2-element active antenna. Dave uses this system to phase-null noise. Greater than 30 dB noise nulls can be achieved, aiding in his LowFER reception in the 1750 meter-band. The more noise producing horizontal whip is phased against the "signaL" vertical whip, with the result in lower noise. Signals themselves may be phase-nulled, for instance, local NDB's can be phased-nulled to reveal DX.
Dave's R-390 Receiver
Another shot of Dave's operating position and fabulous ICOM receiver.
Dave's low-noise loop antenna system.
Dave's wonderful old Hallicrafters SX-28
WD2XFJ 183.5 kHz (ex-'PLI') LowFER Beacon Article