Underground Frequency Guide: A Directory of Unusual, Illegal, and Covert Radio Communications Paperback – Oct 1994
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Top Customer Reviews
Written during the peak of unusual radio communications, The Underground Frequency Guide covers "numbers stations" that intelligence agencies may use to communicate with agents, international diplomatic traffic, Air Force One's phone calls, and bootleg radio users... everyone from fishermen to guerilla military forces.
Oh, and did I mention that it's 100% legal to tune in in the United States?
The only problem with this book is that it has become just a bit outdated. Frequencies change on occasion, and some stations mentioned have been silenced, gone encryped, disappeared, or switched frequencies.
This book is a good background read, but don't expect all the infromation to remain accurate. For more recent information you can check websites like spynumbers.com.
Most Helpful Customer Reviews on Amazon.com (beta)
The author, Don Schimmel, is a well-regarded figure among radio amateurs and a quick web search of his name will bring you to his website (check out Radio Intrigue with Don Schimmel). There, you will find all of Don's latest finds in the world of the unusual, including numbers stations, clandestine military signals, strange beacons, and all manner of odd and unusual utility stations that one can find using a shortwave radio, patience and a little bit of luck.