated by basic
services delivered via fixed wireless technologies will grow from $767 million
last year to $7.4 billion in 2003.

THE VYYO SOLUTION

    We provide broadband wireless access systems directly to service providers,
as well as to system integrators who deploy our systems as part of their
end-to-end network solutions for service providers.

                                       30

Our systems consist of a wireless hub, located at a base station, and a
subscriber wireless modem, which enables service providers to rapidly deploy
cost-effective, high-speed data connections directly to business and residential
subscribers. Our systems are designed to provide the following benefits:

    COST-EFFECTIVENESS.  Service providers worldwide are beginning to deploy
wireless access technologies as a cost-effective alternative to wire-based
communications. Our wireless system avoids many of the costs associated with
wire-based solutions, such as costs of installing copper wire, cable or fiber
and obtaining access rights-of-way and digging up streets to lay wire. We
believe that our systems are more cost-effective than other wireless access
systems because our IP-based systems reduce equipment costs and allow for ease
of operation as the broadband wireless market increasingly adopts IP as an
industry standard. Our systems use our enhanced version of the cable industry's
DOCSIS standard, which also contributes to the cost-effectiveness of our
systems.

    DOCSIS-BASED SYSTEMS.  We have adapted the DOCSIS standard for use in the
wireless environment. Because different manufacturers may use different
protocols and interfaces for their products, these products are often unable to
communicate with one another. By designing DOCSIS-based systems that can be
easily adapted to new standards and protocols, our systems limit
interoperability obstacles. Widely-available key components make our
DOCSIS-based systems less expensive to deploy than most other currently
available systems.

    COMMERCIAL DEPLOYMENTS.  Our product is one of the first commercially
available wireless hub and modem systems for the MMDS and LMDS frequency bands.
Our systems have been commercially deployed at 21 domestic and international
sites.

    FLEXIBLE PLATFORM.  Our systems are highly scalable, allowing our customers
to establish a wireless broadband access network with a relatively low initial
investment and later expand coverage and increase capacity of the network as
subscriber demand increases. Our integrated network management system is
designed to allow upgrades to system functionality without costly replacements
of existing hardware. Service providers also use the integrated network
management system to dynamically optimize system resources by efficiently
allocating bandwidth, which enables them to maximize the number of simultaneous
end-users served by a hub while preserving the speed and quality of data
transmission.

STRATEGY

    Our objective is to be the leading worldwide supplier to service providers
and system integrators of broadband wireless access systems deployed in
point-to-multipoint applications. Our strategy to accomplish this objective is
to:

    - CAPITALIZE ON EARLY ACCEPTANCE OF OUR SYSTEMS. We intend to use the early
      acceptance of our systems to demonstrate our capabilities to potential
      customers as we seek to expand our customer base.

    - BROADEN OUR PRODUCT OFFERINGS. We intend to develop enhanced products and
      new systems to address additional frequency bands worldwide as they become
      available. We expect to utilize our flexible system architecture to
      operate in additional frequency bands with relatively minor modifications
      in transmission components and without having to redesign our entire
      system architecture.

    - IMPROVE COST-EFFECTIVENESS AND PERFORMANCE. We intend to continue
      improving the performance and quality of our systems, while reducing costs
      by integrating advanced components. We are developing additional
      algorithms to enhance system functionality and allocate frequencies more
      efficiently.

                                       31

    - LEVERAGE KEY STRATEGIC RELATIONSHIPS.We have established strategic
      relationships with several service providers and system integrators. We
      expect to strengthen our existing relationships and establish new
      relationships with other system integrators and service providers, to
      increase product distribution and expand into additional geographic
      markets.

    - PARTICIPATE IN DEVELOPING INDUSTRY STANDARDS. We expect that our
      technological expertise will allow us to play an integral role in the
      development of the wireless DOCSIS standard. In this regard, we are
      participating in the Institute of Electrical and Electronic Engineers, or
      IEEE, subcommittee to develop wireless industry standards.

PRODUCTS

    Our systems are deployed in point-to-multipoint applications at the
frequencies licensed for these applications. Our system is comprised of wireless
hubs and wireless subscriber modems.

    The following diagram depicts our broadband wireless access system:

                                   [GRAPHIC]

    - Point-to-multipoint wireless hubs are located in base stations and send
      and receive data traffic to and from up to 8,000 wireless subscriber
      modems at very high speeds. Our network management system manages and
      controls the traffic transmitted over our broadband wireless system.

    - Our wireless modems connected to PCs or LANs are located in residences,
      small/home offices, and medium-sized businesses. These modems send and
      receive data traffic and provide access to the Internet.

    - Our wireless hub interfaces with a router located in the base station that
      sends data traffic to the Internet and, in the future, voice traffic to
      the gateway that connects with the public telephone network.

    - System integrators or service providers add additional network equipment,
      such as antennae to transmit wireless radio frequency signals, and
      complete the network infrastructure.

                                       32

    WIRELESS HUB.  Our wireless hub manages data communications between wireless
modems located at subscribers' locations and network devices such as routers
located at a central office or base station. The primary role of the wireless
hub is to manage the upstream traffic from the subscriber toward the public
telephone and data networks, and the downstream traffic from the networks toward
the subscriber. Our wireless hub can support up to 8,000 wireless modems.

    Our wireless hub employs a unique open physical layer architecture that is
designed to support future upgrades when more advanced physical layer devices
become commercially available. Our wireless hub is designed to support a variety
of channel capacities by utilizing any combination of six upstream system
modules and four downstream system modules. For example, our system can provide,
among other combinations, 60 upstream channels and 8 downstream channels or 48
upstream channels and 16 downstream channels. A channel is a subdivision of a
frequency band used for the transmission of radio frequency signals. This
flexibility allows the system engineer to configure a system for each specific
situation. Several frequency bands may be used within the same wireless hub.

    Our wireless hub is a carrier-class system that may be accessed for
modification or system module replacement by the operator while maintaining
continuous operation. Most of the modules are identical, which is intended to
reduce maintenance and inventory requirements. When used in combination with our
wireless modems, our wireless hub enables radio frequency performance in any of
the currently licensed point-to-multipoint frequency bands. This is
accomplished, in part, by permitting the system operator to establish upstream
sub-channels and downstream channels with various signal modulation techniques.
Multiple wireless hubs may be controlled through the same network management
system operator interface, either locally or from a remote location.

    Our integrated network management system is a Windows NT-based software
package that manages overall system performance. The system features graphical
views of all network elements, subscribers, modems and traffic patterns. The
network management system allows network operators to configure, maintain and
troubleshoot hubs and modems from a central workstation. Our network management
system also enables the network operator to work at a location remote from the
public telephone network or the data network, thereby increasing the system's
operational flexibility. In addition, our systems can adjust real-time system
parameters to more optimally utilize bandwidth resources. This utilization
translates into increased potential revenue per channel for service providers as
compared to other currently available wireless products.

    WIRELESS MODEM.  Our wireless modem is suitable for residential, home office
or small office deployment. It supports up to 16 individual users simultaneously
through a separate Ethernet hub or switch. Radio frequency performance is
enhanced through a combination of flexible modulation and data rates.

    We introduced our first generation broadband wireless access system during
the third quarter of 1998, for the LMDS frequency band, and during the first
quarter of 1999, for the MMDS frequency band. We introduced our second
generation broadband wireless access system during the fourth quarter of 1999,
for the MMDS and LMDS frequency bands. Our systems have been commercially
deployed at 21 domestic and international sites.

    Our first generation and second generation systems utilize an IP-based
point-to-multipoint architecture and incorporate time division multiplexing, or
TDM, in the downstream channel and time division multiple access, or TDMA, in
the upstream channel. Our second generation systems use an enhanced version of
DOCSIS, the cable industry standard for IP-based point-to-multipoint
communication systems. Because DOCSIS was designed for cable systems, it is
inadequate to address some unique characteristics of the wireless environment.
We have adapted the DOCSIS standard to suit the wireless environment. Our
wireless enhancements to DOCSIS, which we refer to as DOCSIS(+), allow operation
over a wide range of frequencies. Currently, the primary frequency bands for

                                       33

broadband data services in the United States or other countries are various
frequencies within these bands:

    - WCS--Wireless Communications Service--2.305 to 2.320 GHz and 2.345 to
      2.360 GHz;

    - MMDS--Multipoint Multichannel Distribution Service--2.150 to 2.680 GHz;
      and

    - LMDS--Local Multipoint Distribution Service--24 to 40 GHz.

    Product revenues recognized in 1999 relate to sales of cable and wireless
modem products. All of our product revenues in 1998 and 1997 relate to sales of
cable modem products that we are no longer developing. We do not anticipate
recognizing material amounts of revenue from cable modem products in subsequent
periods. Accordingly, the success of our business will be entirely dependent
upon the success of our wireless products described above.

TECHNOLOGY

    Our experience in designing shared bandwidth communications systems using
TDMA technology is the foundation of our expertise in the point-to-multipoint
broadband wireless access market. We believe that we have extensive expertise in
system-level design, as well as modem and broadband radio frequency technology.
We have developed media access controller, or MAC, layer algorithms that
maximize channel utilization to allow multiple subscribers to share a single
upstream channel.

    INTERNET PROTOCOL EXPERTISE.  Our system architecture is IP-based to support
IP communications traffic, and our primary systems component, the MAC, is
optimized for IP communications traffic. We have designed our systems to best
support variable-length IP packets, including the most common packet size of 64
bytes. In addition, we are proficient in IP networking technology, including
network interfaces.

    DOCSIS(+) STANDARD.  Our current generation systems are based on the cable
industry's DOCSIS standard that we have adapted and enhanced for use in the
wireless environment. This DOCSIS(+) standard provides for comprehensive support
of all IP-based services, including encryption, bandwidth allocation and
management and multicast. We believe that we are the first company to modify the
DOCSIS standard to suit the wireless environment. We have developed MAC layer
algorithms based on DOCSIS(+) for our wireless hubs and modems and have made
additional enhancements to facilitate reliable communication over the MMDS and
LMDS frequency bands.

    ENHANCED MAC LAYER ALGORITHMS.  Our enhanced MAC layer algorithms, combined
with select physical layer algorithms, provide robust performance under adverse
conditions and effectively utilize the limited frequency and bandwidth
allocations of the MMDS band.

    SIGNAL PROCESSING TECHNOLOGY.  We develop, deploy and support the networking
architecture for the multiple modules required in our systems. Specifically, we
have developed forward error correction and encryption that optimally integrate
into our systems. We believe that our ability to rapidly develop and integrate
such modules provides us with a competitive advantage.

    SCHEDULING ALGORITHMS.  We develop scheduling algorithms for TDMA-based
point-to-multipoint systems. Our network management system is designed to
predict user behavior and more efficiently utilize scarce bandwidth resources.
The ability to control and modify the characteristics of the network management
system allows us to further optimize them for changing environments and future
services.

CUSTOMERS

    We sell our systems directly to service providers and system integrators
that deploy our systems as part of their end-to-end network solutions for
service providers. We also provide system integration services to some of our
service provider customers to more effectively implement our systems. We sell

                                       34

our systems based on individual purchase orders. Our customers are not obligated
by long-term contracts to purchase our systems. Our customers can generally
cancel or reschedule orders upon short notice and can discontinue using our
systems at any time.

    A relatively small number of customers account for a large percentage of our
revenues. In 1999, ADC Telecommunications accounted for approximately 20% of our
revenues, Aster City Cable accounted for approximately 14% of our revenues,
Shanghai Bell accounted for approximately 13% of our revenues and Philips
Semiconductor accounted for approximately 12% of our revenues.

    COLLABORATION AGREEMENT.  In August 1999, we entered into a collaboration
agreement with ADC Telecommunications, under which we agreed to sell our hubs
and modems to ADC for resale and distribution to ADC's customers at a market
price to be established by good faith negotiation between ADC and us. Under this
agreement, ADC has the exclusive right to market, sell and distribute our
products to MCI Worldcom, Sprint, BellSouth, Wireless One and Irish Multi
Channel. We also agreed to grant to ADC a non-exclusive license to use specified
software embedded in or provided with our products.

    In connection with the collaboration agreement, ADC made an approximately
10% equity investment in Vyyo. Additional information regarding ADC's investment
is contained in this prospectus under the heading "Certain Relationships and
Related Transactions."

    LICENSE AND DEVELOPMENT AGREEMENT.  In December 1999, we entered into a
license and development agreement with Philips Semiconductor, relating to cable
modem systems. Under this contract, we agreed to license two versions of our
DOCSIS MAC system to Philips. We have given Philips a non-exclusive,
royalty-free right to use our DOCSIS 1.0 MAC in exchange for a one-time license
fee. In addition, we have given Philips a non-exclusive, royalty-bearing right
to use our DOCSIS 1.1 MAC in exchange for a license fee, a percentage of which
is paid upon the achievement of specified milestones related to the development
of the DOCSIS 1.1 MAC.

SALES AND MARKETING

    The global telecommunications industry is dominated by a limited number of
network system integrators. We focus our marketing efforts on network system
integrators that have the means to provide vendor financing in situations where
our equipment is purchased as part of the total network. For some service
providers, this financing is a necessary part of the total network solution. We
support our system integrator customers with site demonstrations for their
service provider customers. The objective of a site demonstration is to promote
the adoption of our systems for deployment within the service provider's
network.

    We also sell our systems directly to service providers. In determining which
accounts to service directly, we focus on those service providers that prefer to
work with a vendor directly and serve as their own system integrator. In some
instances, we may serve as a system integrator and provide, through third
parties, the other components of the network system.

    Our direct sales force maintains contact with the service provider and the
system integrator account team, regardless of the actual distribution channel.
This contact keeps us informed of the evolving needs of the service providers
and helps strengthen our relationship with each customer. In some markets, we
have established distribution relationships with local resellers that also
provide support and maintenance to their service provider customers.

    Our marketing group provides marketing support services for our executive
staff, direct sales force, system integrators and resellers. Through our
marketing activities, we provide technical and strategic sales support to our
direct sales personnel and system integrators or resellers, including in-depth
product presentations, technical manuals, sales tools, pricing, marketing
communications, marketing research, trademark administration and other support
functions.

                                       35

    Our marketing group is also responsible for product management activities
throughout each product's lifecycle. These activities include the definition of
product features, approval of product releases, specification of enhancements to
our product and service offerings, and determination of future product
platforms.

MANUFACTURING

    We outsource manufacturing to contract manufacturers that have the expertise
and ability to reduce costs associated with volume manufacturing and to respond
quickly to customer orders while maintaining high quality standards. We
outsource printed circuit board assembly and manufacturing of our wireless hubs
to contract manufacturers located in Israel. We outsource manufacturing of our
wireless modems to a contract manufacturer located in Taiwan. Any inability of
these manufacturers to provide the necessary capacity or output could result in
significant production delays which could harm our business. Our wireless hubs
and modems are currently purchased on a purchase order basis. We have no
guaranteed supply or long-term contractual agreements with any of our suppliers.
In addition, some of the components included in our systems are obtained from a
single source or limited group of suppliers. The partial or complete loss of
such suppliers could increase our costs, delay shipments or require redesigns of
our products.

    We assemble our wireless hubs and perform final tests on our systems at our
facility located in Jerusalem, Israel. Our facility is ISO 9002-certified. ISO
9002 is a set of international quality assurance standards for companies
involved in the design, development, manufacturing, installation and servicing
of products or services. These standards are set by the International
Organization for Standardization, or ISO, an international federation of
national standards bodies. To be recommended for ISO 9002 certification, a
company must be audited by an ISO-accredited auditing company and must meet or
surpass ISO standards.

RESEARCH AND DEVELOPMENT

    The goal of our research and development activities is to continue the
development and introduction of next-generation products for our customers. Our
efforts are also focused on reducing the cost and increasing the functionality
of our systems, while adapting them to the frequency and interface
specifications required for new markets. Our ongoing new product development
program assesses service providers' needs and technological changes in the
communications market. We are pursuing new generations of many of our products,
including our second generation system for MMDS frequencies, our second
generation system for LMDS frequencies and high-capacity, third generation
wireless hubs for LMDS frequencies.

    We believe that our extensive experience designing and implementing high
quality network and radio components and system software allows us to develop
high-value integrated systems solutions. As a result of these development
efforts, we believe that we have created an industry-leading platform for
cost-effective broadband wireless voice and data delivery with dynamic bandwidth
allocation.

    Our future success depends on our continued investment in research and
development in radio, networking and software technologies, and we expect to
continue to invest a significant portion of revenues in this area. Our research
and development expenditures were $2.4 million for 1997, $3.3 million for 1998
and $3.7 million for 1999. We are currently investing significant resources to
enhance our network management system software, integrate base station
components and extend the capabilities, frequencies and transmission capacity of
our systems.

    As of December 31, 1999, our research and development staff consisted of 53
employees, all of whom are located in Israel.

                                       36

COMPETITION

    The market for broadband access systems is intensely competitive, rapidly
evolving and subject to rapid technological change. The principal competitive
factors in this market include:

    - product performance and features;

    - price of competitive products;

    - reliability and stability of operation;

    - ability to develop and implement new services and technologies;

    - ability to support newly allocated frequencies; and

    - sales capability, technical support and service.

    Many of our competitors and potential competitors have substantially greater
financial, technical, distribution, marketing and other resources than we have
and, therefore, may be able to respond more quickly to new or changing
opportunities, technologies and other developments. In addition, many of our
competitors have longer operating histories, greater name recognition and
established relationships with system integrators and service providers. These
competitors may also be able to undertake more extensive marketing campaigns,
adopt more aggressive pricing policies and decote substantially more resources
to developing new products. Our primary competitor is Hybrid Networks, Inc. In
addition, well-capitalized companies such as Cisco Systems, Lucent Technologies,
Nortel Networks, Newbridge Networks and other vendors have announced plans to
enter, or are potential entrants into, the broadband wireless market. These
vendors have been attracted byrecent investments by MCI WorldCom, Sprint and
other service providers in wireless operations. Most of these competitors have
existing relationships with one or more of our prospective customers.

    We also face competition from technologies such as digital subscriber line,
fiber, cable, satellite and point-to-point wireless. We may not be able to
compete successfully against our current and future competitors and competitive
pressures may seriously harm our business.

GOVERNMENT REGULATION

    Our business is premised on the availability of certain radio frequencies
for broadband two-way communications. Radio frequencies are subject to extensive
regulation under the laws of the United States, foreign laws and international
treaties. Each country has different regulation and regulatory processes for
wireless communications equipment and uses of radio frequencies. The regulatory
environment in which we operate is subject to significant change, the results
and timing of which are uncertain. Historically, in many countries the
unavailability of radio frequencies for two-way broadband communications has
inhibited the growth of such networks. The process of establishing new
regulations for broadband wireless frequencies and allocating such frequencies
to operators is complex and lengthy. Our customers and potential customers may
not be able to obtain sufficient frequencies for their planned uses of our
systems. Failure by the regulatory authorities to allocate suitable, sufficient
radio frequencies for such uses in a timely manner could deter potential
customers from ordering our systems and seriously harm our business.

    Our systems must conform to a variety of domestic, foreign and international
regulatory requirements established to, among other things, avoid interference
among users of radio frequencies and permit interconnection of equipment.
Regulatory bodies worldwide have adopted and are adopting or revising standards
for wireless communications products. The emergence or evolution of regulations
and industry standards for broadband wireless products, through official
standards committees or widespread use by operators, could require us to modify
our systems, which may be expensive and time-consuming, and incur substantial
compliance costs and seriously harm our business.

                                       37

    We are subject to export control laws and regulations with respect to all or
our products and technology. We are subject to the risk that more stringent
export control requirements could be imposed in the future on product classes
that include products exported by us, which would result in additional
compliance burdens and could impair the enforceability of our contract rights.
Some of our products contain encryption technologies to enable the transfer of
data in a manner that preserves the privacy of the parties communicating such
data. United States law requires that we obtain an export license for our
systems and that we comply with various restrictions on exporting our systems to
certain countries. Our United Stated license expires October 31, 2000. We expect
that we will be able to do so. In addition, we may be required to apply for
additional licenses to cover modifications and enhancements to our products. Any
revocation or expiration of any requisite license, the failure to obtain a
license for product modifications, or more stringent export control requirements
could seriously harm our business.

INTELLECTUAL PROPERTY

    We have 16 patent applications pending in the United States. We rely on a
combination of patent, copyright and trademark laws, trade secrets and
confidentiality and other contractual provisions to establish and protect our
proprietary rights, each of which are important to our business.

    Our success depends in part on our ability to protect our proprietary
technologies. Our pending or future patent applications may not be approved and
the claims covered by such applications may be reduced. If allowed, our patents
may not be of sufficient scope or strength, others may independently develop
similar technologies or products, duplicate any of our products or design around
our patents, and the patents may not provide us competitive advantages. Further,
patents held by third parties may not prevent the commercialization of products
incorporating our technologies or third parties may challenge or seek to narrow,
invalidate or circumvent any of our pending or future patents. We also believe
that foreign patents, if obtained, and the protection afforded by such foreign
patents and foreign intellectual property laws, may be more limited than that
provided under United States patents and intellectual property laws. Litigation,
which could result in substantial costs and diversion of effort by us, may also
be necessary to enforce any patents issued or licensed to us or to determine the
scope and validity of third-party proprietary rights. Any such litigation,
regardless of outcome, could be expensive and time-consuming, and adverse
determinations in any such litigation could seriously harm our business.

