RADYNE COMSTREAM INC
424B3, 1999-10-07
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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<PAGE>

PROSPECTUS

                             RADYNE COMSTREAM INC.
                                4,745,076 SHARES
                   OF COMMON STOCK, PAR VALUE $.002 PER SHARE
                                      AND
                         4,745,076 SUBSCRIPTION RIGHTS

<TABLE>
<CAPTION>

<S>                                                    <C>                      <C>
                                                             PER SHARE                  TOTAL
                                                               -----                 -----------

Subscription price...................................          $3.73                 $17,699,133

Underlying discount..................................            N/A                         N/A
                                                               -----                 -----------
     Total proceeds to Radyne........................          $3.73                 $17,699,133
</TABLE>

THE SUBSCRIPTION RIGHTS

      Each Radyne ComStream shareholder of record on April 16, 1999 will be
      entitled to purchase four shares of common stock for every five shares
      currently owned.

      The purchase price per share is $3.73.

      The subscription rights expire at 5:00 p.m. New York time on November 15,
      1999, unless extended.

THE COMMON STOCK

      One share is issuable upon the exercise of one subscription right.

      Voting rights for the new shares will be equal to the voting rights of
      shares currently outstanding.

THE OFFERING

      You cannot revoke a decision to exercise.

RADYNE COMSTREAM'S COMMON STOCK IS CURRENTLY TRADED OVER THE COUNTER AND IS NOT
LISTED ON ANY SECURITIES EXCHANGE OR QUOTED ON NASDAQ.

                         ------------------------
YOU SHOULD CAREFULLY CONSIDER THE RISK FACTORS ON PAGE 7 BEFORE PURCHASING ANY
OF THE COMMON STOCK. THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY
THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR
HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.

                         ------------------------
               THE DATE OF THIS PROSPECTUS IS SEPTEMBER 30, 1999




<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

     Radyne ComStream Inc. is subject to the information requirements of the
Securities Exchange Act of 1934, as amended (the 'Exchange Act') and files
reports and other information with the Securities and Exchange Commission. You
may read and copy any reports or other information concerning Radyne ComStream
at the SEC's public reference rooms in Washington, D.C., New York, New York and
Chicago, Illinois. You may also request copies of these documents upon payment
of a duplicating fee, by writing to the SEC's Public Reference Section. Please
call the SEC at l-800-SEC-0330 for further information on the public reference
rooms. Radyne ComStream's SEC filings are also available to the public from
commercial document retrieval services and at the web site maintained by the SEC
at 'http://www.sec.gov.' Information concerning Radyne ComStream is not
available from any securities exchange as our common stock is not traded on any
securities exchange.

     Radyne ComStream filed a registration statement with respect to the shares
of common stock and rights to purchase the common stock we are offering.
Pursuant to SEC rules and regulations, this prospectus does not contain all of
the information that you can find in such registration statement. You may read
and copy this information in the same way as any other information that Radyne
ComStream files with the SEC.

     Statements in this document concerning any document filed as an exhibit to
the registration statement summarize all material provisions. Each of those
statements is qualified in its entirety by reference to the complete document.
For more detailed information, you should refer to the copy of the complete
document filed as an exhibit to the registration statement. These documents,
filed with the SEC, may be inspected and copied, and obtained by mail, from the
SEC as set forth above and will be available for inspection and copying at the
principal executive offices of Radyne ComStream at 3138 East Elwood Street,
Phoenix, AZ 85034 during regular business hours by any interested securityholder
of Radyne ComStream or his or her representative who has been so designated in
writing.

     The SEC allows us to 'incorporate by reference' information into this
document, which means that we can disclose important information to you by
referring you to another document filed separately with the SEC, including
Radyne ComStream's annual, quarterly and current reports. The information
incorporated by reference is deemed to be part of this document, except for any
information superseded by information in this document. The information
incorporated by reference is an important part of this prospectus.

     This document incorporates by reference the documents set forth below which
Radyne ComStream previously filed with the SEC. These documents contain
important information about Radyne ComStream and its finances.

     Radyne ComStream incorporates by reference into this Prospectus:

      its Annual Report on Form 10-K/A for the Fiscal Year Ended December 31,
      1998, which contains audited consolidated financial statements for Radyne
      ComStream's latest fiscal year;

      its quarterly report on Form 10-Q/A for the quarter ended June 30, 1999;

      its quarterly report on Form 10-Q/A for the quarter ended March 31, 1999;

      its quarterly report on Form 10-Q/A for the quarter ended June 30, 1998;

      its report on Form 8-K/A filed on May 5, 1999, which contains audited
      financial statements of ComStream Holdings, Inc. for its fiscal years
      ended December 31, 1995, 1996 and 1997, unaudited financial statements of
      ComStream Holdings, Inc. for the nine months ended September 30, 1998, and
      pro forma financial information for the year ended December 31, 1997 and
      the nine months ended September 30, 1998 as if the acquisition of
      ComStream Holdings, Inc. took place effective January 1, 1997; and

      the description of Radyne ComStream's common stock, $.002 par value, as
      contained in its registration statement on Form 8-A, filed with the SEC on
      March 8, 1984, as amended on July 25, 1988.





<PAGE>

     Copies of our Annual Report on Form 10-K/A for the year ended December 31,
1998 and our quarterly report on Form 10-Q/A for the quarter ended June 30, 1999
accompany this prospectus. Other documents incorporated by reference may be
obtained through the SEC and are available from Radyne ComStream without charge,
other than exhibits, unless we have specifically incorporated by reference an
exhibit in this document. You may obtain documents incorporated by reference in
this document by making a request to Radyne ComStream by telephone at
(602) 437-9620 or in writing at the following address:

                Director of Administration
                Radyne ComStream Inc.
                3138 East Elwood Street
                Phoenix, AZ 85034

     You should rely only on the information contained in this document or to
which we have referred you. We have not authorized anyone to provide you with
information that differs from such information. We are not making an offer of
these securities in any state where the offer is not permitted. You should not
assume that the information in this prospectus or any prospectus supplement is
accurate as of any date other than the date on the front of those documents.

                                       2




<PAGE>

                                    SUMMARY

     The following summary is qualified in its entirety by reference to the more
detailed information and financial statements and notes thereto appearing
elsewhere in this prospectus.

                             RADYNE COMSTREAM INC.

     Radyne ComStream Inc. and its subsidiaries design, manufacture and sell
equipment used to receive data from, and transmit data to, satellites. We have
engaged in the advanced design and production of digital data communications
equipment for satellite telecommunications systems for over seventeen years.

     Singapore Technologies Pte Ltd through its wholly owned subsidiary, Stetsys
Pte Ltd, and the latter's wholly owned subsidiary, Stetsys US, Inc.,
collectively, ST, owns approximately 91% of Radyne ComStream's common stock.

                              RECENT DEVELOPMENTS

     Consistent with our new growth strategy, on October 15, 1998 we acquired
ComStream Holdings, Inc. from Spar Aerospace Limited, a Canadian company.
ComStream is an international provider of digital transmission solutions for
voice, data, audio and video applications with offices in the United States,
Singapore, Indonesia, China and the United Kingdom. We acquired ComStream in an
effort to expand our core business, supplement our product lines and take
advantage of ComStream's trademark and distribution channels, and based on our
belief that the combined companies could realize certain synergies.

     The integration of ComStream into our ongoing operations has proceeded
essentially as planned, resulting in revenues of $25,000,000 and an operating
profit of $1,203,000 for the six months ended June 30, 1999. After interest
expense of $1,098,000, net income for the six-month period was $105,000. Our
results for the quarter ended June 30, 1999 were even better: income from
operations of $965,000 and net income of $422,000. We will apply the proceeds of
this offering to reduce our debt and, thus, our interest expense in subsequent
periods. Of course, there is no assurance that our operating results will
continue to improve.

