Anonym1ty writes "A special commemorative FM broadcast Saturday, June 11, at noon (EDT) will mark the 70th anniversary of Edwin H. Armstrong's first public demonstration of wideband frequency modulation (FM). The transmission, from Experimental Station WA2XMN (reminiscent of Armstrong's W2XMN call sign) will be on Armstrong's original 42.8 MHz frequency and will emanate from his landmark 400-foot Alpine Tower in NJ. The program will tell the tale of FM's difficult birth, as well as its impact on present-day communications and will include excerpts from a recording of a 1941 test broadcast of the New England Yankee Network. For those unable to receive 42.8 MHz FM, the broadcast is being retransmitted by WFDU-FM on 89.1 MHz and via the Web. Rebroadcasts will take place June 14 and 16 at 7 PM (EDT)"