    We also rely on unpatented trade secrets and know-how and proprietary
technological innovation and expertise which are protected in part by
confidentiality and invention assignment agreements with our employees, advisors
and consultants [and non-disclosure agreements with certain of our suppliers and
distributors.] These agreements may be breached, we may not have adequate
remedies for any breach or our unpatented proprietary intellectual property may
otherwise become known or independently discovered by competitors. Further, the
laws of certain foreign countries may not protect our products or intellectual
property rights to the same extent as do the laws of the United States.

    From time to time, third parties, including our competitors, may assert
patent, copyright and other intellectual property rights to technologies that
are important to us. We expect that we will increasingly be subject to license
offers and infringement claims as the number of products and competitors in our
market grows and the functionality of products overlaps. In this regard, in
early 1999, we received a written notice from Hybrid Networks in which Hybrid
claimed to have patent rights in certain technology. Hybrid requested that we
review our products in light of six of Hybrid's issued patents.

    We are investigating Hybrid's claims and we currently believe the patents
are invalid or are not infringed by our products. However, others patents,
including Hybrid's, may be determined to be valid, or some or all of our
products may ultimately be determined to infringe the Hybrid patents or those of
other companies. Hybrid or other companies may pursue litigation with respect to
these or other

                                       38

claims. The results of any litigation are inherently uncertain. In the event of
an adverse result in any litigation with respect to intellectual property rights
relevant to our products that could arise in the future, we could be required to
obtain licenses to the infringing technology, pay substantial damages under
applicable law, to cease the manufacture, use and sale of infringing products or
to expend significant resources to develop non-infringing technology. Licenses
may not be available from third parties, including Hybrid, either on
commercially reasonable terms or at all. In addition, litigation frequently
involves substantial expenditures and can require significant management
attention, even if we ultimately prevail. Accordingly, any infringement claim or
litigation against us could significantly harm our business, operating results
and financial condition.

EMPLOYEES

    As of December 31, 1999, we had 98 full-time employees, of whom 15 were
employed in the United States and 83 were employed in Israel. Of these full-time
employees, 53 were principally dedicated to research and development, 11 were
dedicated to sales, marketing and customer support and 24 were involved in
manufacturing and operations. None of our U.S. employees is represented by a
union.

    Our Israeli subsidiary is subject to Israeli labor laws and regulations with
respect to our Israeli employees. These laws principally concern matters such as
paid annual vacation, paid sick days length of work day and work week, minimum
wages, pay for overtime, insurance for work related accidents, severance pay and
other conditions of employment.

    Our Israeli subsidiary and our Israeli employees are subject to provisions
of the collective bargaining agreements between the Histadrut, the General
Federation of Labor in Israel, and the Coordination Bureau of Economic
Organizations, including the Industrialists Associations, by order of the
Israeli Ministry of Labor and Welfare. These provisions principally concern cost
of living expenses, recreation pay and other conditions of employment. Our
Israeli subsidiary provides our Israeli employees with benefits and working
conditions above the required minimums. Our employees are not represented by a
labor union. We have not experienced any work stoppages.

FACILITIES

    We are headquartered in Cupertino, California, where we lease approximately
9,000 square feet of commercial space under a month-to-month sublease. These
facilities are used for executive office space, including sales and marketing
and finance and administration. We also lease approximately 27,000 square feet
of commercial space in Jerusalem, Israel under a term lease that expires on
December 31, 2003, subject to one five-year extension at our option. These
facilities are used for research and development activities and for product
assembly and testing.

LEGAL PROCEEDINGS

    We may from time to time become a party to various legal proceedings arising
in the ordinary course of our business. However, we are not currently a party to
any material legal proceedings.

                                       39

                                   MANAGEMENT

EXECUTIVE OFFICERS AND DIRECTORS

    The following table sets forth information regarding the executive officers
and directors of Vyyo as of December 31, 1999:



NAME                                          AGE                       POSITION
- ------------------------------------------  --------   ------------------------------------------
                                                 
Davidi Gilo...............................     43      Chairman of the Board and Chief Executive
                                                       Officer
Michael Corwin............................     43      Chief Operating Officer
Eran Pilovsky.............................     38      Vice President, Finance and Chief
                                                       Financial Officer
Arnon Kohavi..............................     35      Senior Vice President, Strategic Relations
Menashe Shahar............................     49      Vice President, Engineering and Chief
                                                       Technical Officer
Stephen P. Pezzola........................     43      General Counsel and Secretary
Lewis S. Broad............................     42      Director
Neill H. Brownstein.......................     55      Director
Avraham Fischer...........................     43      Director
John P. Griffin...........................     49      Director
Samuel L. Kaplan..........................     63      Director
Alan L. Zimmerman.........................     57      Director


    DAVIDI GILO has served as Vyyo's Chairman of the Board of Directors since
its inception in 1996. Mr. Gilo was appointed as Chief Executive Officer of Vyyo
in April 1999. From October 1998 until November 1999, Mr. Gilo also served as
Chairman of the Board of DSP Communications, Inc., a developer of chip sets for
wireless personal communications applications, and from June 1999 until
November 1999, he served as DSP Communications' Chief Executive Officer.
Mr. Gilo also served as the Chairman of the Board of DSP Communications from its
founding in 1987 through November 1997. Since 1996, Mr. Gilo has also been the
manager of the Gilo Group, LLC, an investment company he founded in 1996.
Between 1987 and 1993 he was the President and Chief Executive Officer of
DSP Group, Inc., a developer of telephony and speech compression components, and
he served as Chairman of the Board of DSP Group from 1987 until April 1995.

    MICHAEL CORWIN was appointed as Chief Operating Officer of Vyyo in
August 1999. From August 1995 until August 1999, Mr. Corwin served as Vice
President, Operations of Harmony Management, Inc., a private investment company.
From June 1994 until August 1995, he served as Vice President of Operations of
Nogatech, Inc., a consumer electronics company, and from 1986 until 1994, he was
Vice President of Purchasing and Production of DSP Group.

    ERAN PILOVSKY joined Vyyo as Vice President, Finance and Chief Financial
Officer in January 2000. Prior to joining Vyyo, Mr. Pilovsky spent over
14 years in various positions with Ernst & Young LLP's advisory and assurance
business service group, and became a partner at Ernst & Young in October 1997.
Mr. Pilovsky is a certified public accountant in California.

    ARNON KOHAVI joined Vyyo in November 1999 as Senior Vice President,
Strategic Relations. From July 1994 until October 1995, he served as Director of
Strategic Planning of DSP Communications, and from October 1995 until
January 1999, he was Vice President of Business Development of
DSP Communications. From January 1999 until November 1999 he served as Senior
Vice President, Strategic Relations of DSP Communications. From May 1994 until
July 1994, Mr. Kohavi was Manager of Business Development of DSP Group, Inc.

                                       40

    MENASHE SHAHAR has served as Vyyo's Vice President, Engineering since
July 1994 and as Chief Technical Officer since May 1999. Prior to joining Vyyo,
Mr. Shahar served for three years as Chief Engineer for the Data Communications
Department of the Tadiran Network Division of Tadiran Telecommunications Group.
The Tadiran Data Communication Department was a supplier and integrator of
packet switched, frame relay and data multiplexer equipment and systems. Tadiran
was a distributor of Sprint International and Newbridge Networks equipment in
Israel.

    STEPHEN P. PEZZOLA joined Vyyo in September 1996 as General Counsel and
Secretary. From September 1996 until November 1999, Mr. Pezzola also served as
General Counsel and Corporate Secretary of DSP Communications. Since
September 1996, Mr. Pezzola has also been a member of Gilo Group. Since
September 1996, he has also served as General Counsel and Secretary of Zen
Research, N.V., until January 2000, when he became Chairman of the Board. From
May 1986 until September 1996, Mr. Pezzola was a founding shareholder and
president of the law firm of Pezzola & Reinke, APC, of Oakland, California.

    LEWIS S. BROAD has been a member of the board of directors since
November 1999. Mr. Broad is a private investor. He is also a member of the board
of directors of Carrier Services, Inc., a company specializing in payment
processing and fraud prevention for telephone and Internet transactions. From
November 1994 until November 1999, Mr. Broad also served as a director of DSP
Communications.

    NEILL H. BROWNSTEIN was appointed as a member of the board of directors in
January 2000. Mr. Brownstein is President of Neill H. Brownstein Corporation, a
strategic investment management consulting firm which he founded in 1976. From
June 1970 to January 1995, Mr. Brownstein was associated with Bessemer
Securities Corporation and Bessemer Venture Partners, and during that period he
served as a founding general partner of three affiliated venture capital funds.
Mr. Brownstein also serves on the board of directors of Giga Information Group.
From November 1994 until November 1999, Mr. Brownstein also served as a director
of DSP Communications.

    AVRAHAM FISCHER, has been a member of the board of directors since April
1996. Mr. Fischer is a managing partner in the law firm of Fischer, Behar & Co.,
of Tel Aviv, Israel, where he has served since 1982. Since January 1998, Mr.
Fischer has served as co-chairman of the Board of Isra-air Aviation and Tourism,
and, since January 1997, he has been co-chairman of the board of Ganden
Investment Ltd., an Israeli tourism company. From 1996 until November 1999,
Mr. Fischer also served as a director of DSP Communications.

    JOHN P. GRIFFIN has been a member of the board of directors since
November 1999. From September 1996 through April 1998, Mr. Griffin served as
Vice President of Marketing for the Network Services Division of ADC
Telecommunications. In April 1998, Mr. Griffin was appointed as General Manager
of the Loop Transport Division of ADC Telecommunications. In May 1999, he was
appointed President of the Broadband Wireless Group of ADC Telecommunications.
From March 1995 through September 1996, Mr. Griffin served as Vice President of
Marketing of RSI Systems, a manufacturer of desktop video conferencing
equipment. Prior to that, he served for 9 years with ADC Telecommunications, the
first year as Manager of Technical Support and the remaining 8 years in various
marketing positions.

    SAMUEL L. KAPLAN has been a member of the board of directors since July
1999. Mr. Kaplan has been a partner in the law firm of Kaplan, Strangis and
Kaplan, P.A. of Minneapolis, Minnesota, since October 1978. Mr. Kaplan also
serves as a director of USP Real Estate Investment Trust, a real estate
investment trust. From 1991 until June 1999, Mr. Kaplan also served as a
director of DSP Group.

    ALAN L. ZIMMERMAN has been a member of the board of directors since July
1999. Since November 1994, Mr. Zimmerman has served as President of Law Finance
Group, Inc., a provider of financing in connection with anticipated awards in
legal proceedings. From 1992 through

                                       41

December 1999, he was Vice President of Inheritance Funding Company, LLC, a
provider of financing to heirs in connection with anticipated inheritance
payments.

BOARD OF DIRECTORS

    Upon completion of this offering, our certificate of incorporation will
provide for a classified board of directors consisting of three classes of
directors, each serving staggered three-year terms. As a result, a portion of
our board of directors will be elected each year. Class I directors' terms will
expire at the annual meeting of stockholders to be held in 2001, Class II
directors' terms will expire at the annual meeting of stockholders to be held in
2002 and Class III directors' terms will expire at the annual meeting of
stockholders to be held in 2003. Messrs. Fischer, Gilo and Griffin have been
designated Class I directors, Messrs. Broad and Brownstein have been designated
Class II directors, and Messrs. Kaplan and Zimmerman have been designated
Class III directors. There are no family relationships among any of our
directors, officers or key employees.

BOARD COMMITTEES

    We have established an audit committee and a compensation committee. The
audit committee reviews our internal accounting procedures and considers and
reports to the board of directors with respect to other auditing and accounting
matters, including the selection of our independent auditors, the scope of
annual audits, fees to be paid to our independent auditors and the performance
of our independent auditors. The audit committee currently consists of
Messrs. Broad, Brownstein and Kaplan. The compensation committee reviews and
recommends to the board of directors the salaries, benefits and stock option
grants for all employees, consultants, directors and other individuals
compensated by us. The compensation committee also administers our stock option
and other employee benefit plans. The compensation committee currently consists
of Messrs. Broad and Zimmerman.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

    Prior to establishing the compensation committee, the board of directors as
a whole performed the functions delegated to the compensation committee. No
member of the board of directors or the compensation committee serves as a
member of the board of directors or compensation committee of any entity that
has one or more executive officers serving as a member of our board of directors
or compensation committee.

DIRECTOR COMPENSATION

    Directors serving on the board of directors do not currently receive any
compensation for serving on the board. Directors are reimbursed for their
out-of-pocket expenses incurred in attending board and committee meetings. In
addition, all directors are eligible to participate in our 2000 Employee and
Consultant Equity Incentive Plan.

    In December 1999, the board of directors granted options to purchase 10,000
shares of our common stock to each of Messrs. Broad and Brownstein and an option
to purchase 50,000 shares of our common stock to Mr. Fischer, in each case at an
exercise price of $1.25 per share.

    In June 1999, the board of directors granted an option to purchase 50,000
shares of our common stock to Mr. Zimmerman and an option to purchase 44,000
shares of our common stock to Mr. Fischer, in each case at an exercise price of
$0.75 per share. In February 2000, the board of directors granted an option to
purchase 15,000 shares of our common stock to each of Messrs. Broad, Brownstein,
Fischer, Griffin, Kaplan and Zimmerman at an exercise price of $6.20 per share.

                                       42

EXECUTIVE COMPENSATION

    The following table sets forth the compensation earned, awarded or paid for
services rendered to us in all capacities for the fiscal year ended
December 31, 1999, by our Chief Executive Officer, our former Chief Executive
Officer and our two next most highly compensated executive officers who earned
more than $100,000 in salary and bonus during the fiscal year ended
December 31, 1999. These executives are referred to collectively as the named
executive officers elsewhere in this prospectus.

                           SUMMARY COMPENSATION TABLE



                                             ANNUAL COMPENSATION                  LONG-TERM COMPENSATION
                                  -----------------------------------------   ------------------------------
                                                              ALL OTHER       SECURITIES
                                                                ANNUAL        UNDERLYING       ALL OTHER
NAME AND PRINCIPAL POSITION       SALARY ($)   BONUS ($)   COMPENSATION ($)   OPTIONS (#)   COMPENSATION ($)
- --------------------------------  ----------   ---------   ----------------   -----------   ----------------
                                                                             
Davidi Gilo.....................   $175,000(1)       --             --          650,000              --
  Chairman of the Board and
  Chief Executive Officer
Stephen P. Pezzola..............    140,000(2)       --             --          129,000              --
  General Counsel
Menashe Shahar..................    122,370     $20,420        $17,739(3)       170,000         $28,043(4)
  Vice President, Engineering
  and Chief Technical Officer
Shaul Berger(5).................     96,200          --             --               --              --
  Former Chief Executive Officer


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

(1) Mr. Gilo's salary for services performed in 1999 has been accrued, and is
    expected to be paid to Mr. Gilo in 2000.

(2) $52,500 of this amount was paid to Mr. Pezzola in 1999, and $87,500 has been
    accrued by Vyyo and is expected to be paid to Mr. Pezzola in 2000.

(3) Includes (i) $4,761 reimbursed to Mr. Shahar for taxes on a company
    automobile, (ii) $9,978 paid to Mr. Shahar for accrued but unused vacation
    time and (iii) $3,000 paid to Mr. Shahar for travel expenses incurred by
    Mr. Shahar's wife.

(4) Includes a total of $28,043 paid on behalf of Mr. Shahar to a severance
    fund, a pension fund and a risk/disability fund. The amounts held in such
    funds on Mr. Shahar's behalf are, generally, payable to him upon the
    termination of his employment with Vyyo.

(5) Mr. Berger resigned as Chief Executive Officer in April 1999.

                                       43

                       OPTION GRANTS IN LAST FISCAL YEAR

    The following table provides information concerning grants of options to
purchase our common stock made during the fiscal year ended December 31, 1999 to
the named executive officers.



                                                                                   POTENTIAL REALIZABLE VALUE
                             NUMBER OF      PERCENT OF                               AT ASSUMED ANNUAL RATES
                             SECURITIES   TOTAL OPTIONS                             OF STOCK APPRECIATION FOR
                             UNDERLYING   GRANTED DURING                                 OPTION TERM(3)
                              OPTIONS         FISCAL       EXERCISE   EXPIRATION   ---------------------------
NAME                         GRANTED(1)      1999(2)        PRICE        DATE         5%                10%
- ----                         ----------   --------------   --------   ----------   ---------         ---------
                                                                                   
Davidi Gilo................   390,000         12.38%        $0.75      06/01/04     $80,812          $178,574
                              260,000          8.25          1.25      11/24/04      89,791           198,415
Stephen P. Pezzola.........   129,000          4.10          0.75      06/01/04      26,730            59,067
Menashe Shahar.............   170,000          5.40          0.75      06/01/04      35,226            77,840
Shaul Berger...............        --            --            --            --          --                --


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

(1) All options were granted pursuant to the 1999 Employee and Consultant Equity
    Incentive Plan or the 2000 Employee and Consultant Equity Incentive Plan.

(2) Based on an aggregate of 3,150,700 options granted to employees, officers,
    directors and consultants in fiscal 1999.

(3) Based upon the exercise price, which was equal to or greater than the fair
    market value on the date of grant, and annual appreciation at the rate
    stated on such price through the expiration date of the options. Amounts
    represent hypothetical gains that could be achieved for the options if
    exercised at the end of the term. The assumed 5% and 10% rates of stock
    price appreciation are provided in accordance with the rules of the
    Securities and Exchange Commission and do not represent our estimate or
    projection of the future stock price. Actual gains, if any, are contingent
    upon the continued employment of the named executive officer through the
    expiration date, as well as being dependent upon the general performance of
    the common stock. The potential realizable values have not taken into
    account amounts required to be paid for federal income taxes.

                                       44

AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR END OPTION
VALUES

    The following table describes for the named executive officers the number
and amount of stock options exercised during fiscal 1999 and securities
underlying unexercised options held at December 31, 1999.



                                                            NUMBER OF SECURITIES
                                                           UNDERLYING UNEXERCISED                 VALUE OF UNEXERCISED
                                                                 OPTIONS AT                      IN-THE-MONEY OPTIONS AT
                          SHARES                              DECEMBER 31, 1999                     DECEMBER 31, 1999
                       ACQUIRED ON       VALUE       -----------------------------------   -----------------------------------
NAME                   EXERCISE (#)   REALIZED ($)   EXERCISABLE (#)   UNEXERCISABLE (#)   EXERCISABLE ($)   UNEXERCISABLE ($)
- ----                   ------------   ------------   ---------------   -----------------   ---------------   -----------------
                                                                                           
Davidi Gilo..........    390,000         195,000              --                 --                 --                 --

                         260,000              --

Stephen P. Pezzola...     80,000          40,000          49,000                 --             24,500                 --

                          31,000          23,250

Menashe Shahar.......         --              --          20,375            179,625             15,281             92,219

Shaul Berger.........     82,599          61,949              --                 --                 --                 --


    The value realized on exercised options and the value of unexercised
in-the-money options at December 31, 1999 is based on a value of $1.25 per
share, the fair market value of our common stock at December 31, 1999, as
determined by our board of directors, minus the per share exercise price,
multiplied by the number of shares underlying the options.

STOCK OPTION PLANS

    AMENDED AND RESTATED 2000 EMPLOYEE AND CONSULTANT EQUITY INCENTIVE
PLAN.  The 2000 Employee and Consultant Equity Incentive Plan, or 2000 Plan, was
adopted by our board of directors and approved by our stockholders on
November 22, 1999 for the benefit of our officers, directors, employees,
advisors and consultants and provides for the issuance of stock-based incentive
awards, including stock options, stock appreciation rights, limited stock
appreciation rights, restricted stock, deferred stock, and performance shares.
An award may consist of one arrangement or benefit or two or more of them in
tandem or in the alternative. Under the 2000 Plan, awards covering no more than
80% of the shares reserved for issuance under the plan may be granted to any
participant in any one year. An aggregate of 2,700,000 shares of common stock
was initially reserved for issuance under the 2000 Plan. On February 2, 2000 our
board of directors approved an amendment to the 2000 Plan to increase the total
number of shares reserved for issuance under the plan from 2,700,000 shares to
5,000,000 shares, plus an annual increase to be added automatically on the first
day of each fiscal year, commencing in 2001, equal to the lesser of
(1) 900,000 shares or (2) 5% of the number of outstanding shares on the last day
of the immediately preceding fiscal year. This amendment was approved by our
stockholders on February 2, 2000.

    Each of our non-employee directors elected to the board of directors for the
first time after February 2, 2000 will receive, upon such election, an initial
grant of options to purchase 50,000 shares of common stock at fair market value
on the date of grant. These options will have a 10-year term and will vest over
a four-year period. In addition, each of our non-employee directors will receive
an annual grant of options to purchase 15,000 shares for each year during such
director's term. These options will have a 10-year term and will vest
immediately upon the date of grant. The foregoing award of options will be
granted automatically under the 2000 Plan.

