Donald Menzel on Radar (and Astronomy): a UFO connection?
Radar was "blamed" for the alleged Aztec crash of 1948 and recent loony (?) talk at Kevin Randle's blog suggested that the Roswell incident was the result of an alien (extraterrestrial) craft being downed by radar.
At any rate, Menzel offers a few asides that could (possibly!) allow for radar-caused-flying disk crashes.