The mysterious Persian-language transmission began about 12 hours after the start of the US-Israeli bombing campaign against Iran. It was jammed five days later. Is it a coded message for US agents in ...

Shortwave radio listeners around the world have reported hearing mystery broadcasts in Persian on a new 'numbers station' ...

Add Yahoo as a preferred source to see more of our stories on Google. Illustration: MH370 plane on blue background with radio signals being emitted around itt Transmissions from amateur radio ...

Reginald Fessenden, transmitting the first radio signal on Christmas Eve 1906, marked a revolutionary moment. Before that, voices and music were never transmitted, and signals were mostly Morse code.