A special commemorative FM broadcast Saturday, June 11, at noon EDT will mark the 70th anniversary of Maj Edwin H. Armstrong's first public demonstration of wideband frequency modulation (FM). The broadcast will emanate from Armstrong's 400-foot-tall experimental tower in Alpine, New Jersey, overlooking the Hudson River. For those lacking an FM radio that can tune to 42.8 MHz, the broadcast will be simulcast via WFDU(FM) 89.1 MHz, which also will provide a streaming webcast . The entire program will be rebroadcast on the Web at 7 PM EDT on June 14 and 16. A recording of the complete broadcast will be available for download at . Additional information about the commemorative broadcast and the Alpine tower site is available on the CSC Management Web site ARRL-Letter