Ham Radio monitoring of the Black Knight satellite surfaced on the abovetopsecret web site.
Black Knight is the name given to a radar blip discovered in 1960. This mystery satellite was found in a polar orbit, something neither the US nor the Soviets had accomplished. It was several times larger and several times heavier than anything capable of being launched with 1960 rockets. It shouldn't have been there, but it was.
If that weren't enough, ham operators began receiving odd messages from the Black Knight. One operator decoded a series of these messages as a star map.
Historical records of the ham radio operator monitoring of the Black Knight satellite might be interesting.
Disclaimer: I neither believe or disbelieve the article; that the article surfaced again on a very large website causes the subject matter to be somewhat interesting.