On this day in 1960, "Amos 'n' Andy" made its last broadcast on the CBS Radio Network.

On this day in 1960, the CBS Radio Network ended the last 4 remaining radio soap operas it had.

On this day in 1966, Pirate Radio station 390, Radio Invicta, closed down.

On this day in 1976, a Viking 1 radio signal from Mars help to prove Einstein's general theory of relativity.