    The 2000 Plan will initially be administered by our board of directors,
although it may be administered by either our board of directors or any
committee of our board of directors, the board or committee is sometimes
referred to in this prospectus as the plan administrator. The plan administrator

                                       45

may interpret the 2000 Plan and may prescribe, amend and rescind rules and make
all other determinations necessary or desirable for the administration of the
2000 Plan. The 2000 Plan permits the plan administrator to select the officers,
directors, employees, advisors and consultants, including directors who are also
employees, who will receive awards and generally to determine the terms and
conditions of those awards.

    We may issue two types of stock options under the 2000 Plan: incentive stock
options which are intended to qualify under the Code, and non-qualified stock
options. The option price of each incentive stock option granted under the 2000
Plan must be at least equal to the fair market value of a share of common stock
on the date the incentive stock option is granted.

    Stock appreciation rights and limited stock appreciation rights may be
granted under the 2000 Plan either alone or in conjunction with all or part of
any stock option granted under the 2000 Plan. A stock appreciation right granted
under the 2000 Plan entitles its holder to receive, at the time of exercise, an
amount per share equal to the excess of the fair market value at the date of
exercise of a share of common stock over a specified price fixed by the plan
administrator. A limited stock appreciation right granted under the 2000 Plan
entitles its holder to receive, at the time of exercise, an amount per share
equal to the excess of the change in control price of a share of common stock
over a specified price fixed by the plan administrator. A limited stock
appreciation right may only be exercised within the 30-day period following a
change in control.

    Restricted stock, deferred stock and performance shares may be granted under
the 2000 Plan. The plan administrator will determine the purchase price,
performance period and performance goals, if any, with respect to the grant of
restricted stock, deferred stock and performance shares. Participants with
restricted stock and preferred shares generally have all of the rights of a
stockholder. With respect to deferred stock, during the deferral period, subject
to the terms and conditions imposed by the plan administrator, the deferred
stock units may be credited with dividend equivalent rights. If the performance
goals and other restrictions are not attained, the participant will forfeit his
or her shares of restricted stock, deferred stock and/or performance shares.

    In the event we merge or consolidate with another entity in which we are not
the surviving corporation, dissolve or liquidate or sell substantially all of
our assets, outstanding awards under the 2000 Plan may be assumed or replaced by
the successor corporation, if any, or its parent. If the successor corporation
or its parent does not assume outstanding awards or substitute equivalent
awards, such awards will automatically become fully vested and exercisable and
be released from any restrictions on transfer and repurchase or forfeiture
right.

    The terms of the 2000 Plan provide that the plan administrator may amend,
suspend or terminate the 2000 Plan at any time, provided, however, that some
amendments require approval of our stockholders. Further, no action may be taken
which adversely affects any rights under outstanding awards without the holder's
consent. The 2000 Plan will terminate in 2010.

    1999 EMPLOYEE AND CONSULTANT EQUITY INCENTIVE PLAN.  The 1999 Employee and
Consultant Equity Incentive Plan, or 1999 Plan, was adopted by our board of
directors on June 4, 1999 and approved by our stockholders on July 15, 1999 for
the benefit of our officers, directors, employees, advisors and consultants and
provides for the issuance of stock-based incentive awards, including stock
options, restricted stock and stock bonuses. An aggregate of 1,600,000 shares of
common stock has been reserved for issuance under the 1999 Plan. As of
December 31, 1999, options to purchase an aggregate of 854,000 shares of common
stock were outstanding under the 1999 Plan with a weighted-average exercise
price of $0.75. We will not be granting options pursuant to the 1999 Plan
following the offering. The 1999 Plan will automatically terminate in 2009.

    The 1999 Plan may be administered by our board of directors or committee of
the board. The board of directors or committee of the board may interpret the
1999 Plan and may prescribe, amend

                                       46

and rescind rules and make all other determinations necessary or desirable for
the administration of the 1999 Plan, except that some amendments require
stockholder approval. In addition, the board of directors or committee of the
board may not take any action which would harm the rights previously granted
under the 1999 Plan without the holders' consent.

    If we merge or consolidate with another entity or if we dissolve, liquidate
or sell substantially all of our assets, outstanding awards under the 1999 Plan
may be assumed or replaced by the successor corporation or its parent. If the
successor corporation or its parent does not assume outstanding awards or
substitute equivalent awards, the awards will terminate.

    1996 EQUITY INCENTIVE PLAN.  The 1996 Equity Incentive Plan, or 1996 Plan,
was adopted by our board of directors on March 25, 1996 and approved by our
stockholders on April 5, 1996 for the benefit of our officers, directors,
employees, advisors and consultants and provides for the issuance of stock-based
incentive awards, including stock options, restricted stock and stock bonuses.
An aggregate of 220,000 shares of common stock was initially reserved for
issuance under the 1996 Plan. On May 13, 1998, our board of directors adopted,
and on June 23, 1998 our stockholders approved, an amendment to the 1996 Plan to
increase the total number of shares reserved for issuance under the plan from
220,000 to 320,000 shares. As of December 31, 1999, options to purchase an
aggregate of 152,767 shares of common stock with a weighted-average exercise
price of $0.50 were outstanding under the 1996 Plan. We will not be granting
options pursuant to the 1996 Plan following the offering. The 1996 Plan will
automatically terminate in 2006.

    The 1996 Plan may be administered by our board of directors or a committee
of the board. The board of directors or committee of the board may interpret the
1996 Plan and may prescribe, amend and rescind rules and make all other
determinations necessary or desirable for the administration of the 1996 Plan,
except that some amendments require stockholder approval. In addition, the board
of directors or committee of the board may not take any action which would harm
the rights previously granted under the 1996 Plan without the holders' consent.

    If we merge or consolidate with another entity or if we dissolve, liquidate
or sell substantially all of our assets, outstanding awards under the 1996 Plan
may be assumed or replaced by the successor corporation or its parent. If the
successor corporation or its parent does not assume outstanding awards or
substitute equivalent awards, the awards will terminate.

2000 EMPLOYEE STOCK PURCHASE PLAN

    On February 2, 2000, the board of directors adopted and our stockholders
approved our 2000 Employee Stock Purchase Plan, or Purchase Plan, which allows
eligible employees to purchase our common stock at a discount from fair market
value. A total of 500,000 shares of our common stock, plus an annual increase to
be added automatically on the first day of our fiscal year, commencing in 2001,
equal to the lesser of (a) 200,000 shares or (b) 1% of the number of outstanding
shares on the last trading day of the immediately preceding fiscal year has been
reserved for issuance under the Purchase Plan.

    The Purchase Plan will be administered by our board of directors, or a
specifically designated committee of the board of directors, this board or
committee is sometimes referred to in this prospectus as the plan administrator.
The plan administrator may interpret the Purchase Plan and, subject to its
provisions, may prescribe, amend and rescind rules and make all other
determinations necessary or desirable for the administration of the Purchase
Plan.

    The Purchase Plan contains consecutive, overlapping 24-month offering
periods. Each offering period includes four purchase periods. The offering
periods generally commence on the first trading day on or after May 15 and
November 15 of each year and end on the last trading day on the date

                                       47

twenty-four months later; provided, however, that the first offering period
under the Purchase Plan will commence upon the completion of the offering and
end on the trading on or before May 14, 2002.

    Employees are eligible to participate if they are employed by us or any
participating subsidiary for at least 20 hours per week and more than five
months in any calendar year. However, an employee may not be granted the right
to purchase stock under the Purchase Plan if the employee (a) immediately after
the grant would own stock possessing 5% or more of the total combined voting
power or value of all classes of our capital stock, or (b) holds rights to
purchase stock under any of our employee stock purchase plans that together
accrue at a rate which exceeds $25,000 worth of stock for each calendar year.
The Purchase Plan permits each employee to purchase common stock through payroll
deductions of up to 15% of the employee's compensation. The maximum number of
shares an employee may purchase during a single offering period is 10,000
shares.

    Amounts deducted and accumulated by the employee are used to purchase shares
of common stock at the end of each purchase period. The price of the common
stock offered under the Purchase Plan is an amount equal to 85% of the lower of
the fair market value of the common stock at the beginning of each offering
period or at the end of each purchase period. In the event the fair market value
at the end of a purchase period is less than the fair market value at the
beginning of the corresponding offering period, the participants of the affected
offering period will be withdrawn from such offering period following exercise
of their options and automatically re-enrolled in a new offering period.
Employees may end their participation in the Purchase Plan at any time during an
offering period, in which event, any amounts withheld through payroll deductions
and not otherwise used to purchase shares will be returned to them.
Participation ends automatically upon termination of employment with us.

    Rights granted under the Purchase Plan are not transferable by an employee
other than by will or the laws of descent and distribution. The Purchase Plan
provides that, in the event of a merger, consolidation, reorganization,
recapitalization, stock dividend or other change in corporate structure
affecting the number of issued shares of our common stock, the plan
administrator will conclusively determine the appropriate equitable adjustments.
The Purchase Plan will terminate in 2010. Our board of directors has the
authority to amend or terminate the Purchase Plan, except that no amendment or
termination may adversely affect any outstanding rights under the Purchase Plan.

EMPLOYMENT AGREEMENTS

    We have entered into employment agreements with each of Messrs. Gilo,
Corwin, Pezzola and Pilovsky. Each of the agreements with Messrs. Gilo, Corwin
and Pezzola became effective on January 1, 2000, and provide for three-year
terms that will automatically renew for consecutive one-year extensions, unless
terminated by either party upon written notice. Mr. Pilovsky's agreement became
effective on January 16, 2000 and provides for a three-year term that will
automatically renew for consecutive one-year extensions, unless terminated by
either party upon written notice.

    Under Mr. Gilo's agreement, he is entitled to receive an annual base salary
equal to $350,000 and an annual bonus, payable according to the following
schedule: if we meet 80% of our annual business plan, Mr. Gilo's bonus payment
will be equal to 15% of his annual base salary; if we meet 100% of our annual
business plan, Mr. Gilo's bonus payment will be equal to 50% of his annual base
salary; and if we meet 120% of our plan, Mr. Gilo's bonus payment will be equal
to 90% of his annual base salary. In addition, Mr. Gilo will also be entitled to
a discretionary bonus, as determined by our board of directors or the
compensation committee. Mr Gilo is required to devote at least 30 hours per week
to the business of Vyyo under his employment agreement.

    If Mr. Gilo's employment is terminated by us without cause or, if after the
initial three year term, Mr. Gilo's employment is not renewed, he will be
entitled to a severance payment equal to the greater of (a) the full amount of
the compensation that he would have been paid under his employment

                                       48

agreement or (b) 18 months of his then-current base salary. If Mr. Gilo's
employment is terminated by us with cause, in exchange for a release of any
claims Mr. Gilo may have against us, he will be entitled to a severance payment
equal to three months of his then-current base salary. If Mr. Gilo terminates
his employment with us, he will be entitled to a severance payment equal to nine
months of his then-current base salary. Mr. Gilo will remain as a full-time
employee during any period he is receiving severance pay and his options will
continue to vest during that period.

    Under Mr. Corwin's agreement, he is entitled to receive an annual base
salary equal to $225,000 and an annual bonus, payable according to the following
schedule: if we meet 80% of our annual business plan, Mr. Corwin's bonus payment
will be equal to 15% of his annual base salary; if we meet 100% of our annual
business plan, Mr. Corwin's bonus payment will be equal to 50% of his annual
base salary, with the bonus pro rated if the plan is met between 80% and 100% or
between 100% and 120%; and if we meet 120% of our plan, Mr. Corwin's bonus
payment will be equal to 90% of his annual base salary. In addition, Mr. Corwin
will also be entitled to a discretionary bonus, as determined by our board of
directors or the compensation committee.

    If Mr. Corwin's employment is terminated by us without cause, he will be
entitled to a severance payment equal to the greater of (a) the full amount of
the compensation that he would have been paid under his employment agreement or
(b) six months of his then-current base salary. If Mr. Corwin's employment is
terminated by us with cause, in exchange for a release as to any and all claims
Mr. Corwin may have against us, he will be entitled to a severance payment equal
to three months of his then-current base salary. If Mr. Corwin terminates his
employment with us, he will be entitled to a severance payment equal to three
months of his then-current base salary. If after the initial three-year term,
Mr. Corwin's employment is not renewed, he will be entitled to a severance
payment equal to 18 months of his then current base salary in exchange for a
release of any claims he may have against us. Mr. Corwin will remain as a
full-time employee during any period he is receiving severance pay and his
options will continue to vest during that period.

    Under Mr. Pezzola's agreement, he is entitled to receive an annual base
salary equal to $202,500, a bonus in the amount of $25,000 upon the successful
completion of this offering and an annual bonus, payable according to the
following schedule: if we meet 80% of our annual business plan, Mr. Pezzola's
bonus payment will be equal to 15% of his annual base salary; if we meet 100% of
our annual business plan, Mr. Pezzola's bonus payment will be equal to 50% of
his annual base salary; and if we meet 120% of our plan, Mr. Pezzola's bonus
payment will be equal to 90% of his annual base salary, with the bonus pro rated
if the plan is met between 80% and 100% or between 100% and 120%. In addition,
Mr. Pezzola will also be entitled to a discretionary bonus, as determined by our
board of directors or the compensation committee. Mr. Pezzola is required to
devote at least 30 hours per week to the business of Vyyo under his employment
agreement.

    If Mr. Pezzola's employment is terminated by us without cause, he will be
entitled to a severance payment equal to the greater of (a) the full amount of
the compensation that he would have been paid under his employment agreement or
(b) nine months of his then-current base salary. If Mr. Pezzola's employment is
terminated by us with cause, in exchange for a release as to any and all claims
Mr. Pezzola may have against us, he will be entitled to a severance payment
equal to three months of his then-current base salary. If Mr. Pezzola terminates
his employment with us, he will be entitled to a severance payment equal to
three months of his then-current base salary. If after the initial three-year
term, Mr. Pezzola's employment is not renewed, he will be entitled to a
severance payment equal to nine months of his then current base salary in
exchange for a release of any claims he may have against us. Mr. Pezzola will
remain as a full-time employee during any period he is receiving severance pay
and his options will continue to vest during that period.

    Under Mr. Pilovsky's agreement, he is entitled to receive an annual base
salary equal to $250,000, and an annual bonus, payable according to the
following schedule: if we meet 80% of our annual

                                       49

business plan, Mr. Pilovsky's bonus payment will be equal to 15% of his annual
base salary; if we meet 100% of our annual business plan, Mr. Pilovsky's bonus
payment will be equal to 50% of his annual base salary; and if we meet 120% of
our plan, Mr. Pilovsky's bonus payment will be equal to 90% of his annual base
salary. In addition, Mr. Pilovsky will also be entitled to a discretionary
bonus, as determined by our board of directors or the compensation committee.

    If Mr. Pilovsky's employment is terminated by us without cause, he will be
entitled to a severance payment equal to the greater of (a) the full amount of
the compensation that he would have been paid under his employment agreement or
(b) six months of his then-current base salary. If Mr. Pilovsky's employment is
terminated by us with cause, in exchange for a release as to any and all claims
Mr. Pilovsky may have against us, he will be entitled to a severance payment
equal to three months of his then-current base salary, with the bonus prorated
if the plan is met between 80% and 100% or between 100% and 120%. If
Mr. Pilovsky terminates his employment with us, he will not be entitled to a
severance payment. If after the initial three-year term, Mr. Pilovsky's
employment is not renewed, he will be entitled to a severance payment equal to
six months of his then current base salary in exchange for a release of any
claims he may have against us. Mr. Pilovsky will remain as a full-time employee
during any period he is receiving severance pay and his options will continue to
vest during that period.

    We have also entered into an employment agreement with Mr. Kohavi. His
agreement became effective on November 22, 1999, and provides for an 18 month
term that will automatically renew for consecutive six-month extensions, unless
terminated by either party by written notice. Under Mr. Kohavi's agreement, he
is entitled to receive an annual base salary equal to $155,000 and an annual
bonus, payable according to the following schedule: if we meet 80% of our annual
business plan, Mr. Kohavi's bonus payment will be equal to 25% of his annual
base salary; if we meet 100% of our annual business plan, Mr. Kohavi's bonus
payment will be equal to 75% of his annual base salary; and if we meet 120% of
our plan, Mr. Kohavi's bonus payment will be equal to 125% of his annual base
salary, with the bonus prorated if the plan is met between 80% and 100% or
between 100% and 120%. In addition, Mr. Kohavi will also be entitled to
participate in each bonus plan adopted by our board of directors.

    If Mr. Kohavi's employment is terminated by us without cause, he will be
entitled to a severance payment equal to the lesser of (a) the full amount of
the compensation that he would have been paid under his employment agreement or
(b) six months of his then-current base salary. If after the initial 18-month
term, Mr. Kohavi's employment is not renewed, he will be entitled to a severance
payment equal to six months of his then current base salary in exchange for a
release of any claims he may have against us.

LIMITATION OF LIABILITY AND INDEMNIFICATION

    Upon completion of this offering, our certificate of incorporation will
limit the liability of our directors to the maximum extent permitted by Delaware
law. Delaware law provides that directors will not be personally liable for
monetary damages for breach of their fiduciary duties as directors, except
liability for:

    - any breach of their duty of loyalty to the corporation or its
      stockholders;

    - acts or omissions not in good faith or which involve intentional
      misconduct or a knowing violation of law;

    - unlawful payments of dividends or unlawful stock repurchases or
      redemptions; or

    - any transaction from which the director derived an improper personal
      benefit.

                                       50

This provision will have no effect on any non-monetary remedies that may be
available to us or our stockholders, nor will it relieve us or other officers or
directors from compliance with federal or state securities laws.

    Upon completion of this offering, our certificate of incorporation and
bylaws will also generally provide that we will indemnify, to the fullest extent
permitted by Section 145 of the Delaware General Corporation Law, any person who
was or is a party or is threatened to be made a party to any threatened, pending
or completed action, suit, investigation, administrative hearing or any other
proceeding by reason of the fact that he or she is or was a director or officer
of ours, or is or was serving at our request as a director, officer, employee or
agent of another entity, against expenses incurred by him or her in connection
with that proceeding. An officer or director will not be entitled to
indemnification by us if:

    - the officer or director did not act in good faith and in a manner
      reasonably believed to be in, or not opposed to, our best interests; or

    - with respect to any criminal action or proceeding, the officer or director
      had reasonable cause to believe his or her conduct was unlawful.

    In addition, we plan to enter into indemnification agreements with our
directors containing provisions which may require us, among other things, to
indemnify our directors against various liabilities that may arise by virtue of
their status or service as directors and to advance their expenses incurred as a
result of any proceeding against them as to which they could be indemnified.
Insofar as indemnification for liabilities arising under the Securities Act may
be permitted to directors, officers or persons controlling Vyyo pursuant to the
foregoing provisions or otherwise, Vyyo has been informed that in the opinion of
the Securities and Exchange Commission, such indemnification is against public
policy as expressed in the Securities Act and is therefore unenforceable.

    At the present time, there is no pending ligation or proceeding involving
any director, officer, employee or agent of Vyyo which indemnification will be
required or permitted. We are not aware of any threatened litigation or
proceeding which may result in a claim for such indemnification.

                                       51

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

    Since February 1, 1997, there has not been, nor is there currently proposed,
any transaction or series of similar transactions to which we were or are to be
a party in which the amount involved exceeds $60,000 and in which any director,
executive officer or holder of more than 5% of our common stock, or an immediate
family member of any of the foregoing, had or will have a direct or indirect
interest other than:

    - compensation arrangements, which are described where required under
      "Management," and

    - the transactions described below. All references to shares of common stock
      reflect our 1-for-5 reverse stock split effected on January 3, 2000.

  SALES OF STOCK

    On December 28, 1999, we sold 40,000 shares of common stock at a purchase
price of $1.25 per share in cash, to each of our directors, Lewis Broad, Neill
Brownstein, Avraham Fischer, Davidi Gilo, John Griffin, Samuel Kaplan and Alan
Zimmerman.

    On December 28, 1999, we sold 178,571 shares of Series C convertible
preferred stock, at a purchase price of $0.56 per share in cash, to Arnon
Kohavi, our Senior Vice President, Strategic Relations.

    On December 28, 1999, we sold 20,000 shares of common stock at $0.75 per
share to Avraham Fischer upon exercise of a warrant.

    On August 31, 1999, we sold 9,172,010 shares of Series C convertible
preferred stock at a purchase price of $0.54 per share in cash, to ADC
Telecommunications, Inc., a principal stockholder of Vyyo.

    On May 31, 1999, we sold 5,953,104 shares of common stock, at a purchase
price of $0.75 per share, to the Gilo Family Partnership, of which 1,953,104
shares were purchased in exchange for the cancellation of promissory notes
issued by us to the partnership, in the aggregate principal amount of $1,435,000
plus accrued interest, and 4,000,000 shares were purchased in exchange for the
issuance by the partnership of a promissory note in the principal amount of
$3,000,000. The note was due on the earlier of demand or April 22, 2000, and
bore interest at a rate of 9% per annum. The note was secured by the purchased
shares. The note was repaid in full and cancelled in February 2000.

