Maybe they mean absolutely NOTHING. I mean, if the CIA (or whoever) was brodcasting *supposedly* secret messages on short wave radio, wouldn't the KGB (or whoever) have to devote resources and manpower to try to decode it? So, just broadcasting jibberish and gongs, etc. could have the desired effect.
Maybe at this point, one branch of the CIA is still broadcasting them, and a whole different branch is trying to decipher them, not realizing they came from the CIA in hte first place...
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