Weird Radio: A Collection of Spy Transmissions, Unidentified Stations, and other Mysteries of the Airwaves

For more than a century, radio has been a part of people's lives. No one alive today remembers a time when it hadn't always been there as a familiar, reliable source of information and entertainment. Today, it seems a bit mundane, overtaken by the Internet and satellite television. Even in the 1980s, the development of cable television (50 channels instead of five) and the start of MTV made radio seem quaint, and as many once claimed, “Radio is dead.”

It wasn't, of course. Radio is still pop...