Numbers stations are a mysterious phenomenon of shortwave radio dating back to the Cold War. The radio signals are secret messages sent by intelligence agencies to undercover spies all over the world, ...

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For much of the last century, shortwave radio was the only way to hear broadcasts from far away. Like many other listeners, producer David Goren fell in love with the sound of the shortwave bands.

SEOUL (Reuters) - As a scratchy rendition of Beethoven's Piano Sonata No 8 fades into a sea of shortwave radio static, a robotic female voice starts speaking in Korean. "Number 1913, number 1913, ...