Filed by Western Multiplex Corporation
Pursuant to Rule 425 under the Securities Act of 1933
and deemed filed pursuant to Rule 14a-12
of the Securities Exchange Act of 1934

Subject Company: Adaptive Broadband Corporation
Commission File No. 0-07428

November 13, 2000

The following information contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to risks and uncertainties which could cause actual results to differ materially from those projected, anticipated or implied. These statements are often indentified by words such as "expect", "anticipated" and "intend." The forward-looking statements address the following subjects, among others: expected date of closing the merger, future financial and operating results, and timing and benefits of the merger. Statements regarding the expected date of completion of the transaction are subject to the risk that the closing conditions will not be satisfied, including the risk that regulatory approvals will not be obtained or that the stockholders of Western Multiplex or Adaptive Broadband will not approve the merger and that the merger will not be consummated.

Statements regarding the expected benefits of the transaction and the company's expected revenues and EBITA margins are subject to the following risks: that expected synergies will not be achieved; that businesses will not be integrated successfully; that merger costs will be greater than expected; the inability to identify, develop and achieve success for new products, services and technologies; increased competition and its effect on the company's pricing and need for marketing; disruption from the merger making it more difficult to maintain relationships with customers, employees or suppliers; the inability to establish or renew relationships with advertising, marketing, technology, and product or component providers or suppliers; and to the general risks associated with the companies' businesses.

Careful consideration also should be given to cautionary statements made in Western Multiplex's reports filed with the Securities and Exchange Commission, especially the section entitled "Risk Factors" in Western Multiplex's Form S-1 filed on July 20, 2000 and in Adaptive Broadband's reports filed with the Securities and Exchange Commission, especially the section entitled "Risk Factors" in Adaptive Broadband's Annual Report on Form 10-K for the year ended June 30, 2000.

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THE FOLLOWING ARE ROAD SHOW MATERIALS DISSEMINATED BY WESTERN MULTIPLEX CORPORATION AND ADAPTIVE BROADBAND CORPORATION

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ADDITIONAL INFORMATION AND WHERE TO FIND IT

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS REGARDING THE MERGER WHEN IT BECOMES AVAILABLE BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION. The joint proxy statement/prospectus will be filed with the Securities and Exchange Commission by Western Multiplex and Adaptive Broadband. Investors and security holders may obtain a free copy of the joint proxy statement/prospectus (when it is available) and other documents filed by Western Multiplex and Adaptive Broadband at the Commission's web site at www.sec.gov. The joint proxy statement/prospectus and these other documents may also be obtained for free from the parties.

In addition to the joint proxy statement/prospectus, Western Multiplex and Adaptive Broadband file annual, quarterly and special reports, proxy statements and other information with the Securities and Exchange Commission. You may read and copy any reports, statements or other information filed by Western Multiplex and Adaptive Broadband at the Securities and Exchange public reference room at 450 Fifth Street, N.W., Washington, D.C. 20549 or at any of the Commission's other public reference rooms in New York, New York and Chicago, Illinois. Western Multiplex's and Adaptive Broadband's filings with the Commission are also available to the public from commercial document-retrieval services and at the website maintained by the Commission at http://www.sec.gov.

Western Multiplex, Adaptive Broadband and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the security holders of Western Multiplex and Adaptive Broadband in favor of the merger. The directors and executive officers of Western Multiplex and their beneficial ownership of Western Multiplex common stock are set forth in the registration statement filed by Western Multiplex on Form S-1 on July 20, 2000. The directors and executive officers of Adaptive Broadband and their beneficial ownership of Adaptive Broadband stock are set forth in the proxy statement for the 2000 annual meeting of Adaptive Broadband. In addition, in connection with signing the merger agreement, certain executive officers of Adaptive Broadband have entered into employment agreements with Western Multiplex, upon completion of the merger, certain directors of Adaptive Broadband will become directors of Western Multiplex, the executive officers of Adaptive Broadband own options to purchase shares of Adaptive Broadband common stock which will become vested and exercisable in connection with the merger and Western Multiplex has agreed to provide indemnification and director to officer liability insurance coverage to the directors and executive officers of Adaptive Broadband following the merger. Security holders of Western Multiplex and Adaptive Broadband may obtain additional information regarding the interests of the foregoing people by reading the joint proxy statement/prospectus when it becomes available.

CONTACT:

Nancy Huber
Western Multiplex Corporation
(408) 542-5225
[email protected]

Stephanie Day
Adaptive Broadband Corporation
Investor Information Line
(Toll-free 1-888-225-6789)
www.adaptivebroadband.com