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Steganography? Sure, but you might be better off using a code that sounds like normal speech.

There's a lot of weird stuff on radio. You don't need encryption to have codes. But this probably wouldn't be useful for sending surveillance information from a balloon. It would also draw a lot of attention.

https://en.wikipedia.org/wiki/Numbers_station

(Buzzer) https://en.wikipedia.org/wiki/UVB-76

https://en.wikipedia.org/wiki/Secret_broadcast

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