    On May 31, 1999, we sold 33,334 shares of common stock, at a purchase price
of $0.75 per share in cash, to the Samuel Kaplan/Ralph Strangis Investment
Partnership, an affiliate of Samuel L. Kaplan.

    On December 1, 1998, we sold shares of Series B preferred stock, at a
purchase price of $1.00 per share in cash, to the following investors, among
others:



NAME                                                          NUMBER OF SHARES
- ----                                                          ----------------
                                                           
Gilo Family Partnership.....................................       50,000
Kaplan/ Strangis Investment Partnership.....................        7,632
Michael Corwin..............................................        8,104
Pezzola-Foster Trust........................................        4,000
Alan Zimmerman..............................................       12,000


    In connection with this offering, we issued warrants to purchase up to the
number of shares of common stock equal to the sum of the number of shares of
Series B preferred stock each of these investors purchased multiplied by 0.6.
These warrants have terminated in accordance with their terms.

                                       52

    In March and April 1997, we sold shares of common stock at a price of $2.45
per share in cash, and Series A preferred stock at a price of $8.77 in cash, to
the following persons.



NAME                             NUMBER OF COMMON SHARES   NUMBER OF PREFERRED SHARES
- ----                             -----------------------   --------------------------
                                                     
The Davidi and Shamaya Gilo
  Trust........................           1,037                       2,593
Pezzola-Foster Trust...........           1,000                       2,500
PhaseCom Investor Group Limited
  Partnership No. 2............          53,166                     132,913
Avraham Fischer................           1,500                       3,750


  CONVERTIBLE NOTE AND WARRANT FINANCINGS

    On June 30, 1998, we issued unsecured promissory notes, which were
convertible into shares of common stock, and warrants to purchase common stock,
to the following investors, among others. The notes were due on June 30, 1999
and bore interest at a rate of 8% per annum. The notes were convertible into
shares of common stock at a conversion price equal to $7.50 if the note
converted before September 15, 1998, or if converted after September 15, 1998,
the greater of $7.50 or one third of the per share price of our common stock
resulting from either an initial public offering of our common stock or a merger
with another entity. In July 1999, we amended these notes so that they became
convertible into common stock at $1.25 per share. The warrants were originally
convertible into the number of shares of common stock equal to the sum of the
principal amount of the noteholder's note that we issued to it on June 30, 1998
multiplied by .35 divided by the conversion price of the note. In
November 1999, the warrants were amended to fix the exercise price at $7.50 per
share and to fix the number of shares for which the warrants were exercisable
into the number of shares set forth below. In December 1999, the warrants were
amended to reduce the exercise price to $2.80 per share.

    In consideration for the note issued to the Gilo Family Partnership, the
Partnership paid us $500,000 in cash, and we canceled the promissory notes dated
September 30, 1997, April 3, 1998 and May 8, 1998 in the aggregate principal
amount of $1,799,117, previously issued by us to the Partnership.



NAME                                                        PRINCIPAL AMOUNT OF NOTE   WARRANT SHARES
- ----                                                        ------------------------   --------------
                                                                                 
Gilo Family Partnership...................................         $2,875,556              134,193
Samuel Kaplan/Ralph Strangis Investment Partnership.......         $   34,201                1,596
Alan Zimmerman............................................         $   26,052                1,216
Michael Corwin............................................         $   36,772                1,716
Pezzola-Foster Trust......................................         $   15,000                  700
Avraham Fischer...........................................         $   21,723                1,014


    In November 1999, all of these notes were converted into an aggregate of
2,407,441 shares of common stock at a conversion rate of $1.25 per share. In
December 1999, all of these warrants were exercised for a total of 140,434
shares of common stock at an exercise price of $2.80 per share.

    On February 26, 1998, we issued unsecured promissory notes, which were
convertible into shares of Series A preferred stock at $15.00 per share, and
warrants to purchase common stock at an exercise price of $14.25 per share, to
the following investors, among others. The notes were due on February 26, 1999
and bore interest at a rate of 8% per annum. In November 1999, these notes were
amended such

                                       53

that they were convertible into shares of common stock at a conversion rate of
$1.25 per share. In December 1999, these warrants were amended to have an
exercise price of $2.80 per share.



NAME                                                        PRINCIPAL AMOUNT OF NOTE   WARRANT SHARES
- ----                                                        ------------------------   --------------
                                                                                 
Gilo Family Partnership...................................          $417,600               43,200
Adi, Elad and Yael Gilo DSP Tel Trusts....................          $ 83,520                8,640
Samuel Kaplan/Ralph Strangis Investment Partnership.......          $ 27,840                2,880
Alan Zimmerman............................................          $ 27,840                2,880
Michael Corwin............................................          $ 27,840                2,880
Neill Brownstein..........................................          $ 55,680                5,760
Pezzola-Foster Trust......................................          $  9,280                  960


    In November 1999, all of these notes were converted into an aggregate of
519,680 shares of common stock at a conversion rate of $1.25 per share. In
December 1999, all of these warrants were exercised for a total of 67,200 shares
of common stock at an exercise price of $2.80 per share.

    On February 3, 1998, we issued promissory notes, which were convertible into
shares of Series A preferred stock at $15.00 per share, and warrants to purchase
common stock at an exercise price of $14.25 per share, to the following
investors, among others. The notes bore interest at a rate of 8% per annum and
were due on January 31, 1999. In November 1999, these notes were amended such
that they were convertible into shares of common stock at a conversion rate of
$1.25 per share. In December 1999, these warrants were amended to have an
exercise price of $2.80 per share.



NAME                                                        PRINCIPAL AMOUNT OF NOTE   WARRANT SHARES
- ----                                                        ------------------------   --------------
                                                                                 
Gilo Family Partnership...................................          $129,920               13,440
Adi, Elad and Yael Gilo DSP Tel Trusts....................          $ 27,840                2,880
Samuel Kaplan/Ralph Strangis Investment Partnership.......          $  9,280                  960
Alan Zimmerman............................................          $  9,280                  960
Michael Corwin............................................          $  9,280                  960
Neill Brownstein..........................................          $ 37,120                3,840
Reshifa Management Holdings Ltd...........................          $  9,280                  960


    In November 1999, all of these notes were converted into an aggregate of
185,600 shares of common stock at a conversion rate of $1.25 per share. In
December 1999, all of these warrants were exercised for a total of 24,000 shares
of common stock at an exercise price of $2.80 per share.

    On December 29, 1997, we issued promissory notes, which were convertible
into shares of Series A preferred stock at $15.00 per share, and warrants to
purchase common stock at an exercise price of $14.25 per share, to the following
investors, among others. The notes bore interest at a rate of 8% per annum and
were due on December 31, 1998. In November 1999, these notes were amended such
that they were convertible into shares of common stock at a conversion rate of
$1.25 per share. In December 1999, these warrants were amended to have an
exercise price of $2.80 per share.



NAME                                                        PRINCIPAL AMOUNT OF NOTE   WARRANT SHARES
- ----                                                        ------------------------   --------------
                                                                                 
Gilo Family Partnership...................................          $148,480               15,360
Adi, Elad and Yael Gilo DSP Tel Trusts....................          $ 27,840                2,880
Samuel Kaplan/Ralph Strangis Investment Partnership.......          $  9,280                  960
Alan Zimmerman............................................          $  9,280                  960
Michael Corwin............................................          $  9,280                  960
Reshifa Management Holdings Ltd...........................          $  9,280                  960


                                       54

    In November 1999, all of these notes were converted into an aggregate of
170,752 shares of common stock at a conversion rate of $1.25 per share. In
December 1999, all of these warrants were exercised for a total of 22,080 shares
of common stock at an exercise price of $2.80 per share.

  GRANTS OF OPTIONS

    We have granted the following options to our officers and directors:



NAME                                                 NUMBER OF OPTIONS   EXERCISE PRICE   DATE OF GRANT
- ----                                                 -----------------   --------------   -------------
                                                                                 
Michael Corwin.....................................       160,000             $0.75           06/99
                                                           80,000             $1.25           11/99
Menashe Shahar.....................................         8,000             $3.13*          11/97
                                                           20,000             $0.50           12/99
                                                            2,000             $2.45*          07/97
Eran Pilovsky......................................       200,000             $1.25           01/00
Arnon Kohavi.......................................       160,000             $1.25           11/99
Stephen Pezzola....................................        15,000             $0.50           10/98
                                                           16,000             $1.50*          02/97
Avraham Fischer....................................        16,000             $1.50*          02/97


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

* In October 1998, these options were repriced to have an exercise price of
$0.50 per share.

  GILO-RELATED TRANSACTIONS

    In March 1997, the Gilo Family Partnership loaned $250,000 to us. The loan
was evidenced by an unsecured demand promissory note bearing interest at a rate
of 9% per annum. This note was paid in full on April 15, 1997.

    On June 25, 1997, the Gilo Family Partnership loaned $200,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at
rate of 8.5% per annum.

    On July 9, 1997, the Gilo Family Partnership loaned $200,000 to us. The loan
was evidenced by an unsecured demand promissory note bearing interest at rate of
9% per annum.

    On July 28, 1997, the Gilo Family Partnership loaned $200,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at
rate of 9% per annum

    On August 14, 1997, the Gilo Family Partnership loaned $200,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at
rate of 9% per annum.

    On September 30, 1997, the demand promissory notes dated June 25, 1997,
July 9, 1997, July 28, 1997 and August 14, 1997, were canceled in exchange for
(i) an unsecured promissory note in the principal amount of $799,117, bearing
interest at a rate of 9% per annum and due on March 31, 1998, and (ii) a warrant
to purchase 105,600 shares of our Common Stock at an exercise price of $11.88
per share. On June 30, 1998, the September 30, 1997 promissory note was canceled
as partial payment for issuance of an unsecured promissory note in the principal
amount of $2,875,555.50, as described above in this prospectus. In
December 1999, this warrant was amended to have an exercise price of $2.80 per
share. This warrant was exercised in December 1999.

    On April 3, 1998, the Gilo Family Partnership loaned $500,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8% per annum. On June 30, 1998, this promissory note was canceled as
partial payment for issuance of the $2,875,555.50 note.

                                       55

    On May 8, 1998, the Gilo Family Partnership loaned $500,000 to us. The loan
was evidenced by an unsecured demand promissory note bearing interest at a rate
of 8% per annum. On June 30, 1998, this note was canceled as partial payment for
issuance of the $2,875,555.50 note.

    On August 4, 1998, the Gilo Family Partnership loaned $500,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8% per annum. On September 28, 1998, this note was canceled in exchange
for 505,913.5 shares of our common stock at a price of $1.00 per share.

    On August 28, 1998, the Gilo Family Partnership loaned $500,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8% per annum. On September 28, 1998, this note was canceled in exchange
for 505,913.5 shares of our common stock at a price of $1.00 per share.

    On November 12, 1998, the Gilo Family Partnership loaned $100,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On November 24, 1998, the Gilo Family Partnership loaned $50,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On December 1, 1998, the promissory notes dated November 12, 1998 and
November 24, 1998, in the aggregate principal amount of $150,000, plus accrued
interest, were canceled in exchange for the issuance of 150,404 shares of our
Series B preferred stock at a price of $1.00 per share.

    On December 4, 1998, the Gilo Family Partnership loaned $50,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On January 5, 1998, the Gilo Family Partnership loaned $250,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On January 25, 1999, the Gilo Family Partnership loaned $50,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On February 12, 1999, the Gilo Family Partnership loaned $100,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On February 28, 1999, the Gilo Family Partnership loaned $60,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On March 1, 1999, the Gilo Family Partnership loaned $225,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On March 11, 1999, the Gilo Family Partnership loaned $150,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On March 31, 1999, the Gilo Family Partnership loaned $300,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On April 8, 1999, the Gilo Family Partnership loaned $50,000 to us. The loan
was evidenced by an unsecured demand promissory note bearing interest at a rate
of 8.5% per annum.

    On April 15, 1999, the Gilo Family Partnership loaned $200,000 to us. The
loan was evidenced by an unsecured demand promissory note bearing interest at a
rate of 8.5% per annum.

    On May 31, 1999, the promissory notes dated December 4, 1998, January 5,
1999, January 25, 1999, February 12, 1999, February 28, 1999, March 1, 1999,
March 11, 1999, March 31, 1999, April 8, 1999 and April 15, 1999, in the
aggregate principal amount of $1,435,000, plus accrued interest, were canceled
in exchange for 1,953,104 shares of our common stock at a price of $0.75 per
share.

                                       56

  OTHER

    Avraham Fischer is a senior partner of the law firm of Fischer, Behar,
Chen & Co., which represents us on matters relating to Israeli law. We paid
approximately $109,500 in legal fees to this firm in 1999.

    In January 2000, in connection with an exercise of options to purchase
common stock, we loaned $249,980 to Eran Pilovsky. Mr. Pilovsky issued a
full-recourse promissory note to us. This note is due on the earlier of
January 16, 2003 or the time at which Mr. Pilovsky sells the shares or leaves
Vyyo and bears interest at rate of 6% per annum. The note is secured by the
purchased shares.

    We sublease our headquarters in Cupertino, California from Zen
Research, Inc. on a month-to-month basis. Zen Research is a wholly owned
subsidiary of a corporation of which Mr. Gilo is a controlling shareholder and a
director. In addition, Mr. Pezzola is the Chairman of the Board of Zen
Research's parent corporation. The monthly rent under our sublease is $12,000.

                                       57

                             PRINCIPAL STOCKHOLDERS

    The following table indicates information as of December 31, 1999 regarding
the beneficial ownership of our common stock by:

    - each person known to the board of directors to own beneficially 5% or more
      of our common stock;

    - each of our directors;

    - the named executive officers; and

    - all of our directors and executive officers as a group.

    Information with respect to beneficial ownership has been furnished by each
director, officer or 5% or more stockholder, as the case may be. Except as
otherwise noted below, the address for each person listed on the table is c/o
Vyyo Inc., 20400 Stevens Creek Boulevard, 8(th) Floor, Cupertino, California
95014.

    Beneficial ownership is determined in accordance with the rules of the
Securities and Exchange Commission which generally attribute beneficial
ownership of securities to persons who possess sole or shared voting power or
investment power with respect to those securities and includes shares of common
stock issuable pursuant to the exercise of stock options or warrants that are
immediately exercisable or exercisable within 60 days. Unless otherwise
indicated, the persons or entities identified in this table have sole voting and
investment power with respect to all shares shown as beneficially owned by them,
subject to applicable community property laws.

    Percentage ownership calculations are based on 17,964,857 shares of common
stock outstanding as of December 31, 1999, which number includes shares of
common stock that will be outstanding upon the conversion of outstanding shares
of preferred stock upon the closing of this offering. To the extent that any
shares are issued upon exercise of options, warrants or other rights to acquire
our capital stock that are presently outstanding or granted in the future or
reserved for future issuance under our stock plans, there will be further
dilution to new public investors.



                                                                                   PERCENT OF SHARES
                                                                                      OUTSTANDING
                                                             NUMBER OF        ---------------------------
                                                        SHARES BENEFICIALLY      BEFORE         AFTER
NAME                                                           OWNED          THE OFFERING   THE OFFERING
- ----                                                    -------------------   ------------   ------------
                                                                                    
Davidi Gilo(1)........................................      11,016,898
ADC Telecommunications, Inc...........................       1,834,402
  P. O. Box 1101
  Minneapolis, MN 55440
Stephen P. Pezzola(2).................................         163,470
Lewis S. Broad(3).....................................          50,694
Neill H. Brownstein(4)................................         133,840
Avraham Fischer(5)....................................         231,392
John Griffin(6).......................................       1,874,402
Samuel Kaplan(7)......................................         145,997
Alan Zimmerman(8).....................................         176,724
Shaul Berger(9).......................................          91,015
Menashe Shahar(10)....................................          23,324
All directors and executive officers
  As a group (12 persons)(11).........................      14,158,838


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

*   Less than 1% of the outstanding shares of common stock.

                                       58

(1) Includes (a) 9,660,784 shares held by The Gilo Family Trust, of which Davidi
    Gilo is a trustee, (b) 552,832 shares held by the PhaseCom Investor Group
    Limited Partnership, of which Harmony Management, Inc. is the general
    partner, (c) 4,876 shares of common stock issuable pursuant to warrants held
    by the PhaseCom Investor Group Limited Partnership, (d) 106,331 shares held
    by the PhaseCom Investor Group Limited Partnership No. 2, of which the
    general partner is Gilo Group, LLC, a limited liability company of which
    Mr. Gilo is a principal owner, and (e) 2,075 shares held in the Davidi and
    Shamaya Gilo Trust, of which Davidi and Shanaya Gilo are the trustees.
    Excludes 158,665 shares held in three trusts for the benefit of Mr. Gilo's
    children, Adi, Elad and Yael Gilo, as to which Mr. Gilo has no voting or
    investment power. Mr. Gilo disclaims beneficial ownership of such shares.

(2) Includes 31,471 shares held in the Pezzola-Foster Trust, of which Stephen
    Pezzola and Twila Foster are the trustees. Also includes 49,000 shares of
    common stock issuable pursuant to stock options exercisable within 60 days
    of March 1, 2000. Excludes 28,000 shares held in two trusts for the benefit
    of Mr. Pezzola's children, Genevieve and David Pezzola, as to which
    Mr. Pezzola has no voting or investment power. Mr. Pezzola disclaims
    beneficial ownership of such shares. Also excludes 2,085 shares held by the
    PhaseCom Investor Group Limited Partnership, of which the Pezzola-Foster
    Trust is a limited partner and as to which Mr. Pezzola has no voting or
    investment power.

(3) Includes 10,000 shares of common stock issuable pursuant to stock options
    exercisable within 60 days of March 1, 2000. Excludes 16,672 shares held by
    the PhaseCom Investor Group Limited Partnership and 3,438 shares held by the
    PhaseCom Investor Group Limited Partnership No. 2, of which Mr. Broad is a
    limited partner and as to which Mr. Broad has no voting or investment power.

(4) Includes 10,000 shares of common stock issuable pursuant to stock options
    exercisable within 60 days of March 1, 2000. Excludes 2,257 shares held by
    the PhaseCom Investor Group Limited Partnership No. 2, of which
    Mr. Brownstein is a limited partner and as to which Mr. Brownstein has no
    voting or investment power.

(5) Includes 150,000 shares of common stock issuable pursuant to stock options
    exercisable within 60 days of March 1, 2000. Excludes shares held by I.
    Fischer & Co. as trustee, or Fischer, Behar & Co., as trustee, on behalf of
    stockholders of Vyyo that are residents of Israel.

(6) Includes 1,834,402 shares held by ADC Telecommunications. Mr. Griffin is an
    officer of ADC Telecommunications and may be deemed to share voting and
    investment power will respect to the shares held by ADC Communications.
    Mr. Griffin disclaims beneficial ownership of these shares.

(7) Includes 105,737 shares held by the Samuel Kaplan/Ralph Strangis Investment
    Partnership, of which Samuel Kaplan is a general partner. Mr. Kaplan
    disclaims beneficial ownership of these shares, except to the extent of his
    pecuniary interest arising from his interest in this entity. Excludes
    6,252 shares held by the PhaseCom Investor Group Limited Partnership and
    2,581 shares held by the PhaseCom Investor Group Limited Partnership No. 2,
    of which Mr. Kaplan is a limited partner and as to which Mr. Kaplan has no
    voting or investment power.

(8) Includes 50,000 shares of common stock issuable pursuant to stock options
    exercisable within 60 days of March 1, 2000. Exclude 8,336 shares held by
    the PhaseCom Investor Group Limited Partnership and 1,716 shares held by the
    PhaseCom Investor Group Limited Partnership No. 2, of which Mr. Zimmerman is
    a limited partner and as to which Mr. Zimmerman has no voting or investment
    power.

(9) Includes 261 shares of common stock issuable pursuant to warrants.

(10) Includes 22,791 shares of common stock issuable pursuant to stock options
    exercisable within 60 days of March 1, 2000.

(11) Includes 331,791 shares of common stock issuable pursuant to stock options
    exercisable within 60 days of March 1, 2000.

                                       59

                          DESCRIPTION OF CAPITAL STOCK

    The following description summarizes information regarding our capital
stock. This information is subject in all respects to the applicable provisions
of the Delaware General Corporation Law, our amended and restated certificate of
incorporation and bylaws.

    Immediately following the closing of this offering, the authorized capital
stock of Vyyo will consist of 200,000,000 shares of common stock, $0.0001 par
value per share, and 5,000,000 shares of preferred stock, $0.001 par value per
share. Immediately following the closing of this offering,       shares of
common stock will be issued and outstanding and no shares of preferred stock
will be issued and outstanding.

COMMON STOCK

    VOTING RIGHTS.  Each outstanding share of common stock is entitled to one
vote on all matters submitted to a vote of Vyyo's stockholders, including the
election of directors. There are no cumulative voting rights, and therefore the
holders of a plurality of the shares of common stock voting for the election of
directors may elect all of Vyyo's directors standing for election.