     Our Compensation Committee and Board of Directors recently determined to
recognize the significant achievements of our senior management in effecting the
ComStream integration by awarding bonuses of $203,900 to Robert C. Fitting,
Chief Executive Officer, $98,900 to Steven Eymann, Chief Technical Officer and
$46,700 to Garry Kline, Chief Financial Officer. In addition, to further the
goal of providing senior management an equity stake in the company, the
Compensation Committee and the Board adopted a plan which will permit them to
borrow funds from the company for the purpose of exercising stock options.
Messrs. Fitting, Eymann and Kline will be able to borrow up to $200,000, $100,00
or $50,000, respectively. If the borrower continues to be employed by Radyne
ComStream, we will forgive one-half of each loan (including interest at 5% per
annum) on the first and second anniversaries of the loan and provide sufficient
bonus compensation at those times to enable the employee to satisfy the
resulting income tax obligation.

               PURPOSE OF THE RIGHTS OFFERING AND USE OF PROCEEDS

     We intend to raise approximately $17,700,000 in gross proceeds from the
rights offering to repay ST for the $10,000,000 of financing which it provided
in connection with the ComStream acquisition and approximately $5,618,000 in
principal amount from earlier working capital loans, plus interest. We expect to
receive approximately $16 million of the aggregate $17,700,000 gross proceeds of
the offering from ST upon the exercise of its rights.

     If we complete the rights offering, the maximum gross proceeds to Radyne
ComStream would be approximately $17,700,000 before payment of related fees and
expenses estimated to be $300,000. However, although ST informed us that it
intends to fully exercise its rights, we do not

                                       3





<PAGE>

know the extent to which others will exercise the rights that they receive. We
will not reoffer shares underlying any unexercised rights to the public or
otherwise reissue them. Therefore, the actual proceeds from the rights offering
could be somewhat less.

     The Board of Directors has established the subscription price at $3.73 per
share, which the Board determined to be the fair market value of the common
stock based on the negotiated conversion price of the convertible note issued to
Spar in connection with the ComStream acquisition. See 'Purpose of the Rights
Offering and Use of Proceeds.'

                         SUMMARY OF THE RIGHTS OFFERING

<TABLE>
<S>                                            <C>
The rights...................................  Radyne ComStream will issue to you four rights for
                                               every five shares of common stock that you held on the
                                               record date. We will distribute an aggregate of
                                               approximately 4,745,076 rights. Holders of the rights may
                                               purchase one share of common stock for each right that
                                               they exercise at the subscription price. We will not issue
                                               any fractional rights. Each right will entitle a shareholder
                                               to purchase one share of common stock at $3.73 per
                                               share.
Subscription price...........................  $3.73 per share of common stock.
Record date..................................  April 16, 1999
Transferability of shareholder rights........  The rights will be transferable, but we do not anticipate
                                               that there will be a market in the rights or that any
                                               exchange will list them for trading.
Expiration date..............................  5:00 p.m., New York time, on November 15, 1999 unless the
                                               Board of Directors determines that a material event has
                                               occurred that necessitates one or more extensions of the
                                               expiration date to permit adequate disclosure of information
                                               concerning such event.
Procedure for exercising rights..............  You may exercise rights by properly completing the
                                               subscription certificate evidencing your rights and
                                               forwarding the subscription certificate to the subscription
                                               agent or Radyne ComStream on or prior to the expiration
                                               date, together with payment in full of the subscription
                                               price with respect to your rights. In the alternative, you
                                               may use the guaranteed delivery procedures described below.
                                               If you use the mail to forward subscription certificates, we
                                               recommended that you use insured, registered mail. If time
                                               does not permit a holder of a right to deliver a
                                               subscription certificate to the subscription agent or Radyne
                                               ComStream on or before the expiration date, such person
                                               should make use of the guaranteed delivery procedures
                                               described under 'The Rights Offering -- Exercise of rights.'
                                               THE EXERCISE OF RIGHTS IS IRREVOCABLE ONCE MADE. RADYNE
                                               COMSTREAM WILL NOT PAY INTEREST ON THE MONEY DELIVERED IN
                                               PAYMENT OF THE SUBSCRIPTION PRICE. If paying by uncertified
                                               personal check, please note that the funds paid thereby may
                                               take at least five business days to clear. Accordingly, we
                                               urge persons who wish to pay the
</TABLE>

                                       4





<PAGE>


<TABLE>
<S>                                            <C>
                                               subscription price by means of uncertified personal check to
                                               make payment sufficiently in advance of the expiration date
                                               to ensure that such payment reaches the subscription agent
                                               or Radyne ComStream and clears by such date. We urge you to
                                               consider payment by means of certified or cashier's check or
                                               money order. You may not exercise a right in part, and
                                               Radyne ComStream will not issue any fractional shares.
Persons holding shares, or wishing to
  exercise rights, through others............  Persons who hold their Radyne ComStream Inc. shares and
                                               rights with a broker, dealer, commercial bank, trust company
                                               or other nominee should contact the appropriate institution
                                               or nominee and request it to effect the transactions for
                                               them.
Issuance of common stock.....................  Radyne ComStream will cause the delivery of certificates
                                               representing shares of common stock issuable upon exercise
                                               of rights to the holder of such rights as soon as
                                               practicable after valid exercise of such rights. The
                                               subscription agent will hold funds received thereby until
                                               the issuance of the related shares.
Subscription agent...........................  Continental Stock Transfer & Trust Company
Information..................................  Please direct any questions regarding this offering,
                                               including the procedure for exercising rights, and requests
                                               for additional copies of this prospectus, the subscription
                                               certificate or the notice of guaranteed delivery to Radyne
                                               ComStream Inc. at 3138 East Elwood Street, Phoenix, Arizona
                                               85034, Attention: Director of Administration. Telephone:
                                               (602) 437-9620.
Maximum shares of common stock outstanding
  after the rights offering..................  10,704,954 shares based on 5,959,878 shares outstanding on
                                               June 30, 1999. Does not give effect to the 2,040,461 shares
                                               reserved for issuance upon the exercise of options
                                               previously granted or available for grant from time to time
                                               under our 1996 Incentive Stock Option Plan, 1,000,000 shares
                                               reserved for issuance under our 1999 Employee Stock Purchase
                                               Plan or the possible conversion of an outstanding
                                               convertible note into an additional 968,843 shares.
</TABLE>

     For more information regarding this offering, including the procedure for
exercising rights, see 'The Rights Offering.'

                        FEDERAL INCOME TAX CONSEQUENCES

     The holders of common stock will not recognize taxable income for federal
income tax purposes upon receipt of the rights and holders of the rights will
not recognize any gain or loss upon exercise of the rights. See 'Federal Income
Tax Consequences' for a discussion of tax consequences that investors should
consider in connection with this offering.

                                       5





<PAGE>

                                  RISK FACTORS

     The purchase of common stock in the rights offering or the purchase of
rights in the secondary market involves investment risks relating to Radyne
ComStream, to the satellite data communications equipment industry in general
and to this offering. Investors should read and consider carefully the
information set forth under the heading 'Risk Factors.'

                               EXERCISE OF RIGHTS

     The Board of Directors of Radyne ComStream makes no recommendation to
holders as to whether a holder should exercise rights to purchase shares of
common stock in the rights offering. In addition, the Board makes no
recommendation as to whether you should purchase rights.

                                       6




<PAGE>

                                  RISK FACTORS

     An investment in the common stock or rights is highly speculative and
involves a high degree of risk. You should invest in these securities only if
you can afford the loss of your entire investment. Prior to making an investment
decision, you should carefully consider, together with the other matters
referred to in this prospectus, or incorporated by reference, the following risk
factors.

