[R-390] Wullenweber Antenna

[William G. Mills]

The "Elephant Cage" circular antenna mentioned in previous posts is in fact the Wullenweber direction finding antenna originally designed by the Germans during World War II.  The U.S. Armed Forces signal intelligence services improved on the Wullenweber antenna design and installed the antennas with associated HF receivers, computers,  at signal intelligence sites world wide i.e. Panama, Korea, Greece, Turkey, Germany, etc.  The R-390A along with Hammarlund SP-600 receivers were the principal receivers used at the "field stations".  Those receivers were later replaced by the Harris line of HF receivers. 

Most, if not all, of the signal intelligence sites have been deactivated.

Bill Mills
KC4AA
LTC, U.S. Army Signal Corps (Retired)