The Buzzer: Are there secret spy messages on the radio?
Twenty Thousand Hertz
How to Find a Shortwave Radio Station
Lewis used the CIA Reading Room, which is an online database of declassified military and intelligence documents. The final step would be to go on to a mapping platform like Google Maps or another satellite imagery provider looking for possible transmitter sites. That meant staring at maps for weeks on end, because a radio transmitter on a satellite map doesn't look like very much.
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