WE HAVE A HISTORY OF OPERATING LOSSES AND WE MAY NEVER BECOME PROFITABLE

     Radyne ComStream incurred losses from operations of $13,362,000 during the
year ended December 31, 1998, $1,080,000 during the year ended December 31,
1997, $1,814,000 during the six months ended December 31, 1996 and $2,368,000
during the twelve months ended June 30, 1996. The Company's predecessor, Radyne
Corp., had emerged from Chapter 11 protection in December 1994. Radyne ComStream
has been largely dependent upon loans from controlling shareholders to satisfy
its working capital requirements. Accordingly, one must consider the likelihood
of Radyne ComStream's future success in light of Radyne Corp.'s bankruptcy in
1994 and the possibility of future operating losses, as well as the problems,
expenses, difficulties, risks and complications frequently encountered in
connection with similarly situated companies. In addition, our future plans for
Radyne ComStream are subject to known and unknown risks and uncertainties that
may cause Radyne ComStream's actual results in future periods to differ
materially from any future performance implied in this Prospectus or in our
Annual Report.

OUR DEPENDENCE ON ST FOR CAPITAL AND THE FACT THAT SOME OF OUR LOANS ARE
CALLABLE COULD ADVERSELY AFFECT OUR FINANCIAL HEALTH AND OUR ABILITY TO REACT TO
CHANGES IN OUR BUSINESS

     Radyne ComStream has been largely dependent on a succession of short-term
loans and guarantees from its controlling shareholder, ST, and affiliates of ST
since it emerged from Chapter 11 protection on December 16, 1994. Prior to its
acquisition by us, ComStream had been dependent on borrowings facilitated by
Spar. At present, Radyne ComStream has short-term indebtedness to ST of
$15,618,272, plus interest, payable on March 31, 2000, and has a $20,500,000
bank line of credit on which it owes approximately $10,320,000. In addition,
Radyne ComStream owes Spar up to $3,614,000 plus interest in connection with the
ComStream acquisition. We will use the proceeds from this offering to repay the
loans from ST. Although Radyne ComStream's indebtedness to the bank or Spar is
not supported by a guarantee or any other form of binding agreement, ST has
provided the bank with a letter of awareness. All loans pursuant to the bank
line of credit are demand loans. The bank could demand repayment at an
inopportune time for Radyne ComStream and ST may not continue indefinitely to
assist Radyne ComStream in maintaining such financing. Moreover, Radyne
ComStream is in violation of a covenant under its bank line requiring Radyne
ComStream to limit its indebtedness to twice its tangible net worth; the bank's
waiver of this violation may expire as early as December 31, 1999. Failure to
realize substantially the anticipated net proceeds of this offering, could
materially adversely affect Radyne ComStream's ability to repay its overall
indebtedness, including its indebtedness to ST, and its financial condition. See
'Purpose of the Rights Offering and Use of Proceeds.'

IF NECESSARY ADDITIONAL FINANCING IS NOT AVAILABLE, OUR COMPETITIVENESS MAY
SUFFER AND OUR PLANS FOR FUTURE GROWTH MAY NOT BE REALIZED

     Based on our operating plan, we believe that in addition to the net
proceeds of this offering, Radyne ComStream will require substantial additional
financing in the next year. Specifically, we will need to pay up to $3,614,000
plus interest to Spar in connection with the ComStream acquisition. Accordingly,
there can be no assurance that our resources will be sufficient to satisfy our
capital requirements for such period. In addition to repaying debt, we
anticipate that we may require additional financing in order to meet our current
plans for expansion. Such financing may take the form of the issuance of common
or preferred equity securities or debt securities, or may involve additional
bank financing. We may be unable to obtain such additional capital on a timely
basis, on favorable terms, or at all.

                                       7





<PAGE>

OUR HEAVY DEPENDENCE ON INTERNATIONAL SALES ENTAILS POTENTIAL VOLATILITY IN OUR
OPERATING RESULTS

     Radyne ComStream has dedicated substantial resources to penetrating markets
in Europe, the Middle East, Canada, Latin America and Asia. While this activity
fits with Radyne ComStream's long-term strategy, recent market volatility in
Latin America and Asia may cause short-term problems which may have longer term
negative effects. Export sales, as a percentage of net sales, were approximately
50% for the year ended December 31, 1998. As a result, the possibility of
substantial future disruptions and the impact of events to date could have a
material adverse effect on our business, financial condition and results of
operations.

IF WE SHOULD BE UNABLE TO RECRUIT OR RETAIN KEY PERSONNEL, OUR ABILITY TO MANAGE
OUR BUSINESS AND KEEP OUR PRODUCTS COMPETITIVE WOULD BE ADVERSELY AFFECTED

     Our future performance is significantly dependent on the continued active
participation of Robert C. Fitting, President and Chief Executive Officer, and
Steve Eymann, Executive Vice President and Chief Technical Officer. Should
either of these key employees leave or otherwise become unavailable to us,
Radyne ComStream's business and results of operations could suffer. Our
continued ability to attract and retain highly skilled personnel is critical to
the operations and expansion of Radyne ComStream. To date, we have been able to
attract and retain the personnel necessary for our operations. However, we may
not be able to do so in the future, particularly as we expand the business. Any
inability to attract and retain personnel with the necessary skills when needed
could materially adversely affect our business and expansion plans.

THE RISK OF OBSOLESCENCE OF OUR PRODUCTS FROM RAPID TECHNOLOGICAL CHANGE
REQUIRES SUBSTANTIAL EXPENDITURES ON PRODUCT IMPROVEMENTS

     The technology used in modems, converters and related equipment changes
rapidly. Radyne ComStream's competitors may succeed in developing or marketing
products or technologies that are more effective and/or less costly and which
render our products obsolete or non-competitive. In addition, new technologies
could emerge that replace or reduce the value of our products. For example, as
more fiber cables come into service, the use of satellites for international
telephony is slowing. Our success will depend in part on our ability to respond
quickly to technological changes through the development and improvement of our
products. Accordingly, we believe that we will need to allocate a substantial
amount of capital to research and development activities in the future. There
can be no assurance that Radyne ComStream's product development efforts will be
successful. Failure to improve our existing products and develop new products
could have a material adverse effect on our business, financial condition and
results of operations.

THE HIGH COST OF RESEARCH AND DEVELOPMENT REDUCES OUR PROFITABILITY

     ComStream's future growth depends on increasing the market share for its
new products, adapting existing satellite communications products to new
applications and introducing new communications products that will find market
acceptance and benefit from Radyne ComStream's established international
distribution channels. Accordingly, we are actively applying our communications
expertise to design and develop new hardware and software products and enhance
existing products. We expended $4,296,000 in the year ended December 31, 1998,
on research and development activities. However, Radyne ComStream may not
continue to have access to sufficient capital to fund the necessary research and
development and such efforts, even if adequately funded, may not prove
successful.

COMPETITION IN OUR INDUSTRY IS INTENSE AND CAN LEAD TO REDUCED SALES AND MARKET
SHARE

     We have a number of major competitors in the satellite communications
field. These include large companies, such as Hughes Network Systems, NEC and
California Microwave which have significantly larger and more diversified
operations and greater financial, marketing, human and other resources than
Radyne ComStream. We believe that we have been able to compete by concentrating
our sales efforts in the international market and by emphasizing product
features and

                                       8





<PAGE>

quality. However, most of our competitors offer products which have one or more
features or functions similar to those offered by Radyne ComStream. We believe
that the quality, performance and capabilities of our products, our ability to
customize certain network functions and the relatively lower overall cost of our
products, as compared to the costs generally offered by Radyne ComStream's major
competitors, have contributed to Radyne ComStream's ability to compete
successfully. However, our major competitors have the resources available to
develop products with features and functions competitive with or superior to
those offered by us. Such competitors may successfully develop such products,
which may prevent us from maintaining a lower cost advantage for our products.
Moreover, we may experience increased competition in the future from these,
other currently unknown competitors or future entrants to the business.

