Since before the time of Sun Tzu, communications has played an important role in the collection of intelligence. With the advent of effective portable radio technology in the 1930’s, it became feasible for an operative to send and receive information quickly and independently from within enemy territory.
The purpose of this research paper is to document facts, observations, anecdotes, and stories about clandestine radio equipment as used by the United States. The specific equipment presented here was chosen either because it had a major role in clandestine work, or because sufficient information was available to the author. Pictures and brief descriptions of additional equipment can be found in books by H. Keith Melton (see the Bibliography); and also at various sites on the World Wide Web.