U.S. Naval Base, Pearl Harbor, Naval Radio Station, AF/FRD-10 Circularly Disposed Antenna Array, Wahiawa, Honolulu County, HI

Significance: The AN/FRD-10 Circularly Disposed Antenna Array (CDAA) at NCTAMS (Facility 314) was a part of the US' Cold War efforts to gather foreign intelligence information. Along with fourteen other FRD-10 CDAAs worldwide, it was part of the Naval Security Group's Classic collection and transmitter locating. This CDAA technology, designed by the Naval Research Laboratory and deployed as the FRD-10, was a radical improvement in the performance of high-frequency direction finding. Its design is the Navy's adaptation of an antenna system using monpole and dipole elements uniformly spaced outside the rings of reflector screens. This, the system is able to intercept and detect the direction of high-frequency radio transmissions covering 360 degrees.
Unprocessed Field note material exists for this structure: N1123
Survey number: HABS HI-522-B
Building/structure dates: 1962 Initial Construction