OUR PRODUCTS COULD INFRINGE ON OTHERS' TECHNOLOGY OR VICE VERSA, WHICH COULD BE
COSTLY

     Because patents often provide only narrow protection which may not provide
a competitive advantage in areas of rapid technological change and because
patent applications require public disclosure of information which may otherwise
be subject to trade secret protection, Radyne ComStream has been cautious in
obtaining patents on existing products. We have a number of patents, copyrights
and other intellectual property rights in the form of software and integrated
circuit designs. However, if our technology impermissibly utilizes the
intellectual property of others, Radyne could experience material restrictions
or prohibitions on the use of the technology. In such event, we might need to
obtain licenses from third parties to utilize the patents or proprietary rights
of others. We might be unable to obtain such licenses on acceptable terms or at
all. In addition, in such event, we could incur substantial costs in defending
against infringement claims made by third parties or in enforcing our own
intellectual property rights. It should also be noted that some foreign
countries in which Radyne ComStream's products are sold provide less protection
to intellectual property than do the laws of the United States. Any
misappropriation of Radyne ComStream's products could adversely affect our
business.

INTEGRATING A NEW CORPORATE ENTITY, SUCH AS COMSTREAM, CAN BE EXPENSIVE AND
DISRUPTIVE

     In pursuit of our business strategy, we recently acquired ComStream. The
successful integration of ComStream is subject to risks commonly encountered in
making acquisitions of companies or their services and technologies. Such risks
include, among other things:

      the difficulty associated with assimilating the operations and personnel
      of ComStream

      the potential disruption of our ongoing business,

      the inability of management to maximize our financial and strategic
      position through the successful integration of acquired customers, network
      facilities, technology and distribution networks,

      additional expenses associated with the amortization of acquired
      intangible assets,

      the inability to maintain uniform standards, controls, procedures and
      policies, and

      the impairment of relationships with employees as a result of the
      integration of new management personnel.

ST'S CONTROL OF RADYNE COMSTREAM MAY MAKE OUR STOCK LESS ATTRACTIVE

     Upon the closing of this offering, ST, which currently owns approximately
91% of Radyne ComStream's outstanding common stock, will continue to maintain a
substantially similar level of control. ST will, therefore, continue to have the
ability to elect all of Radyne ComStream's directors and to control the outcome
of all issues submitted to a vote of Radyne ComStream's stockholders. As a
result of ST's substantial ownership interest in the common stock, it may be
more difficult for a third party to acquire Radyne ComStream. A potential buyer
would likely be deterred from any effort to acquire Radyne ComStream absent the
consent of ST or its participation in the transaction. We are subject to Section
912 of the New York Business Corporation Law, which restricts certain business
combinations that are not approved by a corporation's board of directors.

                                       9





<PAGE>

YOU WILL EXPERIENCE IMMEDIATE AND SUBSTANTIAL DILUTION IN LIGHT OF OUR NET
TANGIBLE BOOK VALUE DEFICIENCY

     Upon the closing of this offering, investors will incur immediate and
substantial dilution in the per share net tangible book value of their common
stock. At December 31, 1998, after giving effect to the receipt by Radyne
ComStream of the maximum net proceeds of the rights offering, Radyne ComStream,
would have had a pro forma net tangible book value (deficit) of approximately
($0.24) per share. Net tangible book value is the amount of Radyne ComStream's
total assets minus intangible assets and liabilities. See 'Dilution.'

     To the extent that other shareholders exercise their rights, those
shareholders who do not exercise their rights in full will realize a dilution in
their percentage voting interest and ownership interest in future net earnings,
if any, of Radyne ComStream. Radyne ComStream cannot predict the effect, if any,
this offering will have on the market price of the common stock.

     Radyne ComStream currently has outstanding under the 1996 Incentive Stock
Option Plan options exercisable to purchase an aggregate of 736,976 shares of
common stock at an exercise price of $2.50 per share (in the case of 626,476 of
such options, the optionee/employee would be entitled to a bonus of $1.72 per
share upon exercise), 86,500 shares at $3.125 per share, 50,000 shares at $3.25
per share and 147,375 shares at $3.75 per share. Options on an additional
779,125 shares will become exercisable at between $2.50 and $3.75 per share over
the next three years, assuming that the grantees' employment does not terminate
prematurely. An additional 240,485 shares are available for options yet to be
granted under the Plan. Exercise of the options granted under the 1996 Incentive
Stock Option Plan would further reduce a shareholder's percentage voting and
ownership interest. Moreover, up to 1,000,000 shares may be sold to employees at
85% of fair market value, pursuant to our 1999 Employee Stock Purchase Plan.

THE LARGE NUMBER OF SHARES ELIGIBLE FOR FUTURE SALE MAY ADVERSELY AFFECT OUR
MARKET PRICE

     The sale, or availability for sale, of a substantial number of shares of
common stock in the public market subsequent to this offering pursuant to Rule
144 under the Securities Act ('Rule 144') or otherwise could materially
adversely affect the market price of the common stock and could impair Radyne
ComStream's ability to raise additional capital through the sale of its equity
securities or debt financing. Upon completion of this offering, if all rights
are fully exercised, there would be approximately 10,704,954 shares of common
stock issued and outstanding. Of these shares, Radyne ComStream believes that
approximately 1,028,154 would be freely transferable. The remaining 9,676,800
shares would be held by ST and would be eligible for resale subject to the
volume and manner of sale limitations of Rule 144 under the Securities Act.

DISCLOSURES RELATING TO LOW PRICED STOCKS MAY NEGATIVELY AFFECT LIQUIDITY

     Radyne ComStream's securities are subject to Rule 15g-9 under the Exchange
Act which imposes additional sales practice requirements for broker-dealers
which sell penny stocks to persons other than established customers and
accredited investors as defined in Regulation D under the Securities Act. For
transactions covered by this rule, a broker-dealer must make a special
suitability determination for the purchaser and have received the purchaser's
written consent to the transaction prior to sale.

     The SEC regulations define a 'penny stock' to be any equity security not
registered on a national securities exchange or for which quotation information
is disseminated on Nasdaq that has a market price (as therein defined) of less
than $5.00 per share or an exercise price of less than $5.00 per share, subject
to certain exceptions. Unless exempt, the rules require delivery, prior to a
transaction in a penny stock, of a disclosure schedule prescribed by the SEC
relating to the penny stock market. There are disclosure requirements relating
to commissions payable to both the broker-dealer and the registered
representative and current quotations for the securities. Finally, there is a
requirement for monthly statements disclosing recent price information for the
penny stock held in the account and information on the limited market in penny
stocks. Consequently, such rule may adversely affect the ability of
broker-dealers to sell Radyne ComStream's securities

                                       10





<PAGE>

and may adversely affect the ability of purchasers in this offering to sell any
of the securities acquired hereby in the secondary market.

THE MARKET PRICE OF OUR SHARES HAS BEEN VOLATILE

     Radyne ComStream cannot predict the effect that this offering will have on
the trading price of the common stock. There can be no assurance that the market
price of the common stock will not remain below the subscription price or that,
following the exercise of rights, a rights holder will be able to sell shares
acquired in this offering at a price equal to or greater than the subscription
price. Since Radyne ComStream emerged from bankruptcy, the price of the common
stock, which trades in the over-the-counter market under the OTC Bulletin Board
symbol 'RADN', has varied widely and the price of the common stock or the
shareholder rights may be subject to significant fluctuation in the future.
There has been no prior market for the rights.

PARTIES ON WHICH WE RELY MAY HAVE YEAR 2000 TECHNOLOGY PROBLEMS THAT DISRUPT OUR
BUSINESS

     The Year 2000 issue concerns the fact that certain computer systems and
processors may recognize the designation '00' as the year 1900 when it is
intended to mean the Year 2000, resulting in system failure or miscalculations.
Other potential date related errors may result from computer systems' inability
to recognize the year 2000 as a 'leap year', and such dates as 9 September 1999
(9-9-99), 1 January 2001 (1-1-01) may cause errors. All of these 'date related
issues' are commonly referred to as the 'Year 2000' issue or 'Y2K problem'.
Commencing in 1997, we began a comprehensive review of our information
technology systems, upon which our day to day business operations depend, in
order to determine the adequacy of those systems in light of future business
requirements. Year 2000 readiness was one of the factors considered in the
review process. We have completed that review and we believe that all mission
critical systems at our Phoenix facility are Year 2000 compliant, whereas
certain systems used at our San Diego facility require upgrading. We purchased
and expensed the upgrades in 1998 and expect their installation to be completed
in the third quarter of this year.

