Every A-Team had one...very rare today, especially working. Developed in the late 1940's/early 50's by the CIA as the electrically identical RS-1 spy-set, this is an improved version (c1964) US Army GRC-109A station... made to be buried, submerged and take a lick'n and keep on tick'n. Housed in gasketed heavy cast aluminum cases. Playing on 7 MHz in the lower amateur band with this today...