We report on the first experiment using two high power, high frequency tran
smitting facilities in a bistatic, interferometer mode. The HAARP and HIPAS
facilities in Alaska radiated at 4525 kHz with total combined power of abo
ut 700 kW, in the direction of the WIND spacecraft. The WAVES experiment ab
oard WIND received the transmissions at a distance of about 25 earth radii.
The experimental setup thus resembled Young's two-slit experiment. The exp
ected interference pattern was observed; at the distance of WIND, the fring
e size was about 30 km peak to peak.