     Our Year 2000 readiness plan also involves the review of our
non-information technology systems, a review which we consider to be complete.
The only noncompliance which we discovered relates to certain date functions in
diagnostic equipment, which functions we do not employ. However, it is possible
that the scope of the Year 2000 problem could be greater than originally
believed and that our efforts could prove inadequate.

     As part of our comprehensive review, we are continuing to verify the Year
2000 readiness of third parties (vendors and customers) with whom Radyne
ComStream has material relationships. This is a particular concern in light of
our reliance on overseas assembly operations. A Year 2000 readiness survey was
sent to all of our material vendors and customers. We have received acceptable
responses from all of our mission critical vendors. We expect to receive
responses from 70% to 80% of our non-critical vendors. Efforts continue to
obtain as many responses as possible. In any event, we may increase some
inventory levels to mitigate any risk of inventory supply problems. We have also
created a database to track responses, problems and follow-up plans. While our
assessments of the readiness of our vendors are necessarily dependent upon their
survey responses, we intend to test their stated compliance where we determine
that to be a necessary and feasible step.

     In evaluating the potential impact of vendor Y2K noncompliance, we believe
that the two worst case scenarios would likely be as follows. First, if the
electric utility at either of our principal facilities were to black out,
operations at that facility could essentially cease for the duration of the
problem. At this point those utilities have provided reasonable assurances of
their own Y2K compliance, although they are not in a position to rule out
potentially relevant problems elsewhere on the power grid. Second, if one of our
major circuit board suppliers were to report Y2K compliance, but then surprise
us with a shut-down, our delivery schedule would be adversely affected. However,
since our contingency plan includes maintenance of a three-month inventory of
critical parts, we would expect to be able to replace the noncompliant vendor in
a timely enough

                                       11





<PAGE>

manner to avoid a product delivery delay of more than 30 days. However, we are
not able to precisely determine the effect on results of operations, liquidity
and financial condition in the event our material vendors and customers are not
Year 2000 compliant. Our inability to accurately forecast such effects may
prevent Radyne ComStream from taking necessary steps to rectify any Year 2000
problems in advance. Moreover it is impossible to predict the extent, if any, to
which customers may allocate funds to the solution of their own Year 2000
problems instead of purchasing our products. We will continue to monitor the
progress of our material vendors and customers and formulate a contingency plan
if and when we conclude that a material vendor or customer may not be compliant.

     We have completed a review of our products and determined that all but one
older ComStream product are Year 2000 ready. We are notifying purchasers and
potential purchasers of this product, relatively few of which have been sold.

     While we believe our efforts to date are adequate to prevent any Year 2000
problem from having a material adverse effect on Radyne ComStream, our
assessment may turn out to be inaccurate.

<TABLE>
<S>                                                       <C>
Year 2000 Readiness Costs
  Project Statistics:
     Cost to date (labor)...............................             $ 80,000
     Estimated cost to completion.......................  $75,000 to $125,000
</TABLE>

<TABLE>
<CAPTION>
                                                                      UNIT       SYSTEM
                           INVENTORY   ASSESSMENT   REMEDIATION     TESTING      TESTING
                           ---------   ----------   -----------     -------      -------
<S>                        <C>         <C>          <C>           <C>            <C>
Percentage...............      100%        100%           90%           50%          50%
Completed Completion
  Date...................   4/30/99     6/30/99       7/31/99       8/31/99      9/30/99
</TABLE>

               PURPOSE OF THE RIGHTS OFFERING AND USE OF PROCEEDS

ESTABLISHMENT OF SUBSCRIPTION PRICE

     The Board of Directors independently established the subscription price at
$3.73 per share, which the Board determined to be the fair market value of the
common stock at the time of its determination to conduct the rights offering.
The Board made this determination based on the conversion price fixed in the
convertible note issued to Spar in connection with the ComStream acquisition.
Through arms length negotiations, the parties set this price at fifty cents
below the average trading price of the common stock for the five trading days
following the announcement of the ComStream acquisition and this offering.

USE OF PROCEEDS

     The maximum net proceeds we will receive from the sale of the rights, net
of estimated expenses payable by Radyne ComStream, are estimated to be
approximately $17,400,000. We intend to use substantially all of the net
proceeds of this offering to repay indebtedness to ST.

     The indebtedness to ST which we intend to repay with the proceeds of this
offering equals $15,618,272 in principal amount, with interest and maturities as
follows:

<TABLE>
<CAPTION>
           DATE OF NOTE               PRINCIPAL    INTEREST RATE      MATURITY
           ------------               ---------    -------------      --------
<S>                                  <C>           <C>             <C>
January 5, 1998....................  $   500,000     6.84375%      March 31, 2000
January 15, 1998...................  $ 4,618,272     6.84375%      March 31, 2000
April 14, 1998.....................  $   250,000     6.625%        March 31, 2000
August 13, 1998....................  $   250,000     6.75%         March 31, 2000
August 28, 1998....................  $10,000,000     6.375%        March 31, 2000
</TABLE>

     Of this indebtedness, we borrowed $10,000,000 for the ComStream acquisition
and the balance for short-term working capital purposes or to repay other
indebtedness incurred for such purposes.

                                       12




<PAGE>

                                    DILUTION

     The net tangible book value (deficit) of Radyne ComStream at December 31,
1998, was approximately $(19,910,000), or $(3.36) per share of common stock. Net
tangible book value per share of common stock represents the tangible assets
(total assets less intangible assets) less total liabilities, divided by the
number of shares of common stock outstanding. After giving effect to the sale of
the rights and the common stock issuable pursuant to the rights, and the
application of the net proceeds from such transactions, the net tangible book
value (deficit) of the common stock at December 31, 1998 on a pro forma basis
would have been approximately $(2,510,000) or $(0.24) per share. This represents
an immediate increase in net tangible book value of $3.12 per share to existing
shareholders and an immediate dilution to purchasers of common stock through the
exercise of rights of $3.97 (106%) per share.

<TABLE>
<CAPTION>
                                                                 PER SHARE
                                                              ---------------
<S>                                                           <C>      <C>
Rights offering price.......................................           $ 3.73
     Net tangible book value (deficit) at December 31,
      1998..................................................  $(3.36)
     Increase attributable to sale of common stock pursuant
      to rights.............................................    3.12
Pro forma net tangible book value after this offering(1)....            (0.24)
                                                                       ------
Dilution to new investors...................................           $ 3.97
                                                                       ------
                                                                       ------
</TABLE>

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

(1) After deducting offering expenses of approximately $300,000 payable by
    Radyne ComStream.

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

     The foregoing computations exclude (i) 825,476 shares of common stock
issuable upon exercise of outstanding stock options at an exercise price of
$2.50 per share, 50,000 shares under options with an exercise price of $3.25 per
share, another 335,000 shares under options with an exercise price of $3.125 per
share and another 589,500 shares under options with an exercise price of $3.75
per share, as well as (ii) 1,240,485 shares reserved for future grants under
Radyne ComStream's 1996 Incentive Stock Option Plan and 1999 Employee Stock
Purchase Plan.

                              THE RIGHTS OFFERING

SUBSCRIPTION RIGHTS

     Shareholders will receive four rights for every five shares of common stock
held on the record date, an aggregate of approximately 4,745,076 rights. Holders
may purchase at the subscription price one share of common stock for each right
held. The rights will expire on the expiration date. The rights will be
transferable. Radyne ComStream will not issue any fractional rights.