    DIVIDENDS.  Holders of common stock are entitled to receive dividends at the
same rate if and when dividends are declared by our board of directors out of
assets legally available for the payment of dividends, subject to preferential
rights or any outstanding share of preferred stock. Through our subsidiary, Vyyo
Ltd., we participate in the "alternative benefits program" under the Israeli law
for the Encouragement of Capital Investments, 1959, under which we realize
certain tax exemptions. If Vyyo Ltd. distributes a cash dividend to Vyyo Inc.
from income which is tax exempt, it would have to pay corporate tax at the rate
of up to 25% on an amount equal to the amount distributed and the corporate tax
which would have been due in the absence of the tax exemption.

    LIQUIDATION.  In the event of a liquidation, dissolution or winding up of
the affairs of Vyyo, whether voluntary or involuntary, after payment of the
debts and other liabilities of Vyyo and making provisions for the holders of any
outstanding shares of preferred stock, the remaining assets of Vyyo will be
distributed ratably among the holders of shares of common stock.

    RIGHTS AND PREFERENCES.  The common stock has no preemptive, redemption,
conversion or subscription rights. The rights, powers, references and privileges
of holders of common stock and subject to, and may be adversely affected by, the
rights of the holders of shares of any series of preferred took that we any
designate and issue in the future.

    FULLY PAID AND NON-ASSESSABLE.  All outstanding shares of common stock are,
and the shares of common stock be issued pursuant to this offering will be,
fully paid and non-assessable.

PREFERRED STOCK

    The board of directors has the authority, without action by the
stockholders, to provide for the issuance of preferred stock in one or more
classes or series and to designate the rights, preferences and privileges of
each such class or series, which may be greater than the rights of the common
stock. We cannot predict the effect of the issuance of any shares of preferred
stock upon the rights of holders of the common stock until the board of
directors determines the specific rights of the holders of the preferred stock.
However, the effects could include one or more of the following:

    - restricting dividends on the common stock;

    - diluting the voting power of the common stock;

    - impairing the liquidation rights of the common stock; or

                                       60

    - delaying or preventing a change in control of us without further action by
      the stockholders.

    Upon the consummation of this offering, no shares of preferred stock will be
outstanding, and we have no present plans to issue any shares of preferred
stock.

REGISTRATION RIGHTS

    Upon completion of the offering, the holders of an aggregate of
approximately       shares of common stock will be entitled to rights with
respect to the registration of these shares under the Securities Act of 1933, as
amended, or the Securities Act. Under the terms of the registration rights
agreements, if Vyyo proposes to register any of its securities under the
Securities Act, either for its own account or for the account of other security
holders exercising registration rights, these holders are entitled to notice of
this registration and are entitled to include shares of common stock in the
registration. The rights are subject to conditions and limitations, among them
the right of the underwriters of an offering subject to the registration to
limit the number of shares included in the registration. These registration
rights have been waived with respect to this offering. Holders of these rights
may also require Vyyo to file a registration statement under the Securities Act
at its expense with respect to their shares of common stock, and Vyyo is
required to use its best efforts to effect this registration, subject to
conditions and limitations. Furthermore, stockholders with registration rights
may require Vyyo to file additional registration statements on Form S-3, subject
to conditions and limitations.

DELAWARE ANTI-TAKEOVER LAW

    We are subject to Section 203 of the Delaware General Corporation Law, an
anti-takeover law. Generally, Section 203 of the Delaware General Corporation
Law prohibits a publicly held Delaware corporation from engaging in a "business
combination" with an "interested stockholder" for a period of three years after
the date of the transaction in which the person became an interested
stockholder, unless (i) prior to the date of the business combination, the
transaction is approved by the board of directors of the corporation, (ii) upon
consummation of the transaction which resulted in the stockholder becoming an
interested stockholder, the interested stockholder owns at least 85% of the
outstanding voting stock of the corporation, or (iii) on or after the date of
the business combination, such business combination is approved by the board of
directors of the corporation and by the affirmative vote of at least 66 2/3% of
the outstanding voting stock which is not owned by the interested stockholder. A
"business combination" includes mergers, asset sales and other transactions
resulting in a financial benefit to the stockholder. An "interested stockholder"
is a person who, together with affiliates and associates, owns (or within the
three-year period immediately prior to the relevant date, did own) 15% or more
of the corporation's outstanding voting stock. The existence of this provision
would be expected to have an anti-takeover effect with respect to transactions
not approved in advance by our board of directors, including discouraging
attempts that might result in a premium over the market price for the shares of
common stock held by stockholders.

TRANSFER AGENT AND REGISTRAR

    EquiServe Trust Company will serve as Transfer Agent and Registrar for our
common stock. Its telephone number is (781) 575-2000.

LISTING

    We have applied to have our common stock approved for quotation on the
Nasdaq National Market under the trading symbol "VYYO."

                                       61

                        SHARES ELIGIBLE FOR FUTURE SALE

    We cannot predict if future sales of our common stock, or the availability
of our common stock for sale, will depress the market price for our common stock
or our ability to raise capital by offering equity securities. Sales of
substantial amounts of common stock, or the perception that these sales could
occur, may depress prevailing market prices for the common stock.

    After this offering, approximately       shares of common stock will be
outstanding. All of the shares sold in this offering will be freely tradeable
except for any shares purchased by       and other affiliates of Vyyo. The
remaining shares of common stock outstanding after this offering will be
restricted as a result of securities laws or lock-up agreements. These remaining
shares will be available for sale in the public market as follows:



                                                                NUMBER OF
DATE OF AVAILABILITY FOR SALE                                    SHARES
- -----------------------------                                 -------------
                                                           
As of the date of the prospectus............................
     , 2000.................................................
At various times afterwards upon expiration of applicable
  holding periods...........................................


    Banc of America Securities LLC may release all or a portion of the shares
subject to this lockup agreement at any time without notice. See "Underwriting."

    In general, under Rule 144, as currently in effect, a person who has
beneficially owned shares of our common stock for at least one year would be
entitled to sell within any three-month period a number of shares that does not
exceed the greater of:

    - 1% of the number of shares of common stock then outstanding, which will
      equal approximately shares immediately after this offering; or

    - the average weekly trading volume of the common stock on the Nasdaq
      National Market during the four calendar weeks preceding the filing of a
      notice on Form 144 with respect to the sale.

    Sales under Rule 144 are also subject to manner of sales provisions and
notice requirements and to the availability of current public information about
us.

    Under Rule 144(k), a person who is not deemed to have been one of our
affiliates at any time during the 90 days preceding a sale, and who has
beneficially owned the shares proposed to be sold for at least two years,
including the holding period of any prior owner other than an affiliate, is
entitled to sell the shares without complying with the manner of sale, public
information, volume limitation or notice provisions of Rule 144.

    Rule 701, as currently in effect, permits resales of shares in reliance upon
Rule 144 but without compliance with certain restrictions, including the holding
period requirement, of Rule 144. Any of our employees, officers, directors or
consultants who purchased shares under a written compensatory plan or contract
may be entitled to rely on the resale provisions of Rule 701. Rule 701 permits
affiliates to sell their Rule 701 shares under Rule 144 without complying with
the holding period requirements of Rule 144. Rule 701 further provides that
non-affiliates may sell their shares in reliance on Rule 144 without having to
comply with the holding period, public information, volume limitation or notice
provisions of Rule 144. All holders of Rule 701 shares are required to wait
until 90 days after the date of this prospectus before selling their shares.
However, substantially all Rule 701 shares are subject to lock-up agreements and
will only become eligible for sale at the earlier of the expiration of the
180-day lock-up agreements or no sooner than 90 days after the offering upon
obtaining the prior written consent of Banc of America Securities LLC.

                                       62

    We intend to file a registration statement registering shares of common
stock subject to outstanding options or reserved for future issuance under our
stock plans. As of             , options to purchase a total of           shares
were outstanding under our stock option plans. Common stock issued upon exercise
of outstanding vested options, other than common stock issued to our affiliates,
is available for immediate resale in the open market.

                                       63

                                  UNDERWRITING

    We are offering the shares of common stock described in this prospectus
through a number of underwriters. Banc of America Securities LLC, CIBC World
Markets Corp. and Dain Rauscher Incorporated are the representatives of the
underwriters. We have entered into an underwriting agreement with the
representatives. According to the terms and conditions of the underwriting
agreement, we have agreed to sell to the underwriters, and each of the
underwriters has agreed to purchase, the number of shares of common stock listed
net to its name in the following table:



                                                              NUMBER OF
UNDERWRITER                                                    SHARES
- -----------                                                   ---------
                                                           
Banc of America Securities LLC..............................
CIBC World Markets Corp.....................................
Dain Rauscher Incorporated..................................

                                                               -------
    Total...................................................
                                                               =======


    The underwriters initially will offer shares to the public at the price
specified on the cover page of this prospectus. The underwriters may allow to
some dealers a concession of not more than $      per share. The underwriters
also may allow, and any other dealers may reallow, a concession of not more than
$      per share to some other dealers. If all the shares are not sold at the
initial public offering price, the underwriters may change the offering price
and the other selling terms. The common stock is offered under a number of
conditions, including:

    - receipt and acceptance of our common stock by the underwriters, and

    - the right to reject orders in whole or in part.

    We have granted an option to the underwriters to buy up to       additional
shares of common stock. These additional shares would cover sales of shares by
the underwriters which exceed the number of shares specified in the table above.
The underwriters have 30 days to exercise this option. If the underwriters
exercise this option, they will each purchase additional shares approximately in
proportion to the amounts specified in the table above.

    We, all our stockholders and all of our officers and directors have entered
into lock-up agreements with the underwriters. Under those agreements, we and
those holders of stock and options may not dispose of or hedge any common stock
or securities convertible into or exchangeable for shares of common stock. These
restrictions will be in effect for a period of 180 days after the date of this
prospectus. At any time and without notice, Banc of America Securities LLC may,
in its sole discretion, release all or some of the securities from these lock-up
agreements.

    We will indemnify the underwriters against some liabilities, including some
liabilities under the Securities Act. If we are unable to provide this
indemnification, we will contribute to payments the underwriters may be required
to make in respect of those liabilities.

    We have applied to have the shares of common stock approved for listing on
the Nasdaq National Market under the symbol "VYYO."

                                       64

    In connection with this offering, the underwriters may purchase and sell
shares of common stock in the open market. These transactions may include:

    - short sales,

    - stabilizing transactions, and

    - purchase to cover positions created by short sales.

    Short sales involve the sale by the underwriters of a greater number of
shares than they are required to purchase in this offering. Stabilizing
transactions consist of bids or purchases made for the purpose of preventing or
retarding a decline in the market price of the common stock while this offering
is in progress.

    The underwriters also may impose a penalty bid. This means that if the
representatives purchase shares in the open market in stabilizing transactions
or to cover short sales, the representatives can require the underwriters that
sold those shares as part of this offering to repay the underwriting discount
received by them.

    The underwriters may engage in activities that stabilize, maintain or
otherwise affect the price of the common stock, including:

    - over-allotment,

    - stabilization,

    - syndicate covering transactions, and

    - imposition of penalty bids.

    As a result of these activities, the price of the common stock may be higher
than the price that otherwise might exist in the open market. If the
underwriters commence these activities, they may discontinue them at any time.
The underwriters may carry out these transactions on the Nasdaq National Market,
in the over-the-counter market or otherwise.

    The underwriters do not expect sales to discretionary accounts to exceed 5%
of the total number of shares of common stock offered by this prospectus.

    Prior to this offering, there has been no public market for our common
stock. The initial public offering price was negotiated between us and the
underwriters. Among the factors that will be considered in the negotiations are:

    - our history and prospects, and the history and prospects of the industry
      in which we compete,

    - our past and present financial performance,

    - an assessment of our management,

    - the present state of our development,

    - our prospects for future earnings,

    - the prevailing market conditions of the applicable U.S. securities market
      at the time of this offer,

    - market valuations of publicly traded companies that we and the
      underwriters believe to be comparable to US.

    The underwriters have reserved up to       shares of the common stock to be
sold in this offering for sale to some of our employees, directors and their
associates, and to other individuals or companies who have commercial
arrangements or personal relationships with us. Through this directed

                                       65

share program, we intend to ensure that those individuals and companies that
have supported us, or who are in a position to support us in the future, have
the opportunity to purchase our common stock at the same price that we are
offering our shares to the general public. We do not currently expect that more
than approximately       individuals (including our employees, directors and
their associates) and companies will participate in the directed share program.
Prospective participants will not receive any investment materials other than a
copy of this prospectus, and will be permitted to participate in this offering
at the initial public offering price presented on the cover page of this
prospectus. No commitment to purchase shares by any participant in the directed
share program will be accepted until after the registration statement of which
this prospectus is a part is effective and an initial public offering price has
been established. The number of shares available for sale to the general public
will be reduced by the number of shares sold through the directed share program.

    From time to time, Banc of America Securities LLC has provided financial
advisory services to Vyyo and may continue to do so in the future.

                                       66

                                 LEGAL MATTERS

    The validity of the shares of common stock being offered will be passed upon
for us by Skadden, Arps, Slate, Meagher & Flom LLP, Palo Alto, California.
Certain other legal matters in connection with this offering will be passed upon
for us by Bay Venture Counsel, LLP. Certain matters of Israeli law will be
passed upon for us by Fischer, Behar, Chen & Co., Tel Aviv, Israel. Certain
legal matters in connection with this offering will be passed upon for the
underwriters by Brobeck, Phleger & Harrison LLP, San Francisco, California.

                                    EXPERTS

    Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements at December 31, 1998 and 1999, and for the three years in
the period ended December 31, 1999, as set forth in their report. We have
included our financial statements in the prospectus and elsewhere in the
registration statement in reliance on Ernst & Young LLP's report, given upon the
authority of such firm as experts in accounting and auditing.

                             AVAILABLE INFORMATION

    We filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act with respect to the shares of
common stock being offered. This prospectus does not contain all of the
information described in the registration statement and the related exhibits and
schedules. For further information with respect to Vyyo and the common stock
being offered, reference is made to the registration statement and the related
exhibits and schedule. Statements contained in this prospectus regarding the
contents of any contract or any other document to which reference is made are
not necessarily complete, and, in each instance, reference is made to the copy
of the contract or other document filed as an exhibit to the registration
statement, each statement being qualified in all respects by the reference. A
copy of the registration statement and the related exhibits and schedule may be
inspected without charge at the public reference facilities maintained by the
Commission in Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and at
the Commission's regional offices located at the Northwestern Atrium Center, 500
West Madison Street, Suite 1400, Chicago, Illinois 60661 and Seven World Trade
Center, 13th Floor, New York, New York 10048, and copies of all or any part of
the registration statement may be obtained from these offices upon the payment
of the fees prescribed by the Commission. Information on the operation of the
Public Reference Room may be obtained by calling the Commission at
1-800-SEC-0330. The Commission maintains a World Wide Web site that contains
reports, proxy and information statements and other information regarding
registrants that file electronically with the Commission. The address of the
site is http://www.sec.gov.

    Vyyo intends to provide its stockholders with annual reports containing
combined financial statements audited by an independent accounting firm and
quarterly reports containing unaudited combined financial data for the first
three quarters of each year.

                                       67

                                   VYYO INC.
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS




                                                           
Report of Ernst & Young LLP, Independent Auditors...........     F-2
Consolidated Balance Sheets as of December 31, 1998 and
  1999......................................................     F-3
Consolidated Statements of Operations for the years ended
  December 31, 1997, 1998 and 1999..........................     F-4
Consolidated Statements of Stockholders' Equity (Net Capital
  Deficiency) for the years ended December 31, 1997, 1998
  and 1999..................................................     F-5
Consolidated Statements of Cash Flows for the years ended
  December 31, 1997, 1998 and 1999..........................     F-6
Notes to Consolidated Financial Statments...................     F-7


                                      F-1

               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders

Vyyo, Inc.

    We have audited the accompanying consolidated balance sheets of Vyyo Inc. as
of December 31, 1998 and 1999, and the related consolidated statements of
operations, stockholders' equity (net capital deficiency) and cash flows for
each of the three years in the period ended December 31, 1999. These financial
statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.

    We conducted our audits in accordance with generally accepted auditing
standards in the United States. Those standards require that we plan and perform
the audit to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements. An
audit also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

    In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of Vyyo Inc. at
December 31, 1998 and 1999, and the consolidated results of its operations and
its cash flows for each of the three years in the period ended December 31,
1999, in conformity with generally accepted accounting principles in the United
States.

                                          Ernst & Young LLP

San Jose, California
January 28, 2000

                                      F-2

                                   VYYO INC.

                          CONSOLIDATED BALANCE SHEETS

                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)



                                                                                     PRO FORMA
                                                              DECEMBER 31,         STOCKHOLDERS'
                                                           -------------------       EQUITY AT
                                                             1998       1999     DECEMBER 31, 1999
                                                           --------   --------   -----------------
                                                                        
                                              ASSETS
Current assets:
Cash and cash equivalents................................  $    131   $  5,036
Accounts receivable, net of allowance for doubtful
  accounts of $187 and $176 in 1998 and 1999,
  respectively...........................................       247        583
Inventory................................................     1,644      1,132
Other....................................................       107        315
                                                           --------   --------
Total current assets.....................................     2,129      7,066
Property and equipment, net..............................     1,010      1,095
                                                           --------   --------
                                                           $  3,139   $  8,161
                                                           ========   ========

                  LIABILITIES AND STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)
Current liabilities:
Bank line of credit......................................  $  1,970   $  2,280
Accounts payable.........................................     1,219        895
Accrued liabilities......................................     2,072      2,951
Notes payable to stockholders............................     6,882         --
Deferred income..........................................       140        639
Equipment financing obligations..........................       427         91
                                                           --------   --------
Total current liabilities................................    12,710      6,856

Commitments and contingencies

Stockholders' equity (net capital deficiency):
Convertible preferred stock, $0.001 par value at amounts
  paid in; 100,000,000 shares authorized at December 31,
  1999; 2,213,688 and 11,564,269 shares issued and
  outstanding at December 31, 1998 and 1999 convertible
  into 2,629,702 shares of common stock at December 31,
  1999; aggregate liquidation preference of $14,243 at
  December 31, 1999......................................    10,335     15,369       $     --
Common stock, $0.0001 par value at amounts paid in;
  200,000,000 shares authorized at December 31, 1998 and
  1999; 1,812,602 and 15,335,155 shares issued and
  outstanding at December 31, 1998 and 1999,
  respectively; 17,964,857 shares issued and outstanding
  pro forma..............................................     2,649     27,612         42,981
Note receivable from stockholder.........................        --       (920)          (920)
Deferred stock compensation..............................        --     (6,000)        (6,000)
Accumulated deficit......................................   (22,555)   (34,756)       (34,756)
                                                           --------   --------       --------
Total stockholders' equity (net capital deficiency)......    (9,571)     1,305       $  1,305
                                                           --------   --------       ========
                                                           $  3,139   $  8,161
                                                           ========   ========


                             See accompanying notes

                                      F-3

                                   VYYO INC.

                     CONSOLIDATED STATEMENTS OF OPERATIONS

                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)



                                                                 YEARS ENDED DECEMBER 31,
                                                              ------------------------------
                                                                1997       1998       1999
                                                              --------   --------   --------
                                                                           
Net revenues................................................  $  1,537   $  2,449   $  4,230
Cost of revenues............................................     1,556      2,568      4,316
                                                              --------   --------   --------
  Gross loss................................................       (19)      (119)       (86)
Operating expenses:
  Research and development..................................     2,398      3,252      3,678
  Sales and marketing.......................................     1,484      2,413      1,972
  General and administrative................................     1,200      1,363      2,148
  Amortization of deferred stock compensation...............        --         --      3,600
                                                              --------   --------   --------
Total operating expenses....................................     5,082      7,028     11,398
                                                              --------   --------   --------
Operating loss..............................................    (5,101)    (7,147)   (11,484)
Interest income.............................................        41         10         36
Interest expense and other..................................      (285)      (534)      (753)
                                                              --------   --------   --------
Net loss....................................................  $ (5,345)  $ (7,671)  $(12,201)
                                                              ========   ========   ========
Net loss per share:
  Basic and diluted                                           $  (8.86)  $  (8.15)  $  (2.27)
                                                              ========   ========   ========
  Pro forma basic and diluted (unaudited)                                           $  (1.81)
                                                                                    ========
Number of shares used in per share computation:
  Basic and diluted                                                603        941      5,385
                                                              ========   ========   ========
  Pro forma basic and diluted (unaudited)                                              6,758
                                                                                    ========


                            See accompanying notes.

                                      F-4

                                   VYYO INC.

    CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)

                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)



                                  CONVERTIBLE                                    NOTE
                                PREFERRED STOCK          COMMON STOCK         RECEIVABLE       DEFERRED
                             ---------------------   ---------------------       FROM            STOCK       ACCUMULATED
                               SHARES      AMOUNT      SHARES      AMOUNT     STOCKHOLDER    COMPENSATION      DEFICIT
                             ----------   --------   ----------   --------   -------------   -------------   ------------
                                                                                        
Balance at December 31,
  1996.....................   1,380,851   $ 7,996       552,340   $   983            --              --       $   (9,539)
Exchange of stock for
  subsidiary...............       1,092        --           437        --            --              --               --
Issuance of preferred and
  common shares for cash,
  net of issuance costs....     202,167     1,736        80,867       193            --              --               --
Issuance of warrants to
  purchase common stock....          --        --            --       165            --              --               --
Net loss...................          --        --            --        --            --              --           (5,345)
                             ----------   -------    ----------   -------      --------        --------       ----------
Balance at December 31,
  1997.....................   1,584,110     9,732       633,644     1,341            --              --          (14,884)
Issuance of common stock
  net of issuance costs....          --        --       175,528       171            --              --               --
Issuance of Series A
  preferred stock net of
  issuance costs...........      21,123        15            --        --            --              --               --
Issuance of Series B
  preferred stock net of
  issuance costs...........     629,447       603            --        --            --              --               --
Conversion of notes payable
  to stockholders into
  common stock.............          --        --     1,011,827     1,012            --              --               --
Repurchase of preferred
  stock and common stock...     (20,992)      (15)       (8,397)       (5)           --              --               --
Issuance of warrants to
  purchase common stock....          --        --            --       130            --              --               --
Net loss...................          --        --            --        --            --              --           (7,671)
                             ----------   -------    ----------   -------      --------        --------       ----------
Balance at December 31,
  1998.....................   2,213,688    10,335     1,812,602     2,649            --              --          (22,555)
Issuance of common stock,
  net of issuance costs....          --        --     4,417,333     3,481      $   (920)             --               --
Issuance of Series C
  preferred stock, net of
  issuance costs...........   9,350,581     5,034            --        --            --              --               --
Issuance of common stock
  upon exercise of
  warrants, net of issuance
  costs....................          --        --       727,947     1,947            --              --               --
Conversion of notes payable
  to shareholders into
  common stock.............          --        --     7,418,836     9,090            --              --               --
Issuance of common stock
  upon exercise of
  options..................          --        --       958,437       845            --              --               --
Deferred stock
  compensation.............          --        --            --     9,600            --          (9,600)              --
Amortization of deferred
  stock compensation.......          --        --            --        --            --           3,600               --
Net loss...................          --        --            --        --            --              --          (12,201)
                             ----------   -------    ----------   -------      --------        --------       ----------
Balance at December 31,
  1999.....................  11,564,269   $15,369    15,335,155   $27,612      $   (920)       $ (6,000)      $  (34,756)
                             ==========   =======    ==========   =======      ========        ========       ==========


                                 TOTAL
                             STOCKHOLDERS'
                                EQUITY
                             (NET CAPITAL
                              DEFICIENCY)
                             -------------
                          
Balance at December 31,
  1996.....................   $     (560)
Exchange of stock for
  subsidiary...............           --
Issuance of preferred and
  common shares for cash,
  net of issuance costs....        1,929
Issuance of warrants to
  purchase common stock....          165
Net loss...................       (5,345)
                              ----------
Balance at December 31,
  1997.....................       (3,811)
Issuance of common stock
  net of issuance costs....          171
Issuance of Series A
  preferred stock net of
  issuance costs...........           15
Issuance of Series B
  preferred stock net of
  issuance costs...........          603
Conversion of notes payable
  to stockholders into
  common stock.............        1,012
Repurchase of preferred
  stock and common stock...          (20)
Issuance of warrants to
  purchase common stock....          130
Net loss...................       (7,671)
                              ----------
Balance at December 31,
  1998.....................       (9,571)
Issuance of common stock,
  net of issuance costs....        2,561
Issuance of Series C
  preferred stock, net of
  issuance costs...........        5,034
Issuance of common stock
  upon exercise of
  warrants, net of issuance
  costs....................        1,947
Conversion of notes payable
  to shareholders into
  common stock.............        9,090
Issuance of common stock
  upon exercise of
  options..................          845
Deferred stock
  compensation.............           --
Amortization of deferred
  stock compensation.......        3,600
Net loss...................      (12,201)
                              ----------
Balance at December 31,
  1999.....................   $    1,305
                              ==========


                            See accompanying notes.

                                      F-5

                                   VYYO INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

                                 (IN THOUSANDS)



                                                                 YEARS ENDED DECEMBER 31,
                                                              ------------------------------
                                                                1997       1998       1999
                                                              --------   --------   --------
                                                                           
OPERATING ACTIVITIES
Net loss....................................................  $(5,345)   $(7,671)   $(12,201)
Adjustments to reconcile net loss to net cash used in
  operating activities:
  Depreciation and other....................................      343        368         454
  Amortization of deferred stock compensation...............       --         --       3,600
  Changes in assets and liabilities:
    Accounts receivable.....................................     (132)        (8)       (336)
    Prepaid expenses and other current assets...............       17         34        (208)
    Inventory...............................................     (639)      (638)        512
    Other assets............................................        4          7          --
    Accounts payable........................................      287        636        (246)
    Accrued liabilities.....................................      813        455       1,702
    Deferred income.........................................       --        140         499
                                                              -------    -------    --------
Net cash used in operating activities.......................   (4,652)    (6,677)     (6,224)
                                                              -------    -------    --------
INVESTING ACTIVITIES
Purchases of property and equipment.........................     (430)      (305)       (581)
Proceeds from sales of property and equipment...............       --         --          42
                                                              -------    -------    --------
Net cash used in investing activities.......................     (430)      (305)       (539)
                                                              -------    -------    --------

FINANCING ACTIVITIES
Proceeds from notes payable to stockholders.................    2,126      5,834       1,385
Proceeds from note receivable from stockholders.............       --         --       2,080
Proceeds from debt..........................................      300      1,970         310
Repayments of capital lease obligations.....................       --         --        (336)
Repayments of debt and capital lease obligations............     (321)    (2,100)         --
Repurchase of preferred stock and common stock..............       --        (20)         --
Issuance of preferred stock and common stock................    1,929        789       8,229
Issuance of warrants to purchase common stock...............       99        130          --
                                                              -------    -------    --------
Net cash provided by financing activities...................    4,133      6,603      11,668
                                                              -------    -------    --------
Increase (decrease) in cash and cash equivalents............     (949)      (379)      4,905
  Cash and cash equivalents at beginning of period..........    1,459        510         131
                                                              -------    -------    --------
Cash and cash equivalents at end of period..................  $   510    $   131    $  5,036
                                                              =======    =======    ========
NONCASH FINANCING ACTIVITIES
Conversion of loan from stockholder into warrant to purchase
  common stock..............................................  $    66    $    --          --
                                                              =======    =======    ========
Conversion of stockholders' notes into common stock.........  $    --    $ 1,012    $  9,090
                                                              =======    =======    ========
Issuance of common stock for note receivable................                        $  3,000
                                                              =======    =======    ========
SUPPLEMENTAL CASH FLOW INFORMATION
Interest paid...............................................  $   158    $   143    $    141
                                                              =======    =======    ========


                            See accompanying notes.

                                      F-6

                                   VYYO INC.

                         NOTES TO FINANCIAL STATEMENTS

                               DECEMBER 31, 1999

1. BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

  ORGANIZATION AND BASIS OF PRESENTATION

    Vyyo Inc. was incorporated as a Delaware corporation in 1996. In
January 2000, the Company changed its name from PhaseCom, Inc. to Vyyo Inc. and
its subsidiary (collectively, "Vyyo" or the "Company") is a global provider of
broadband wireless access systems used by telecommunications service providers
to deliver wireless high-speed data connections to businesses and residential
subscribers. The Company sells its products directly to service providers and to
system integrators. The majority of the Company's revenues are generated from
sales to customers in North America.

    The Company's consolidated financial statements reflect the operations of
Vyyo Inc. and its wholly owned Israeli subsidiary, Vyyo Ltd. All significant
intercompany transactions and balances have been eliminated in consolidation.

  REVENUE RECOGNITION

    Net revenues include product revenues and in 1999 also include $480,000 of
technology development revenues. Product revenues are derived primarily from
sales of hubs and modems to telecommunications service providers and to system
integrators. Product revenues are generally recorded when products are shipped,
provided there are no customer acceptance requirements and the Company has no
additional performance obligations. The Company accrues for estimated sales
returns and exchanges and product warranty and liability costs upon recognition
of product revenues.

    Technology development revenues are related to a best efforts arrangement
with a customer. Due to technology risk factors, the costs of the technology
development efforts are expensed when incurred and the revenues are recognized
when the applicable customer milestones are met, including deliverables, but not
in excess of the estimated amount that would be recognized using the
percentage-of completion method. We expect to complete this arrangement in
fiscal year 2000.

    Deferred revenues represent amounts received from customers for products
subject to return or exchange and payments on technology development contracts
not yet recognized as revenue.

  RISK FACTORS AND CONCENTRATIONS

    The Company is subject to various risks similar to other companies in a
comparable stage of growth, including dependence on key individuals, competition
from substitute products and larger companies, the need to obtain additional
financing, and the continued successful development and marketing of its
products. The Company used over $17 million in operating activities in 1997,
1998 and 1999. The Company will require additional financing to continue its
operations and execute its business plan. The Company believes adequate
additional debt or equity financing is available to fund planned operations
through fiscal 2000.

    Financial instruments that subject the Company to credit risk consist
primarily of uninsured cash and cash equivalents, most of which is held at
high-quality financial institutions in the United States and trade receivables.
The Company performs ongoing credit evaluations of its customers and generally
does not require collateral. The Company provides reserves for estimated credit
losses. Provisions for bad debts in 1997, 1998 and 1999 were $0, $11,000 and
$198,000, respectively. Write-offs of uncollectible accounts in 1999 was
$209,000 and none in 1997 and 1998.

                                      F-7

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

    Sales to one customer represented 12%, 31% and 20% of total revenues for the
years ended December 31, 1997, 1998 and 1999. Sales to two other customers
represented 11% and 27% of total revenues for the year ended December 31, 1997.
Sales to another customer represented 15% and 13% of total revenues for the
years ended 1998 and 1999. Sales to two other customers represented 14% and 12%,
respectively, of total revenues for the year ended December 31, 1999. Sales to
one other customer represented 23% of revenues for the year ended December 31,
1998.

    In August 1999, ADC Telecommunications, Inc. ("ADC"), one of the Company's
major customers made an approximately 10% equity investment in the Company.
Revenues from ADC for the period from August 1999 through fiscal year end 1999
amounted to $654,000.

  USE OF ESTIMATES

    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from these estimates.

  RESEARCH AND DEVELOPMENT

    Research and development costs are expensed as incurred and consist
primarily of personnel, facilities, equipment and supplies for our research and
development activities.

  PROPERTY AND EQUIPMENT

    Property and equipment are recorded at cost. Depreciation and amortization
are provided using the straight-line method over the estimated useful lives of
the assets (generally from three to five years), or the life of the lease,
whichever is shorter.

  FOREIGN CURRENCY TRANSACTIONS

    The U.S. dollar is the functional currency for the Company's foreign
subsidiary operations. Substantially all of the Company's foreign subsidiary's
sales are made in U.S. dollars. In addition, a substantial portion of the
foreign subsidiary's costs are incurred in U.S. dollars. Since the U.S. dollar
is the primary currency in the economic environment in which the foreign
subsidiary operates, and, accordingly, monetary accounts maintained in
currencies other than the U.S. dollar (principally cash and liabilities) are
remeasured using the foreign exchange rate at the balance sheet date.
Operational accounts and nonmonetary balance sheet accounts are measured and
recorded at the rate in effect at the date of the transaction. The effects of
foreign currency remeasurement are reported in current operations and have not
been material to date.

  CASH EQUIVALENTS

    The Company considers all highly liquid investments with maturity of three
months or less, at the date of purchase, to be cash equivalents.

  NET LOSS PER SHARE

    Basic and diluted net loss per share are presented in accordance with SFAS
No. 128, "Earnings per Share" ("SFAS 128"), for all periods presented. Pursuant
to the Securities and Exchange Commission Staff Accounting Bulletin No. 98,
common shares and convertible preferred shares issued or granted

                                      F-8

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

for nominal consideration prior to the anticipated effective date of the
Company's initial public offering (the "Offering", see Note   ) must be included
in the calculation of basic and diluted net loss per share as if they had been
outstanding for all periods presented. To date, the Company has not had any
issuances or grants for nominal consideration.

    Pro forma basic and diluted net loss per share have been computed using the
weighted-average number of common shares outstanding during the period. Pro
forma basic and diluted pro forma net loss per share, as presented in the
statements of operations, have been computed as described above and also give
effect to the conversion of all preferred shares that will convert automatically
upon completion of the Offering (using the as-if converted method) from original
date of issuance.

  SHARE AND PER SHARE DATA

    On January 3, 2000, the Company effected a 5-for-1 reverse stock split of
its common stock. Common share, per common share data, and the preferred stock
conversion rates retroactively reflect the reverse stock splits. As a result of
the stock split, the preferred stock is convertible to common stock at the
following rations: Series A at 5 for 2, Series B at 5 for 1, and Series C at 5
for 1.

  UNAUDITED PRO FORMA STOCKHOLDERS' EQUITY

    All of the preferred shares will automatically be converted into common
shares upon completion of the Offering (see Note 8). The preferred stock is
convertible to common stock at the following split-adjusted ratios: Series A at
5 for 2, Series B at 5 for 1, and Series C at 5 for 1. Unaudited pro forma
stockholders' equity at December 31, 1999, as adjusted for the assumed
conversion of such shares, is disclosed on the balance sheet.

  ACCOUNTING FOR STOCK-BASED COMPENSATION

    The Company has elected to follow Accounting Principles Board Opinion
No. 25, "Accounting for Stock Issued to Employees" ("APB 25") and related
interpretations in accounting for its employee stock options because the
alternative fair value accounting provided for under the Financial Accounting
Standards Board ("FASB") Statement No. 123, "Accounting for Stock-Based
Compensation" ("SFAS 123") requires use of option valuation models that were not
developed for use in valuing employee stock options. Under APB 25, when the
exercise price of the Company's employee stock or options equals the market
price of the underlying stock on the date of the grant, no compensation expense
is recognized.

    During 1999, in connection with the grant of certain stock options and the
issuance of certain shares, the Company recorded deferred compensation expense
representing the difference between the option exercise price or the share
purchase price and the deemed fair value of the Company's common stock on the
date of grant. The deferred compensation costs are being amortized based on the
accelerated method over the vesting period of the options.

  NEW ACCOUNTING PRONOUNCEMENTS

    In June 1998, the Financial Accounting Standard Board (FASB) issued
Statement No. 133, "Accounting for Derivative Instruments and Hedging
Activities" (SFAS No. 133) which establishes accounting and reporting standard
for derivatives instruments and hedging activities. The statement requires
recognition of all derivatives at fair value in the financial statements. FASB
Statement No. 137

                                      F-9

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

"Accounting for Derivative Instruments and Hedging Activities Deferral of the
Effective Date of FASB Statement No. 133" an amendment of FASB Statement
No. 133, defers implementation of SFAS No. 133 until fiscal years begging after
June 15, 2000. The Company believes that, upon implementation, the standard will
not have a significant effect on its financial condition or results of
operations.

2. INVENTORY

    Inventory includes the cost of materials as well as applied labor and
overhead and is stated at the lower of cost (first-in, first-out) or market.
Cost is determined on a standard basis, which approximates costs on a
moving-average basis; market is based upon estimated realizable value. Inventory
is comprised of the following:



                                                                 DECEMBER 31,
                                                              -------------------
                                                                1998       1999
                                                              --------   --------
                                                                (IN THOUSANDS)
                                                                   
Raw materials...............................................   $  516     $  631
Work in process.............................................      774        351
Finished goods..............................................      354        150
                                                               ------     ------
                                                               $1,644     $1,132
                                                               ======     ======


3. PROPERTY AND EQUIPMENT

    Property and equipment consists of the following:



                                                                DECEMBER 31,
                                                             -------------------
                                                               1998       1999
                                                             --------   --------
                                                               (IN THOUSANDS)
                                                                  
Machinery and equipment....................................  $   939     $1,101
Computers..................................................      729      1,084
Furniture and fixtures.....................................      240        259
Vehicles and other.........................................      156         91
                                                             -------     ------
                                                               2,064      2,535

Accumulated depreciation and amortization..................   (1,054)    (1,440)
                                                             -------     ------
Property and equipment, net................................  $ 1,010     $1,095
                                                             =======     ======
Property and equipment under lease:
  Cost.....................................................  $   524        502
  Accumulated depreciation and amortization................     (370)      (418)
                                                             -------     ------
Property and equipment under lease (net):..................  $   154     $   84
                                                             =======     ======


                                      F-10

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

4. ACCRUED LIABILITIES

    Accrued liabilities consist of the following:



                                                                 DECEMBER 31,
                                                              -------------------
                                                                1998       1999
                                                              --------   --------
                                                                (IN THOUSANDS)
                                                                   
Compensation and benefits...................................   $  508     $  990
Warranty....................................................      250        475
Other.......................................................    1,314      1,486
                                                               ------     ------
                                                               $2,072     $2,951
                                                               ======     ======


ACCRUED SEVERANCE LIABILITIES

    The Company's liability for severance pay pursuant to Israeli law is covered
by deposits with financial institutions and by accrual. The net accrued
severance pay liability included in accrued compensation and benefits reflects
the following:



                                                                 DECEMBER 31,
                                                              -------------------
                                                                1998       1999
                                                              --------   --------
                                                                (IN THOUSANDS)
                                                                   
Accrued severance pay.......................................   $ 330      $ 348
Less amount funded..........................................    (241)      (202)
                                                               -----      -----
Unfunded portion, net accrued severance pay.................   $  89      $ 146
                                                               =====      =====


5. BANK LINE OF CREDIT

    The Company has a line of credit arrangement with a bank for an aggregate
amount of $2,500,000. The loans under the line of credit bear interest at a rate
of LIBOR plus 1.5% (7.25% at December 31, 1999). Borrowings and bank guarantees
under the line of credit amounted to $2,280,000 and $220,000, respectively, at
December 31, 1999.

    As of December 31, 1999, all assets of the Company's Israeli subsidiary are
subject to fixed and floating liens pursuant to certain loan agreements. Also,
the Company's property and equipment are subject to floating liens in connection
with investment grants received from the Israeli government and the borrowings
under the line of credit.

6. NOTES PAYABLE TO STOCKHOLDERS

    Notes payable to stockholders were issued in 1997 through 1999. The notes
bore interest at rates varying from 8% to 9% and, in accordance with their
amended terms were due in various dates through 1999. The Convertible Notes
Payable and related accrued interest in the aggregate amount of $10.1 million
were converted in accordance with their amended terms into 1,011,827 and
7,418,836 shares of the Company's common stock in 1998 and 1999, respectively.

                                      F-11

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

7. COMMITMENTS AND CONTINGENCIES

  PURCHASE COMMITMENTS

    From time to time, the Company enters into short term supply agreements with
its vendors. Pursuant to these agreements, the Company may be subject to
penalties and charges for quantities not purchased by agreed-upon dates.

  OPERATING LEASES

    The Company leases its operating facility in Israel under a noncancelable
operating lease that expire in 2003. As of December 31, 1999, future minimum
lease payments under these operating leases were $422,000, $392,000, $370,000
and $370,000 for 2000, 2001, 2002 and 2003 respectively. The Company's
headquarters facility in California is leased month-to-month from a company
under common control of a major stockholder. Rent and related payments to this
company amounted to $44,000 and $343,000 in 1998 and 1999, respectively.

    The gross rental payments under all operating leases were $251,000, $381,000
and $494,000 for the years ended December 31, 1997, 1998 and 1999, respectively.
Rental expense, net of reimbursements from subleases, was $33,000, $127,000 and
$434,000 for the years ended December 31, 1997, 1998 and 1999, respectively.
Aggregate future minimum rentals to be received under noncancelable subleases
are $86,000 as of December 31, 1999.

  CUSTOMER CLAIM

    In 1997, a customer filed a claim against the Company in the amount of
approximately $300,000 alleging damages resulting from certain products being
delivered which did not meet product specifications. The Company no longer sells
or supports these products. The Company believes it has meritorious defenses
against these allegations and it plans to vigorously defend against them.

  PATENT MATTER

    In early 1999, the Company received a written notice from Hybrid Networks,
Inc. ("Hybrid"), a competitor, in which Hybrid claimed to have patent rights in
certain technology and requested that the Company review its products in light
of six of Hybrid's issued patents. The Company is investigating the Hybrid
claims and currently believes the patents are invalid or are not infringed by
the Company's products. However, Hybrid may pursue litigation with respect to
these or other claims. The results of any litigation are inherently uncertain.
Any successful infringement claim or litigation against the Company could have a
significant adverse impact on operating results and financial condition.

