Shortwave radio bands are filled with mysterious stations that do nothing except read numbers. These are often coded messages to spies. From the era of the Cold War up to the present, listen in to them and learn how foreign governments communicate with spies, even here in the US. Hear many recorded excerpts, view pictures of clandestine radio sites, and pictures of captured spies.
Mike Langner is a lifelong radio enthusiast, having started in ham radio in junior high school, and ending up owning and operating two Albuquerque radio stations. Now in active retirement, he is the technical consultant to the New Mexico Broadcasters Association, travelling around our state assisting broadcasters with technical and operational issues and problems.