EXPIRATION DATE

     The rights will expire at 5:00 p.m., New York time, on November 15, 1999,
except that Radyne ComStream reserves the right to extend the exercise period on
one or more occasions if the Board of Directors determines that the occurrence
of a material event necessitates an amendment of the Registration Statement or
recirculation of this Prospectus in order to permit time for the distribution of
such information. After the expiration date, unexercised rights will be null and
void. Radyne ComStream will have no obligation to honor any purported exercise
of such rights received by the subscription agent or Radyne ComStream after the
expiration date, regardless of the mailing date of the documents relating to
such exercise, except pursuant to the guaranteed delivery procedures described
below.

     If Radyne ComStream elects to extend the expiration date, it will issue a
press release to such effect not later than the first business day following the
most recently announced expiration date. In the event that Radyne ComStream
elects to extend the expiration date by more than 14 calendar days, we will, in
addition, provide prompt written notice of such extension to all rights holders
of record.

                                       13





<PAGE>

EXERCISE OF RIGHTS

     You may exercise rights by delivering to the subscription agent or Radyne
ComStream at or prior to 5:00 p.m., New York time, on the expiration date:

      the properly completed and executed subscription certificate evidencing
      such rights with any required signatures guaranteed, and

      payment in full of the subscription price for each right exercised.

     Such payment in full must be by check drawn upon a U.S. bank or postal,
telegraphic or express money order payable to Continental Stock Transfer & Trust
Company, as subscription agent; provided, however, that checks or money orders
that you send directly to Radyne ComStream should be payable to Radyne ComStream
Inc. Payment of the subscription price will be complete only upon

      clearance of any uncertified check, or

      receipt by the subscription agent or Radyne ComStream, as the case may be,
      of any certified check drawn upon a United States bank or of any postal,
      telegraphic or express money order.

     If paying by uncertified personal check, please note that such funds may
take at least five business days to clear. Accordingly, holders of rights who
wish to pay the subscription price by means of uncertified personal check should
make payment sufficiently in advance of the expiration date to ensure that such
payment arrives and clears by such date and should consider payment by means of
certified or cashier's check or money order.

     The address for delivery of subscription certificates and payment of the
subscription price with respect to rights to the subscription agent is set forth
below under 'Subscription agent.'

     If a holder of rights wishes to exercise rights, but cannot deliver the
subscription certificate(s) to the subscription agent or Radyne ComStream prior
to the expiration date, such holder may nevertheless exercise the rights if all
of the following conditions (the 'Guaranteed Delivery Procedures') are met:

      the subscription agent receives payment in full of the subscription price
      for each rights share being subscribed for (in the manner set forth above)
      on or prior to the expiration date;

      the subscription agent receives, on or prior to the expiration date, a
      Notice of Guaranteed Delivery from a member firm of a registered national
      securities exchange or a member of the National Association of Securities
      Dealers, Inc., or from a commercial bank or trust company having an office
      or correspondent in the United States (each, an 'Eligible Institution'),
      substantially in the form available upon request from the subscription
      agent whose address and telephone numbers appear under 'Subscription
      agent' below. The Notice of Guaranteed Delivery must provide:

           the name of the exercising holder of rights,

           the number of rights represented by the subscription certificate(s)
           held by such exercising holder of rights,

           the number of shares of common stock for which the holder subscribes,
           and

           a guarantee of the delivery to the subscription agent of any
           subscription certificate(s) evidencing such rights within three
           business days following the date of the Notice of Guaranteed
           Delivery; and

      the subscription agent receives the properly completed subscription
      certificate(s), with any required signatures guaranteed, within three
      business days following the date of the Notice of Guaranteed Delivery
      relating thereto. Holders may deliver the Notice of Guaranteed Delivery to
      the subscription agent in the same manner as subscription certificates at
      the address set forth under 'Subscription agent' below, or transmit it to
      the subscription agent by facsimile transmission (telecopy no.
      (212) 616-7610).

                                       14





<PAGE>

     A holder of rights who holds shares of common stock for the account of
others, such as a broker, a trustee or a depository for securities, should
notify the respective beneficial owners of such shares as soon as possible to
ascertain such beneficial owners' intentions and to obtain instructions with
respect to the rights. If the beneficial owner so instructs, the record holder
of such rights should complete the subscription certificate and submit it to the
subscription agent with the proper payment. In addition, the beneficial owner of
common stock or rights held through such a holder of record should contact the
rights holder and request the rights holder to effect transactions in accordance
with the beneficial owner's instructions.

     Signatures on the subscription certificate must be guaranteed by an
Eligible Institution, unless the subscription certificate:

      provides for delivery of the shares of common stock issuable upon exercise
      of the rights represented thereby to the holder, or

      is submitted for the account of an Eligible Institution.

     If the subscription certificate does not specify the number of shares of
common stock being subscribed for, or the funds delivered are not enough to pay
the subscription price for the number of shares specified, we will assume that
the number of shares of common stock subscribed for is the maximum number that
could be purchased with such funds.

     Holders should read these instructions carefully and follow them in detail.

     The method of delivery of subscription certificates and payment of the
subscription price to the subscription agent or Radyne ComStream will be at the
election and risk of the rights holder. We recommend that those who elect to
mail such certificates and payments use registered mail, properly insured, with
return receipt requested, with a sufficient number of days allowed to ensure
delivery to the subscription agent or Radyne ComStream and clearance of payment
prior to 5:00 p.m., New York time, on the expiration date. Because uncertified
personal checks may take at least five business days to clear, rights holders
should pay, or arrange for payment, by means of certified or cashier's check or
money order.

     We will determine all questions concerning the timeliness, validity, form
and eligibility of any exercise of rights, and our determinations will be final
and binding. Radyne ComStream, in its reasonable discretion, may waive any
defect or irregularity, or permit the correction of a defect or irregularity
within such time as it may determine, or reject the purported exercise of any
right. Subscriptions will not be acceptable until all irregularities have been
waived or cured within such time as Radyne ComStream determines. Neither Radyne
ComStream nor the subscription agent will be under any duty to give notification
of any defect or irregularity in connection with the submission of subscription
certificates or incur any liability for failure to give such notification.

     Please direct any questions or requests for assistance concerning the
method of exercising rights or requests for additional copies of this prospectus
or the Notice of Guaranteed Delivery to Radyne ComStream at 3138 East Elwood
Street, Phoenix, Arizona 85034, Attention: Director of Administration,
telephone: (602) 437-9620.

NO REVOCATION

     A holder of rights who has exercised those rights may not revoke such
exercise.

FRACTIONAL SHARES

     Radyne ComStream will not distribute fractional rights, and a holder may
not exercise a right in part.

METHOD OF TRANSFERRING RIGHTS

     You may transfer all rights evidenced by a single subscription certificate
by endorsing the subscription certificate for transfer in accordance with the
accompanying instructions. You may transfer a portion of the rights evidenced by
a single subscription certificate (but only in units to

                                       15





<PAGE>

purchase whole shares) by delivering to the subscription agent a subscription
certificate properly endorsed for transfer, with instructions to register such
portion of the rights in the name of the transferee (and to issue a new
subscription certificate to the transferee evidencing such transferred rights).
In such event, we will issue a new subscription certificate evidencing the
balance of the rights to the holder of the rights or, if the holder of the
rights so instructs, to an additional transferee.

     Holders of rights wishing to transfer all or a portion of their rights (but
only in units to purchase whole shares) should allow a sufficient amount of time
prior to the expiration date for:

      receipt of the transfer instructions and processing by the subscription
      agent,

      issuance of a new subscription certificate and transmittal to the
      transferee or transferees with respect to transferred rights, and to the
      transferor with respect to retained rights, if any, and

      exercise or sale of the rights evidenced by such new subscription
      certificates by the recipients of such rights.

     If time does not permit a transferee of a right who wishes to exercise its
right to deliver its subscription certificate to the subscription agent on or
before the expiration date, such transferee should make use of the Guaranteed
Delivery Procedure described under 'Exercise of rights' above. Neither Radyne
ComStream nor the subscription agent shall have any liability to a transferee or
transferor of rights who does not receive subscription certificates or new
subscription certificates in time for exercise or sale prior to the expiration
date.