  RESEARCH GRANTS

    Prior to 1997, the Company participated in the following research and
development incentive programs:

    a. The Office of the Chief Scientist in the Israeli Ministry of Industry and
       Trade (the "Chief Scientist)
     The Company has obtained grants from the Chief Scientist totaling
       approximately $2 million. These grants were received through 1996. The
       terms of the grants from the Chief Scientist prohibit the transfer of
       technology developed pursuant to the terms of these grants to any

                                      F-12

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

     person, without prior written consent of the Chief Scientist. These grants
       are repayable to the Chief Scientist generally at the rate of 3% of the
       sales of the products developed out of the projects funded, up to an
       amount equal to 100% of the grant received.

    b. Binational Industrial Research and Development Foundation (the "BIRD
    Foundation")
     The Company has participated in programs sponsored by the BIRD Foundation,
    which funds joint US-Israeli teams in the development of technological
    products. The Company received grants totaling approximately $1.7 million
    from the BIRD Foundation for various projects. Grants received from the BIRD
    Foundation are paid back at the rate of 2.5% to 5% of revenues shown from
    the projects funded, up to a maximum amount equal to 150% of the grants
    received.

    As of December 31, 1999, the Company has repaid or provided for the
repayment of grants amounting to $651,000. As the Company currently does not
intend to proceed with the manufacture and sale of products developed within all
of the projects funded by the Chief Scientist or by the BIRD Foundation, it
believes that the remaining contingent royalty liability is approximately
$800,000.

8. STOCKHOLDERS' EQUITY

  PREFERRED STOCK

    As of December 31, 1999, the board of directors had the authority, without
any further vote or action by the stockholders, to provide for the issuance of
up to 100,000,000 shares of preferred stock from time to time in one or more
series with such designations, rights, preferences, and limitations as the board
of directors may determine, including the consideration received therefore, the
number of shares comprising such series, dividend rights, redemption provisions,
liquidation preferences, redemption fund provisions, conversion rights, and
voting rights.



                                                        SHARES ISSUED              COMMON SHARES
                            SHARES AUTHORIZED          AND OUTSTANDING       DESIGNATED FOR CONVERSION
                         ------------------------   ----------------------   -------------------------
                            1998         1999         1998         1999         1998          1999
                         ----------   -----------   ---------   ----------   -----------   -----------
                                                                         
Series A...............   6,000,000     6,000,000   1,584,241    1,584,241     633,696        633,696
Series B...............  15,000,000    40,000,000     629,447      629,447     125,889        125,889
Series C...............          --    40,000,000          --    9,350,581          --      1,870,116
Undesignated...........  14,000,000    14,000,000          --           --          --             --
                         ----------   -----------   ---------   ----------     -------      ---------
                         35,000,000   100,000,000   2,213,688   11,564,269     759,585      2,629,702
                         ==========   ===========   =========   ==========     =======      =========


    The holders of Series A, B, and C preferred stock are entitled to receive,
when and if declared by the board of directors, noncumulative dividends at the
annual rate of $0.0432, $0.08 and $0.0216 per share, respectively, and in that
order of preference, in preference to payment of dividends on common stock. No
dividends have been declared to date.

    Shares of Series A, B, and C preferred stock are convertible, at the
holders' option, into two shares, one share and one share, respectively, of
common stock (as adjusted from time to time for stock splits, stock dividends,
and like events). Each share of Series A, B and C preferred stock will
automatically be converted into shares of common stock upon the closing of an
underwritten public offering of the Company's common stock resulting in
aggregate gross proceeds in excess of $12,500,000 or in a business combination
in which the common stock equivalent value of the Company's stock as a

                                      F-13

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

result of such event and determined as if all the Series A, B and Series C
preferred stock have converted into common stock is $1.00 per share (as adjusted
from time to time for stock splits, stock dividends, and like events). The
holders of preferred stock are entitled to one vote for each share of common
stock into which such preferred shares can be converted.

    In the event of any liquidation, dissolution, or winding up of the Company
("Liquidation Event"), the holders of Series B preferred stock are entitled to
receive, in preference to holders of Series A preferred stock and common stock,
the amount of $1.50 per share plus any declared but unpaid dividends. Before the
payment of any portion of the Series A Liquidation Price ("Series A Liquidation
Price"), the holders of Series C preferred stock, are entitled to receive the
greater of (i) $0.541 per share plus cumulative dividends of four percent per
year in excess of dividends actually paid or (ii) declared and unpaid dividends.
Before payment of any portion of the Series A liquidation preference price and
after payment of the Series B liquidation price, in the event of a Liquidation
Event, the holders of Series A and Series B preferred stock and common stock are
entitled to receive an amount of $0.40 per share ("Series B to Common Stock
Liquidation Price"). After payment of the Series B to Common Stock Liquidation
Price, the holders of Series A preferred stock are entitled to receive, in
preference to holders of common stock, the amount of $4.60 per share plus any
declared but unpaid dividends.

  WARRANTS

    From 1997 through 1998, the Company issued warrants to purchase an aggregate
of 1,164,298 shares of common stock to investors in connection with equity and
convertible note financing transactions. As of December 31, 1999, 125,190
warrants remained outstanding with an average exercise price of $1.89 per share.
These warrants are exercisable through March 2002.

  COMMON STOCK

    As of December 31, 1999, the Company has reserved approximately 2,755,000
shares of common stock for issuance on the conversion of the Series A, B and C
convertible preferred stock and the warrants and 3,661,000 shares of common
stock for issuance of options granted under the stock-based compensation plan.

  STOCK OPTION PLANS

    The Company has the following stock option plans: (i) 1996 Equity Incentive
Plan, (ii) 1999 Employee and Consultant Equity Incentive Plan and (iii) 2000
Employee and Consultant Equity Incentive ("the Plans"). The plans as amended
provide for the grant to employees of incentive stock options ("ISOs"), the
grant to employees, directors, and consultants of nonstatutory stock options,
and the grant of stock options which comply with the applicable requirements of
Israeli law to the extent granted to persons who may be subject to income tax in
Israel. The Plans also provide for the awards of restricted stock and stock
bonuses.

    ISOs granted under the Plans have an exercise price equal to the fair value
as determined by the board of directors of the common stock on the date of
grant. Nonstatutory stock options may not be granted with an exercise price less
than 85% of the fair value as determined by the board of directors of the common
stock on the date of grant. The period within which the option may be exercised
is determined at the time of grant, provided that no term is longer than ten
years. Options generally vest over a four-year period.

                                      F-14

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

    In October 1998, the Company adopted an option exchange program to allow
employees to exchange their options for new options with an exercise price of
$0.5. The program resulted in a total of approximately 197,200 options with
exercise price ranging from $1.50 to $3.15 being exchanged for the new options.
The terms of the repriced options remain the same.

    A summary of stock option activity, and related information, under the Plans
for the years ended December 31, 1997, 1998 and 1999 is as follows (in
thousands, except per share data):



                                              OPTIONS OUTSTANDING                OPTIONS EXERCISABLE
                                        --------------------------------   -------------------------------
                                                                WEIGHTED   WEIGHTED               WEIGHTED
                                         SHARES                 AVERAGE    AVERAGE                AVERAGE
                                        AVAILABLE    NUMBER     EXERCISE     FAIR      NUMBER     EXERCISE
                                        FOR GRANT   OF SHARES    PRICE      VALUE     OF SHARES    PRICE
                                        ---------   ---------   --------   --------   ---------   --------
                                                                                
Balance at December 31, 1996..........      190          29      $1.50
  Granted.............................     (187)        187      $2.45
                                         ------       -----      -----
Balance at December 31, 1997..........        3         216      $2.35       0.53
                                         ------       -----      -----
  Authorized..........................      100          --         --
  Granted.............................     (341)        341      $0.50
  Canceled............................      199        (199)     $2.15
                                         ------       -----      -----
Balance at December 31, 1998..........      (39)        358      $0.80       0.08
  Authorized..........................    4,300          --         --
  Granted.............................   (3,151)      3,151      $1.05
  Exercised...........................       --        (958)     $0.90
  Canceled............................      102        (102)     $1.55
                                         ------       -----      -----
Balance at December 31, 1999              1,212       2,449      $1.03       0.14         494      $0.85
                                         ======       =====      =====      =====       =====      =====


    The average exercise prices for options outstanding as of December 31, 1999
was $0.85. The weighted-average remaining contractual life of those options is
5.21 years.

    Pro forma information regarding net loss is required by SFAS 123 and has
been determined as if the Company had accounted for its stock options under the
fair value method of SFAS 123. The fair value for the stock options was
estimated at the date of grant using a minimum value pricing model and a graded
vesting approach with the following weighted-average assumptions for 1997, 1998
and 1999: risk-free interest rate of 6.5%, 6.5% and 6.0%; dividend yields of
zero; and a weighted-average expected life of the option of approximately 3.6,
2.29 and 2.46 years.

    Option valuation models require the input of highly subjective assumptions.
Because the Company's employee stock options have characteristics significantly
different from those of traded options, and because changes in the subjective
input assumptions can materially affect the fair value estimate, in management's
opinion, the existing models do not necessarily provide a reliable single
measure of the fair value of its employee stock options.

    For purposes of pro forma SFAS 123 disclosures, the estimated fair value of
the options is amortized to expense over the option vesting periods.

                                      F-15

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

    The Company pro forma information follows:



                                                                1997       1998       1999
                                                              --------   --------   --------
                                                                           
Net loss
  As reported...............................................  $ (5,345)  $ (7,671)  $(12,201)
  Pro forma.................................................  $ (5,369)  $ (7,731)  $(12,295)
Basic and diluted loss per share
  As reported...............................................  $  (8.86)  $  (8.15)  $  (2.27)
  Pro forma.................................................  $  (8.90)  $  (8.22)  $  (2.28)


9. NET LOSS PER SHARE

    The following table presents the calculation of basic and diluted and pro
forma basic and diluted net loss per share (in thousands, except per share
data):



                                                               YEAR ENDED
                                                              DECEMBER 31,
                                                                  1999
                                                              ------------
                                                           
Net loss....................................................   $  (12,201)
                                                               ==========

Shares used in computing basic and diluted net loss per
  share.....................................................        5,385
                                                               ==========

Basic and diluted net loss per share........................   $    (2.27)
                                                               ==========

Pro forma
  Shares used above.........................................        5,385
  Pro forma adjustment to reflect weighted effect of assumed
    conversion of convertible preferred stock (unaudited)...        1,373
                                                               ----------
  Shares used in computing pro forma basic and diluted net
    loss per share (unaudited)..............................        6,758
                                                               ----------
  Pro forma basic and diluted net loss per share
    (unaudited).............................................   $    (1.81)
                                                               ==========


    All preferred stock, outstanding stock options, and warrants have been
excluded from the calculation of the diluted loss per common share because all
such securities are antidilutive for all periods presented. The total number of
common shares related to preferred stock, outstanding options and warrants
excluded from the calculations of diluted net loss per share were 1,587,644,
1,850,927, and 5,204,258 for the years ended December 31, 1997, 1998 and 1999.

10. INCOME TAXES

  U.S. INCOME TAXES

    As of December 31, 1999, the Company has U.S. federal and state net
operating loss carryforwards of approximately $6 million. The net operating loss
carryforwards will expire beginning in 2004 through 2019, if not utilized. The
utilization of net operating loss carryforwards may be subject to substantial
annual limitations if there has been a significant "change in ownership." Such a
"change in ownership," as described in Section 382 of the Internal Revenue Code,
may substantially limit the Company's utilization of the net operating loss
carryforwards.

                                      F-16

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

  ISRAELI INCOME TAXES

    The Company has been awarded "Approved Enterprise" status by the Israeli
Government under the Law for the Encouragement of Capital Investments, 1959 (the
"Investment Law"). Benefits pursuant to such investment plans include, among
others, grants on a portion of the costs of fixed assets or reduced tax rates,
and in certain cases a full tax exemption for certain periods. The entitlement
to these benefits is conditional upon the Company's fulfilling the conditions
stipulated by the Investment Law, regulations published thereunder, and the
instruments of approval for the specific investments in Approved Enterprises. In
the event of a failure to comply with these conditions, the benefits may be
canceled and the Company may be required to refund the amount of the benefits,
in whole or in part, with the addition of inflation-adjustment differences and
interest. The Israeli subsidiary is currently entitled to a tax holiday on
undistributed earnings for four years and then a reduced tax rate for the
remaining term of the program on the plan's proportionate share of income.

    Israeli taxable income not eligible for "Approved Enterprise" benefits
mentioned above is taxed at the regular corporate tax rate of 36%.

    As of December 31, 1999, the Company has Israeli net operating loss
carryforwards of approximately $19 million. The Israeli loss carryforwards have
no expiration date. The Company expects that during the period these tax losses
are utilized, most of its income would be tax exempt, and therefore, the
utilization of the net operating losses will generate no tax benefit.
Accordingly, deferred tax assets from such losses have not been included in the
financial statements.

    Pretax losses from foreign (Israeli) operations was approximately
$5 million and $6 million for the years ended December 31, 1998 and 1999,
respectively.

  DEFERRED INCOME TAXES

    Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax assets are as follows:



                                                                 DECEMBER 31,
                                                              -------------------
                                                                1998       1999
                                                              --------   --------
                                                                (IN THOUSANDS)
                                                                   
Deferred tax assets:
  Net operating loss carryforwards..........................   $2,000     $2,600

Valuation allowance.........................................   (2,000)    (2,600)
                                                               ------     ------
Net deferred tax assets.....................................   $   --     $   --
                                                               ======     ======


    The valuation allowance increased by $1.5 million and $600,000 for the years
ended December 31, 1998 and 1999, respectively.

    FASB Statement No. 109 provides for the recognition of deferred tax assets
if realization of such assets is more likely than not. Based upon the weight of
available evidence, which includes our historical operating performance and the
reported cumulative net losses in all prior years, we have provided a full
valuation allowance against our net deferred tax assets as the future
realization of the tax benefit is not sufficiently assured.

                                      F-17

                                   VYYO INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 1999

11. SEGMENTS AND GEOGRAPHIC INFORMATION

    Vyyo operates in one industry segment, the design and marketing of broadband
wireless access systems. The following is a summary of operations within
geographic areas based on the location of the entity purchasing the products:



                                                                 YEARS ENDED DECEMBER 31,
                                                              ------------------------------
                                                                1997       1998       1999
                                                              --------   --------   --------
                                                                           
Revenues from sales to unaffiliated customers:
  North America.............................................   $  295     $1,102     $2,587
  Europe....................................................      560        533        919
  Asia......................................................      613        731        552
  Rest of the world.........................................       69         83        172
                                                               ------     ------     ------
                                                               $1,537     $2,449     $4,230
                                                               ======     ======     ======
Property and Equipment, Net
  Israel....................................................              $  914     $  992
  United States.............................................                  96        103
                                                                          ------     ------
                                                                          $1,010     $1,095
                                                                          ======     ======


12. SUBSEQUENT EVENTS (UNAUDITED)

    On February 2, 2000, the board of directors authorized the Company to
file a registration statement with the U.S. Securities and Exchange Commission
for an initial public offering of its common shares. Also on February 2, 2000,
the board of directors approved the following: (1) an amendment to the 2000
option plan to increase the number of shares reserved for issuance under the
plan by 2,300,000 shares; (2) an automatic annual increase to the shares
reserved under the plan equal to the lesser of 900,000 shares or 5% of the
outstanding shares; (3) the adoption of the 2000 Employee Stock Purchase Plan,
under which 500,000 shares have been reserved.

    On February 2, 2000, the note from shareholders in the amount of $920,000
has been repaid.

                                      F-18

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

                                         SHARES

                                     [LOGO]

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

                                   Prospectus
                                           , 2000

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

                         Banc of America Securities LLC
                               CIBC World Markets
                             Dain Rauscher Wessels

    Until             , 2000 (25 days after the date of this offering), all
dealers that effect transactions in these securities, whether or not
participating in this offering, may be required to deliver a prospectus. This is
in addition to a dealer's obligation to deliver a prospectus when acting as an
underwriter and with respect to unsold allotments or subscriptions.

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

                                    PART II
                    [INFORMATION NOT REQUIRED IN PROSPECTUS]

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

    The following table indicates the expenses to be incurred in connection with
the offering described in this Registration Statement, all of which will be paid
by Vyyo. All amounts are estimates, other than the registration fee, the NASD
filing fee, and the Nasdaq National Market listing fee.


                                                           
SEC Registration fee........................................  $30,360
NASD Filing fee.............................................   12,000
Nasdaq National Market listing fee..........................        *
Accounting fees and expenses................................        *
Legal fees and expenses.....................................        *
Director and officer insurance expenses.....................        *
Printing and engraving expenses.............................        *
Transfer agent fees and expenses............................        *
Blue sky fees and expenses..................................        *
Miscellaneous fees and expenses.............................        *
                                                              -------
  Total.....................................................  $
                                                              =======


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

* To be completed by amendment.

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    Section 102 of the Delaware General Corporation Law, or the DGCL, as
amended, allows a corporation to eliminate the personal liability of directors
of a corporation to the corporation or its stockholders for monetary damages for
a breach of fiduciary duty as a director, except where the director breached his
duty of loyalty, failed to act in good faith, engaged in intentional misconduct
or knowingly violated a law, authorized the payment of a dividend or approved a
stock repurchase in violation of Delaware corporate law or obtained an improper
personal benefit.

    Section 145 of the DGCL provides, among other things, that we may indemnify
any person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding (other than an
action by or in the right of Vyyo) by reason of the fact that the person is or
was a director, officer, agent or employee of Vyyo or is or was serving at our
request as a director, officer, agent, or employee of another corporation,
partnership, joint venture, trust or other enterprise, against expenses,
including attorneys' ties, judgment, fines and amounts paid in settlement
actually and reasonably incurred by the person in connection with the action,
suit or proceeding. The power to indemnify applies (a) if the person is
successful on the merits or otherwise in defense of any action, suit or
proceeding, or (b) if the person acted in good faith and in a manner he
reasonably believed to be in the best interest, or not opposed to the best
interest, of Vyyo, and with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. The power to indemnify
applies to actions brought by or in the right of Vyyo as well, but only to the
extent of defense expenses (including attorneys' fees but excluding amounts paid
in settlement) actually and reasonably incurred and not to any satisfaction of
judgment or settlement of the claim itself, and with the further limitation that
in these actions no indemnification shall be made in the event of any
adjudication of negligence or misconduct in the performance of his duties to
Vyyo, unless the court believes that in light of all the circumstances
indemnification should apply.

                                      II-1

    Section 174 of the DGCL provides, among other things, that a director, who
willfully or negligently approves of an unlawful payment of dividends or an
unlawful stock purchase or redemption, may be held liable for these actions. A
director who was either absent when the unlawful actions were approved or
dissented at the time, may avoid liability by causing his or her dissent to
these actions to be entered in the books containing the minutes of the meetings
of the board of directors at the time the action occurred or immediately after
the absent director receives notice of the unlawful acts.

    Our certificate of incorporation includes a provision that eliminates the
personal liability of its directors for monetary damages for breach of fiduciary
duty as a director, except for liability:

    - for any breach of the director's duty of loyalty to Vyyo or its
      stockholders;

    - for acts or omissions not in good faith or that involve intentional
      misconduct or a knowing violation of law;

    - under the section 174 of the DGCL regarding unlawful dividends and stock
      purchases; or

    - for any transaction from which the director derived an improper personal
      benefit.

    These provisions are permitted under Delaware law.

    Our bylaws provide that:

    - we must indemnify our directors and officers to the fullest extent
      permitted by Delaware law;

    - we may indemnify our other employees and agents to the same extent that we
      indemnified our officers and directors, unless otherwise determined by our
      board of directors; and

    - we must advance expenses, as incurred, to our directors and executive
      officers in connection with a legal proceeding to the fullest extent
      permitted by Delaware Law.

    The indemnification provisions contained in our certificate of incorporation
and bylaws are not exclusive of any other rights to which a person may be
entitled by law, agreement, vote of stockholders or disinterested directors or
otherwise. In addition, we maintain insurance on behalf of our directors and
executive officers insuring them against any liability asserted against them in
their capacities as directors or officers or arising out of this status.

    We intend to enter into agreements to indemnify our directors and executive
officers, in addition to indemnification provided for in our bylaws. These
agreements, among other things, will provide for indemnification of our
directors and executive officers for expenses, judgments, fines and settlement
amounts incurred by any such person in any action or proceeding arising out of
the person's services as a director or executive officer or at our request. We
believe that these provisions and agreements are necessary to attract and retain
qualified persons as directors and executive officers.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.

    Since February 1, 1997, the Registrant has sold and issued the following
unregistered securities. The share numbers and per share prices below reflect
(1) the two-for-one stock split of the outstanding common stock effected on
February 13, 1998, and (2) the one-for-five reverse stock split of the
outstanding common stock effected on January 3, 2000 and the conversion of all
outstanding shares of preferred stock into shares of common stock that will
occur automatically upon the closing of this offering:

 (1) Between February 1, 1997 and October 26, 1998, the Registrant granted stock
     options under the Registrant's 1996 Equity Incentive Plan to a total of 76
     officers, employees, directors and consultants of the Registrant, to
     purchase an aggregate of 188,144 shares of common stock, at a weighted
     average exercise price of $2.46 per share. On October 27, 1998, the
     Registrant amended these options to have an exercise price of $0.50 per
     share. Since October 27, 1998, the Registrant

                                      II-2

     granted stock options under the Registrant's 1996 Equity Incentive Plan to
     a total of 38 officers, employees, directors and consultants of the
     Registrant, to purchase an aggregate of 145,497 shares of common stock, at
     a weighted average exercise price of $0.50 per share.