     Radyne ComStream does not anticipate that anyone will make a market in the
rights or that they will trade on any exchange. There is no assurance that any
market will develop for the rights. In any event, trading in the rights will
cease at the close of business on the business day preceding the expiration
date.

FEES AND EXPENSES

     Except for the fees charged by the subscription agent (which Radyne
ComStream will pay as described below), all commissions, fees and other expenses
(including brokerage commissions and transfer taxes) incurred in connection with
the purchase or sale of rights will be for the account of the transferor of the
rights, and neither Radyne ComStream nor the subscription agent will pay any of
such commissions, fees or expenses.

     All fees and other expenses incurred in connection with the exercise of
rights will be for the account of the holder of such rights, neither Radyne
ComStream nor the subscription agent will pay any of such fees or expenses.

SUBSCRIPTION AGENT

     Radyne ComStream has appointed Continental Stock Transfer & Trust Company
as subscription agent for this offering. The subscription agent's address, which
is its address for delivery of subscription certificates and payment of the
subscription price, as well as the address for delivery of any Notice of
Guaranteed Delivery, is:

           Continental Stock Transfer & Trust Company
           2 Broadway
           New York, New York 10004
           (212) 509-4000

     The subscription agent will hold subscription price payments pending the
application or return of such payments in accordance with the terms of this
offering.

     Radyne ComStream will pay the subscription agent reasonable and customary
compensation for its services in connection with this offering and will
reimburse it for its reasonable out-of-pocket expenses.

                                       16





<PAGE>

     The Board of Directors of Radyne ComStream makes no recommendation to
holders of rights with respect to whether a holder of rights should exercise
rights to purchase shares of common stock or to investors with respect to
whether an investor should purchase shares of common stock, or to persons with
respect to whether a person should purchase rights.

                        FEDERAL INCOME TAX CONSEQUENCES

     In the opinion of Dorsey & Whitney LLP, counsel to Radyne ComStream, the
following are the material federal income tax consequences of the rights
offering to the holders of the rights (other than certain holders of the rights
described in the following paragraph) upon the issuance, exercise, transfer and
lapse of the rights.

     The following is based on the Internal Revenue Code of 1986, as amended,
the Treasury Regulations promulgated thereunder, judicial authority and current
administrative rulings and practice, all of which are subject to change on a
prospective or retroactive basis, and on the accuracy of certain representations
of Radyne ComStream. The following does not address tax consequences of this
offering under state, local and foreign law. Moreover, special considerations
not described herein may apply to certain taxpayers, such as financial
institutions, broker-dealers, life insurance companies, regulated investment
companies, foreign entities, individuals who are not citizens or residents of
the United States for federal income tax purposes, tax-exempt organizations or
accounts and corporations affiliated with Radyne ComStream. The following is
limited to those who have held the common stock, and will hold the rights and
any common stock acquired upon the exercise of rights as capital assets
(generally, property held for investment) within the meaning of Section 1221 of
the Internal Revenue Code. Capital assets held for longer than one year may give
rise to long-term capital gain or loss.

     ISSUANCE OF THE RIGHTS. Holders of common stock will not recognize taxable
income for federal income tax purposes in connection with the receipt of the
rights.

     BASIS AND HOLDING PERIOD OF THE RIGHTS. Except as described below, the
basis of the rights received by a shareholder as a distribution with respect to
such shareholder's common stock will be zero. If either:

      the fair market value of the rights on the date of distribution is equal
      to 15% or more of the fair market value on such date of the common stock
      with respect to which the rights are received, or

      the shareholder properly elects, in the shareholder's federal income tax
      return for the taxable year in which the shareholder receives the rights,
      to allocate part of the basis of such common stock to the rights,

then upon exercise or transfer of the rights, the shareholder will allocate the
basis in such common stock between the common stock and the rights exercised or
transferred in proportion to the fair market values of each on the date of
distribution. For example, a holder of 100 shares of common stock would receive
rights to purchase 80 shares. If the shares were trading at $5.00 on the
distribution date and the rights were trading at $1.00, the rights would have a
fair market value of $80, which would be 16% of the shares' $500 fair market
value. In this case, the holder would allocate the basis in the shares between
the rights and the shares in proportion to such fair market value, i.e. 80/580
to the rights and 500/580 to the shares.

     The holding period of a shareholder with respect to rights received as a
distribution on such shareholder's common stock will include the shareholder's
holding period for that common stock in addition to the actual holding period of
the rights.

     In the case of a purchaser of rights, the tax basis of such rights will be
equal to the purchase price paid therefor, and the holding period for such
rights will commence on the day following the date of the purchase.

     TRANSFER OF THE RIGHTS. A shareholder who sells the rights prior to
exercise will recognize gain equal to any excess of the amount realized from the
sale over such shareholder's basis (if any) in the rights sold. Conversely, if
the shareholder's basis in the rights sold exceeds the amount realized

                                       17





<PAGE>

on the sale, the shareholder will recognize a loss equal to that excess. Such
gain or loss will be capital gain or loss if gain or loss from a sale of the
underlying shares would be characterized as capital gain or loss at the time of
such sale. Any gain or loss recognized on a sale of rights acquired by purchase
will be capital gain or loss if the underlying shares would be a capital asset
in the hands of the seller.

     LAPSE OF THE RIGHTS. Shareholders who allow the rights received by them to
lapse will not recognize any gain or loss, and no adjustment will be made to the
basis of the common stock, if any, owned by such shareholders.

     Purchasers of the rights will be entitled to a loss equal to their tax
basis in the rights, if such rights expire unexercised. Any loss recognized on
the expiration of the rights acquired by purchase will be a capital loss if the
underlying rights shares would be a capital asset in the hands of the purchaser.

     EXERCISE OF THE RIGHTS; BASIS AND HOLDING PERIOD OF COMMON STOCK. Holders
of rights will not recognize any gain or loss upon the exercise of rights. The
basis of the common stock acquired through exercise of the rights will be equal
to the sum of the subscription price paid therefor and the holder's basis in
such rights (if any).

     The holding period for the common stock acquired through exercise of the
rights will begin on the date the rights are exercised.

     INFORMATION REPORTING AND WITHHOLDING. Under the backup withholding rules
of the Internal Revenue Code, a holder of the rights may be subject to backup
withholding at the rate of 31 percent with respect to payments made pursuant to
this offering, unless such rights holder

      is a corporation or comes within certain other exempt categories and, when
      required, demonstrates this fact, or

      provides a correct taxpayer identification number and certifies under
      penalties of perjury that the taxpayer identification number is correct
      and that the holder of rights is not subject to backup withholding because
      of a failure to report all dividends and interest income.

     Any amount withheld under these rules will be a credit against such
person's federal income tax liability. Radyne ComStream may require holders of
the rights to establish exemption from backup withholding or to make
arrangements satisfactory to Radyne ComStream with respect to the payment of
backup withholding.

     The foregoing is for general information only. Accordingly, each holder is
urged to consult with his or her own tax advisor with respect to the tax
consequences of the rights offering applicable to his or her own particular tax
situation, including the application and effect of federal, state and local
income and other tax laws.

                                       18





<PAGE>

                          PRICE RANGE OF COMMON STOCK

     Radyne ComStream's common stock trades in the over-the-counter market under
the OTC Bulletin Board symbol 'RADN.' However, there is no established trading
market as actual transactions are infrequent. The following table sets forth the
range of high and low trading prices as reported by the National Quotation
Bureau, Inc. for the periods indicated. At April 16, 1999, Radyne ComStream had
approximately 443 shareholders of record. Radyne ComStream believes that the
number of beneficial owners is actually in excess of 1,600, due to the fact that
a large number of shares are held in street name.

<TABLE>
<CAPTION>
                                                             HIGH       LOW
                                                             ----       ---
<S>                                                          <C>        <C>
1997:
     First quarter.........................................    6         3 1/8
     Second quarter........................................    3 1/4     3
     Third quarter.........................................   10 3/4     5
     Fourth quarter........................................   10 1/2     4
1998:
     First quarter.........................................    5 1/4     2 7/64
     Second quarter........................................    5         3
     Fourth quarter........................................    5         2 1/2
1999:
     First quarter.........................................    4 1/4     2 1/4
     Second quarter........................................    3 3/4     2 1/2
</TABLE>

On September 24, 1999 the last sale price of the common stock as reported by the
OTC Bulletin Board was $2 3/4 per share.

                          DESCRIPTION OF CAPITAL STOCK

COMMON STOCK

     The following summary description of the common stock is qualified in its
entirety by reference to Radyne ComStream's Certificate of Incorporation.

     Radyne ComStream is authorized to issue up to 20,000,000 shares of common
stock, par value $.002 per share, of which 5,959,878 shares are outstanding as
of the date hereof. Holders of common stock are entitled to one vote for each
share held of record on each matter submitted to a vote of stockholders. There
is no cumulative voting for election of directors. Holders of common stock are
entitled to receive dividends ratably when, as and if declared by the Board of
Directors out of funds legally available therefor and, upon the liquidation,
dissolution or winding up of Radyne ComStream, are entitled to share ratably in
all assets remaining after payment of liabilities. Holders of common stock have
no preemptive rights and have no rights to convert their common stock into any
other securities. The outstanding common stock is validly authorized and issued,
fully paid and nonassessable.

TRANSFER AGENT

     Radyne ComStream has appointed Continental Stock Transfer & Trust Company
as transfer agent for the common stock.

                        SHARES ELIGIBLE FOR FUTURE SALE

     The sale, or availability for sale, of a substantial number of shares of
common stock in the public market subsequent to this offering pursuant to Rule
144 under the Securities Act ('Rule 144') or otherwise could materially
adversely affect the market price of the common stock and could impair Radyne
ComStream's ability to raise additional capital through the sale of its equity
securities or debt financing. Upon completion of the rights offering, if all
rights are fully exercised, there would be approximately 10,704,954 shares of
common stock issued and outstanding. Of these shares, Radyne ComStream believes
that approximately 1,028,154 would be freely transferable

                                       19





<PAGE>

immediately. ST would hold the remaining approximately 9,676,800 shares, which
would be eligible for resale, subject to the volume and manner of sale
limitations of Rule 144 under the Securities Act.

     The holders of options outstanding under our 1996 Incentive Stock Option
Plan may purchase up to an aggregate of 1,799,976 shares of common stock. All of
the shares issuable upon exercise of such options are covered by a currently
effective registration statement on Form S-8. Of these options, 1,020,851 are
presently exercisable and the remaining 779,125 will become exercisable over the
next three years. In addition, up to 968,900 shares would be issuable in the
event of conversion of the note held by Spar, and Spar would be entitled to
certain registration rights which would require Radyne ComStream to file a
registration statement for such shares. If Radyne ComStream were to register all
of the shares underlying the Spar note and all of the optionees under our 1996
Incentive Stock Option Plan were to fully exercise their options, an additional
2,768,876 shares would be freely tradeable.

     Prior to this offering, there has been no established public market for
Radyne ComStream's securities as trading in the common stock has been
infrequent. Following this offering, Radyne ComStream cannot predict the effect,
if any, that sales of shares of common stock pursuant to Rule 144 or otherwise,
or the availability of such shares for sale, will have on the market price from
time to time. Nevertheless, sales by the current stockholders of a substantial
number of shares of common stock in the public market could materially adversely
affect market prices for the common stock. In addition, the availability for
sale of a substantial number of shares of common stock acquired through the
exercise of rights or outstanding options under the Plan could materially
adversely affect market prices for the common stock.

                                 LEGAL MATTERS

     Dorsey & Whitney LLP, New York, New York will pass upon certain legal
matters for Radyne ComStream.

                                    EXPERTS

     The restated consolidated financial statements for Radyne ComStream Inc. at
December 31, 1998 and for the year then ended have been incorporated by
reference herein and in the registration statement in reliance upon the report
of KPMG LLP, independent certified public accountants, which is incorporated
herein by reference, and upon the authority of said firm as experts in
accounting and auditing. The financial statements of Radyne ComStream Inc. at
December 31, 1997, for the year then ended, for the six months ended
December 31, 1996 and for the year ended June 30, 1996, incorporated by
reference in this Prospectus from our Report on Form 10-K/A for the year ended
December 31, 1998, have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their report which is incorporated herein by reference,
and have been so incorporated in reliance upon the report of such firm given
upon their authority as experts in accounting and auditing. Ernst & Young LLP,
independent auditors, have audited the consolidated financial statements of
ComStream Holdings, Inc. at December 31, 1997 and 1996, and for each of the
three years in the period ended December 31, 1997, included in our Report on
Form 8-K/A filed with the Securities and Exchange Commission on May 5, 1999, as
set forth in their report, which is included and incorporated by reference in
this prospectus. The consolidated financial statements of ComStream Holdings,
Inc. are included and incorporated by reference in reliance on the report of
Ernst & Young LLP, given on their authority as experts in accounting and
auditing.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

     Certain statements in the Prospectus Summary and under the captions 'Risk
Factors,' 'Purpose of the Rights Offering and Use of Proceeds,' and elsewhere in
this Prospectus constitute 'forward-looking statements' within the meaning of
Section 27A of the Securities Act and Section 21E of the Exchange Act. Such
forward-looking statements involve known and unknown risks,

                                       20





<PAGE>

uncertainties and other factors, which may cause the actual results, performance
or achievements of Radyne ComStream, or industry results, to be materially
different from any future results, performance or achievements expressed or
implied by such forward-looking statements. Such factors include, among others,
the following general economic and business conditions: the loss of, or the
failure to replace, any significant customers; changes in business strategy or
development plans; the timing and success of new product introductions; the
quality of management; the availability, terms and deployment of capital; the
business abilities and judgments of personnel; the availability of qualified
personnel; and other factors referenced in this Prospectus. These forward-
looking statements speak only as of the date of this Prospectus. Radyne
ComStream expressly disclaims any obligation or undertaking to release publicly
any updates or revisions to any forward-looking statement contained herein to
reflect any change in Radyne ComStream's expectations with regard thereto or any
change in events, conditions or circumstances on which any such statement is
based.

                                       21




<PAGE>

_____________________________                      ____________________________
_____________________________                      ____________________________

     NO DEALER, SALESMAN, OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS IN
CONNECTION WITH THIS OFFERING. IF GIVEN OR MADE, YOU SHOULD NOT RELY UPON SUCH
INFORMATION OR REPRESENTATION AS HAVING BEEN AUTHORIZED BY RADYNE COMSTREAM INC.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN
OFFER TO BUY, ANY OF THE SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY
PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH AN OFFER OR SOLICITATION IN SUCH
JURISDICTION. YOU SHOULD NOT ASSUME BASED ON THE DELIVERY OF THIS PROSPECTUS OR
THE EXECUTION OF SALES UNDER THIS PROSPECTUS THAT THE INFORMATION IN THIS
DOCUMENT REMAINS CURRENT.

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Where You Can Find More
  Information...............................................    1
Summary.....................................................    3
Risk Factors................................................    7
Purpose of the Rights Offering and Use of Proceeds..........   12
Dilution....................................................   13
The Rights Offering.........................................   13
Federal Income Tax Consequences.............................   17
Price Range of Common Stock.................................   19
Description of Capital Stock................................   19
Shares Eligible for Future Sale.............................   19
Legal Matters...............................................   20
Experts.....................................................   20
Special Note Regarding Forward-looking Statements...........   20
Annual Report on Form 10-K/A
Quarterly Report on Form 10-Q/A
</TABLE>

_____________________________                      ____________________________
_____________________________                      ____________________________


                                4,745,076 SHARES

                                     RADYNE
                                 COMSTREAM INC.

                                  COMMON STOCK

                             ----------------------
                                   PROSPECTUS
                             ----------------------

                               SEPTEMBER 30, 1999

_____________________________                      ____________________________





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