 (2) Since February 1, 1997, the Registrant has granted stock options under the
     Registrant's 1999 Employee and Consultant Equity Incentive Plan to a total
     of 27 officers, employees, directors and consultants of the Registrant, to
     purchase an aggregate of 1,386,000 shares of common stock, at a weighted
     average exercise price of $0.75 per share.

 (3) Since February 1, 1997, the Registrant has granted stock options under the
     Registrant's 2000 Employee and Consultant Equity Incentive Plan to a total
     of ____________ officers, employees, directors and consultants of the
     Registrant, to purchase an aggregate of ____________ shares of common
     stock, at a weighted average exercise price of $____________ per share.

 (4) At various times from March 31, 1997 through July 17, 1997, the Registrant
     sold and issued 56,930 shares of common stock at $2.45 per share to 5
     investors for an aggregate cash consideration of $139,478.50.

 (5) At various times from March 31, 1997 through July 17, 1997, the Registrant
     sold and issued 142,325 shares of Series A Convertible Preferred Stock at
     $8.79 per share to 5 investors for an aggregate cash consideration of
     $1,251,036.75.

 (6) At various times from April 1, 1997 through August 28, 1997, the Registrant
     sold and issued 23,936 shares of common stock at $2.45 per share to 13
     investors who were not U.S. Persons for an aggregate cash consideration of
     $58,645.16.

 (7) At various times from April 1, 1997 through August 28, 1997, the Registrant
     sold and issued 59,842 shares of Series A Convertible Preferred Stock at
     $8.79 per share to 13 investors who were not U.S. Persons for an aggregate
     cash consideration of $526,011.18.

 (8) From April 9, 1997 through April 16, 1997, the Registrant sold and issued
     warrants to purchase an aggregate of 41,000 shares of common stock (the
     "1997 Warrants") to 2 investors at an exercise price of $2.45 with an
     aggregate exercise price of $100,450.

 (9) On June 17, 1997, the Registrant sold and issued 340 shares of common stock
     and 850 shares of Series A Convertible Preferred Stock to Joseph Gorodnick
     in exchange for all of his ordinary shares in Vyyo Ltd.

(10) From September 30, 1997 through November 10, 1997, the Registrant sold and
     issued warrants to purchase an aggregate of 244,897 shares of common stock
     (the "1997 Warrants") to 6 investors at an exercise price of $11.88 with an
     aggregate exercise price of $2,908,154.25

(11) On November 18, 1997, the Registrant sold and issued an aggregate of 97
     shares of common stock and 242 shares of Series A Convertible Preferred
     Stock to 4 investors in exchange for all of their ordinary shares in
     Vyyo Ltd.

(12) On December 29, 1997, the Registrant sold and issued 1997 Series A-2
     Promissory Notes (the "Registrant 1997 Series A-2 Notes") to 14 investors
     in the aggregate principal amount of $278,400, which were convertible into
     18,560 shares of Series A Convertible Preferred Stock at a conversion price
     of $15.00 per share.

(13) On December 29, 1997, Vyyo Ltd sold and issued 1997 Series A-2 Promissory
     Notes (the "Ltd 1997 Series A-2 Notes" to 6 investors in the aggregate
     principal amount of $176,320, which were convertible into 11,754 shares of
     Registrant's Series A Convertible Preferred Stock at a conversion price of
     $15.00 per share.

                                      II-3

(14) On December 22, 1997, the Registrant sold and issued 1997 Series A-2
     Warrants (the "1997 Series A-2 Warrants") to purchase an aggregate of
     48,000 shares of Common stock to 20 investors at an exercise price of
     $14.25 with an aggregate exercise price of $684,000.

(15) On February 3, 1998, the Registrant sold and issued 1998 Series A-1
     Promissory Notes (the "Registrant 1998 Series A-1 Notes") to 13 investors
     in the aggregate principal amount of $259,840, which were convertible into
     17,322 shares of Series A Convertible Preferred Stock at a conversion price
     of $15.00 per share.

(16) On February 3, 1998, Vyyo Ltd sold and issued 1998 Series A-1 Promissory
     Notes (the "Ltd 1998 Series A-1 Notes") to 6 investors in the aggregate
     principal amount of $157,760, which were convertible into 10,517 shares of
     Registrant's Series A Convertible Preferred Stock at a conversion price of
     $15.00 per share.

(17) On February 3, 1998, the Registrant sold and issued 1998 Series A-1
     Warrants (the "1998 Series A-1 Warrants") to purchase an aggregate of
     43,200shares of Common stock to 19 investors at an exercise price of $14.25
     with an aggregate exercise price of $615,600.

(18) On February 6, 1998, pursuant to a settlement agreement, the Registrant
     sold and issued 8,298 shares of common stock and 20,744 of Series A
     Convertible Preferred Stock to Yotam Financing Technological Ventures Ltd.
     for an aggregate cash consideration of $20,744.

(19) On February 26, 1998, the Registrant sold and issued 1998 Series A-2
     Promissory Notes (the "Registrant 1998 Series A-2 Notes") to 15 investors
     in the aggregate principal amount of $765,600, which were convertible into
     51,040 shares of Series A Convertible Preferred Stock at a conversion price
     of $15.00 per share.

(20) On February 26, 1998, Vyyo Ltd sold and issued 1998 Series A-2 Promissory
     Notes (the "Ltd 1998 Series A-2 Notes") to 5 investors in the aggregate
     principal amount of $473,280, which were convertible into 31,552 shares of
     Registrant's Series A Convertible Preferred Stock at a conversion price of
     $15.00 per share.

(21) On February 26, 1998, the Registrant sold and issued 1998 Series A-2
     Warrants (the "1998 Series A-2 Warrants") to purchase an aggregate of
     128,160 shares of Common stock to 20 investors at an exercise price of
     $14.25 with an aggregate exercise price of $1,826,280.

(22) On June 30, 1998, the Registrant sold and issued 1998 Series B-1 Promissory
     Notes (the "Registrant 1998 Series B-1 Notes") to 27 investors in the
     aggregate principal amount of $3,679,329.09. These notes were convertible
     into shares of Common stock at a conversion price equal to $7.50 if the
     notes convert before September 15, 1998, or after September 15, 1998 the
     greater of $7.50 or one third of the per share price of Registrant's Common
     stock resulting from either an initial public offering of its common stock
     or a merger of Registrant with another.

(23) On June 30, 1998, the Vyyo Ltd. sold and issued 1998 Series B-1 Promissory
     Notes (the "Ltd 1998 Series B-1 Notes") to 7 investors in the aggregate
     principal amount of $1,032,355.20. These notes were convertible into shares
     of Registrant's common stock at a conversion price equal to $7.50 if the
     notes convert before September 15, 1998, or after September 15, 1998 the
     greater of $7.50 or one third of the per share price of Registrant's common
     stock resulting from either an initial public offering of Registrant's
     common stock or a merger of Registrant with another entity.

(24) On June 30, 1998, the Registrant sold and issued 1998 Series B-1 Warrants
     (the "1998 Series B-1 Warrants") to 34 investors to purchase the number of
     shares of common stock equal to the sum of the principal amount of each
     investor's Registrant 1998 Series B-1 Note or Ltd 1998 Series B-1 Note
     multiplied by .35 divided by the conversion price of each investors
     applicable 1998 Series B-1 Note.

                                      II-4

(25) On September 28, 1998, the Registrant sold and issued 1,198,906 shares of
     common stock at $1.00 per share to 9 investors for an aggregate cash
     consideration of $1,198,906.

(26) On November 11, 1998, the Registrant sold and issued 152 shares of common
     stock and 379 shares of Series A Convertible Preferred Stock to Shlomo
     Rachiv in exchange for all of his ordinary shares in Vyyo Ltd.

(27) On December 1, 1998, the Registrant sold and issued 629,447 shares of
     Series B Convertible Preferred Stock at $1.00 per share to 25 investors for
     an aggregate cash consideration of $629,447.

(28) On December 1, 1998, the Registrant sold and issued 1998 Series B-3
     Warrants (the "1998 Series B-3 Warrants") to 25 investors to purchase up to
     the number of shares of common stock equal to the sum of the number of
     shares of Series B Convertible Preferred Stock each investor purchased
     multiplied by 0.6. The 1998 Series B-3 Warrants would not be exercisable
     for any shares if the Registrant obtained financing in the amount of
     $2,000,000 on or before June 30, 1999.

(29) On December 1, 1998, Registrant amended the 1997 Series A-2 Notes, 1998
     Series A-1 Notes, 1998 Series A-2 Notes and 1998 Series B-1 Notes in the
     aggregate principal amount of $4,464,779.83 held by 20 purchasers of
     Series B Convertible Preferred Stock such that these notes became
     convertible into an aggregate of 4,464,779 shares of Series B Convertible
     Preferred Stock at a conversion price of $1.00 per share at the election of
     the purchasers (the "1998 Amended Notes").

(30) On May 31, 1999, the Registrant sold and issued 5,986,437 shares of common
     stock at $0.75 per share to two investors for an aggregate cash
     consideration of $4,489,828.05.

(31) On June 2, 1999, the Registrant sold and issued a warrant to purchase an
     aggregate of 89,286 shares of common stock to Yehuda Atai at an exercise
     price of $0.75per share with an aggregate exercise price of $63,750.

(32) On June 25, 1999, the Registrant sold and issued 64,000 shares of common
     stock at $1.25 per share to Pezzola & Reinke, APC for the cancellation of
     debt in the aggregate amount of $80,000.

(33) On August 31, 1999, the Registrant sold and issued 9,172,010 shares of
     Series C Convertible Preferred Stock at $0.54 per share to ADC
     Telecommunications, Inc. for an aggregate cash consideration of $4,950,000.

(34) On November 19, 1999, the Registrant amended the 1998 Amended Notes such
     that they became convertible into an aggregate of 1,770,291 shares of
     common stock at a conversion price of $1.25 per share at the election of
     the holders of the notes.

(35) On December 6, 1999 we amended the exercise price on the 1997 Warrants,
     1997 Series A-2 Warrants, 1998 Series A-1 Warrants, 1998 Series A-2
     Warrants and 1998 Series B-1 Warrants to $0.56 per share.

(36) At various times from December 28, 1999 through January 31, 2000, the
     Registrant sold and issued 733,366 shares of common stock to 58 investors
     upon exercise of warrants at a weighted average exercise price of $2.69 per
     share.

(37) On December 28, 1999, the Registrant sold and issued 5,458,307 shares of
     common stock to 42 investors upon conversion of an aggregate principal
     amount of $6,822,884.29 promissory notes at a conversion price of $1.25 per
     share.

(38) On December 28, 1999, the Registrant sold and issued 178,571 shares of
     Series C Convertible Preferred Stock at $0.56 per share to Arnon Kohavi for
     an aggregate cash consideration of $100,000.

                                      II-5

(39) On December 28, 1999, the Registrant sold and issued 360,000 shares of
     common stock at $1.25 per share to 8 investors for an aggregate cash
     consideration of $450,000.

    The sales of the above securities were deemed to be exempt from registration
under the Securities Act of 1933, as amended (the "Act") in reliance on
Section 4(2) of the Act, Regulation D promulgated under the Act, Regulation S
promulgated under the Act, or Rule 701 promulgated under Section 3(b) of the
Act. In each such transaction, the recipients of securities represented their
intentions to acquire the securities for investment only and not with a view to
or for sale in connection with any distribution thereof, and appropriate legends
were affixed to the securities issued in such transactions.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

  A. EXHIBITS



       EXHIBIT
       NUMBER           DESCRIPTION
- ---------------------   ------------------------------------------------------------
                     
        1.1*            Form of Underwriting Agreement

        3.1             Third Amended and Restated Certificate of Incorporation of
                        the Registrant

        3.2             Amended and Restated Bylaws of the Regstrant

        4.1*            Specimen common stock certificate

        5.1*            Opinion of Skadden, Arps, Slate, Meagher & Flom LLP

       10.1             Form of Indemnification Agreement

       10.2             1996 Equity Incentive Plan

       10.3             1999 Employee and Consultant Equity Incentive Plan

       10.4             Amended and Restated 2000 Employee and Consultant Equity
                        Incentive Plan

       10.5             2000 Employee Stock Purchase Plan

       10.6             Form of Stock Purchase Agreement, dated as of December 28,
                        1999, by and between the Registrant and each of Lewis Broad,
                        Neill Brownstein, Avraham Fischer, Davidi Gilo, John
                        Griffin, Samuel Kaplan, Alan Zimmerman

       10.7             Form of D97 Series A Preferred Stock Purchase Agreement by
                        and between the Registrant and each of the purchasers of the
                        Series A Preferred Stock.

       10.8             Form of D98 Series B Preferred Stock Purchase Agreement by
                        and between the Registrant and each of the purchasers of the
                        Series B Preferred Stock

       10.9*            Series C Preferred Stock Purchase Agreement, dated as of
                        August 13, 1999, by and between the Registrant and ADC
                        Telecommunications, Inc.

       10.10*           Series C Preferred Stock Purchase Agreement, dated as of
                        December 28, 1999, by and between the Registrant and Arnon
                        Kohavi


                                      II-6




       EXHIBIT
       NUMBER           DESCRIPTION
- ---------------------   ------------------------------------------------------------
                     
       10.11*           Registration Rights and Lock-Up Agreement dated as of
                        April 21, 1996, by and among the Registrant and certain
                        holders of the Series A Preferred Stock and Series C
                        Preferred Stock

       10.12*           Amendment to Registration Rights and Lock-Up Agreement,
                        dated as of August 6, 1999, by and among the Registrant and
                        certain holders of the Series A Preferred Stock and
                        Series C Preferred Stock

       10.13            Employment Agreement with Davidi Gilo

       10.14            Employment Agreement with Eran Pilovsky

       10.15            Employment Agreement with Stephen P. Pezzola

       10.16            Employment Agreement with Michael Corwin

       10.17            Employment Agreement with Arnon Kohavi

       10.18*           Unprotected Lease Agreement, dated as of March 7, 1999
                        between Vyyo Ltd. and Ayalot Investments in Properties (Har
                        Hotzvim) 1994 Ltd.

       10.19+           Collaboration Agreement, dated August 6, 1999, between Vyyo
                        Ltd. and ADC Telecommunications, Inc.

       10.20+           License and Development Agreement, dated as of December
                        1999, by and between Philips Semiconductor, Inc., Vyyo Ltd.,
                        and the Registrant

       21.1             Subsidiaries of the Registrant

       23.1             Consent of Ernst & Young LLP, Independent Auditors

       23.2*            Consent of Skadden, Arps, Slate, Meagher & Flom LLP
                        (included in Exhibit 5.1)

       24.1             Power of Attorney (See page II-9)

       27.1             Financial Data Schedule


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

*   Documents to be filed by amendment.

+   We have sought confidential treatment from the Commission for selected
    portions of this exhibit. The omitted portions will be separately filed with
    the Commission.

  B. FINANCIAL STATEMENT SCHEDULES

ITEM 17. UNDERTAKINGS.

    The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing specified in the underwriting agreements, certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.

    Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers, and controlling persons of the
registrant pursuant to the provisions described in Item 14, or otherwise, the
registrant has been informed that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is therefore unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer, or controlling
person of the registrant in the successful defense of any action, suit, or
proceeding) is

                                      II-7

asserted by such director, officer, or controlling person in connection with the
securities being registered, the registrant will, unless in the opinion of its
counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.

THE UNDERSIGNED REGISTRANT HEREBY UNDERTAKES THAT:

(1) For purposes of determining any liability under the Securities Act of 1933,
    the information omitted from the form of prospectus filed as part of this
    registration statement in reliance upon Rule 430A and contained in a form of
    prospectus filed by the registrant under Rule 424(b) (1) or (4) or 497
    (h) under the Securities Act shall be deemed to be part of this registration
    statement as of the time it was declared effective.

(2) For the purpose of determining any liability under the Securities Act of
    1933, each post-effective amendment that contains a form of prospectus shall
    be deemed to be a new registration statement relating to the securities
    offered therein, and the offering of such securities at that time shall be
    deemed to be the initial bonafide offering thereof.

                                      II-8

                                   SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Cupertino, State of
California, on February 3, 2000.


                                                      
                                                       VYYO INC.

                                                       BY:               /S/ DAVIDI GILO
                                                            -----------------------------------------
                                                                           Davidi Gilo
                                                                     Chief Executive Officer
                                                                    and Chairman of the Board


    Each person whose signature appears below hereby constitutes and appoints
Davidi Gilo, Lewis S. Broad and Neill H. Brownstein, and each of them, his true
and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place, and stead, in any and all
capacities, to sign any and all (i) amendments (including post-effective
amendments) and additions to this Registration Statement and (ii) Registration
Statements, and any and all amendments thereto (including post-effective
amendments), relating to the offering contemplated pursuant to Rule 462(b) under
the Securities Act of 1933, and to file the same, with all exhibits thereto, and
other documents in connection therewith, with the Securities and Exchange
Commission, and hereby grants to such attorneys-in-fact and agents full power
and authority to do and perform each and every act and thing requisite and
necessary to be done, as fully to all intents and purposes as he or she might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or his substitute or substitutes may lawfully do or
cause to be done by virtue hereof.

    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.



                  SIGNATURE                                   TITLE                        DATE
                  ---------                                   -----                        ----
                                                                               
               /s/ DAVIDI GILO                 Chief Executive Officer and Chairman
    ------------------------------------         of the Board                        February 3, 2000
                 Davidi Gilo                     (Principal Executive Officer)

                                               Vice President, Finance and
              /s/ ERAN PILOVSKY                  Chief Financial Officer
    ------------------------------------         (Principal Financial and            February 3, 2000
                Eran Pilovsky                    Accounting Officer)

             /s/ LEWIS S. BROAD                Director
    ------------------------------------                                             February 3, 2000
               Lewis S. Broad

           /s/ NEILL H. BROWNSTEIN             Director
    ------------------------------------                                             February 3, 2000
             Neill H. Brownstein

             /s/ JOHN P. GRIFFIN               Director
    ------------------------------------                                             February 3, 2000
               John P. Griffin


                                      II-9




                  SIGNATURE                                   TITLE                        DATE
                  ---------                                   -----                        ----
                                                                               
             /s/ AVRAHAM FISCHER               Director
    ------------------------------------                                             February 3, 2000
               Avraham Fischer

            /s/ SAMUEL L. KAPLAN               Director
    ------------------------------------                                             February 3, 2000
              Samuel L. Kaplan

            /s/ ALAN L. ZIMMERMAN              Director
    ------------------------------------                                             February 3, 2000
              Alan L. Zimmerman


                                     II-10

                                 EXHIBIT INDEX



       EXHIBIT
       NUMBER           DESCRIPTION
- ---------------------   ------------------------------------------------------------
                     
        3.1             Third Amended and Restated Certificate of Incorporation of
                        the Registrant

        3.2             Amended and Restated Bylaws of the Registrant

       10.1             Form of Indemnification Agreement

       10.2             1996 Equity Incentive Plan

       10.3             1999 Employee and Consultant Equity Incentive Plan

       10.4             Amended and Restated 2000 Employee and Consultant Equity
                        Incentive Plan

       10.5             2000 Employee Stock Purchase Plan

       10.6             Form of Stock Purchase Agreement, dated as of December 28,
                        1999, by and between the Registrant and each of Lewis Broad,
                        Neill Brownstein, Avraham Fischer, Davidi Gilo, John
                        Griffin, Samuel Kaplan, Alan Zimmerman

       10.7             Form of D97 Series A Preferred Stock Purchase Agreement by
                        and between the Registrant and each of the purchasers of the
                        Series A Preferred Stock.

       10.8             Form of D98 Series B Preferred Stock Purchase Agreement, by
                        and between the Registrant and each of the purchasers of the
                        Series B Preferred Stock

       10.13            Employment Agreement with Davidi Gilo

       10.14            Employment Agreement with Eran Pilovsky

       10.15            Employment Agreement with Stephen P. Pezzola

       10.16            Employment Agreement with Michael Corwin

       10.17            Employment Agreement with Arnon Kohavi

       10.19+           Collaboration Agreement, dated August 6, 1999, between Vyyo
                        Ltd. and ADC Telecommunications, Inc.

       10.20+           License and Development Agreement, dated as of December   ,
                        1999, by and between Philips Semiconductors Inc., Vyyo Ltd.,
                        and the Registrant

       21.1             Subsidiaries of the Registrant

       23.1             Consent of Ernst & Young LLP, Independent Auditors

       24.1             Power of Attorney (See page II-9)

       27.1             Financial Data Schedule


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

+   We have sought confidential treatment from the Commission for selected
    portions of this exhibit. The omitted portions will be separately filed with
    the Commission.