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canvas prints black and white canvas prints us air force canvas prints wacs canvas prints cold war canvas prints history canvas prints monochrome canvas prints communications canvas prints antenna canvas prints feeder canvas prints alaska canvas prints telecommunications canvas prints parabolic canvas prints historical canvas prints technology canvas prints usa canvas prints

photographs black and white photos us air force photos wacs photos cold war photos history photos monochrome photos communications photos antenna photos feeder photos alaska photos telecommunications photos parabolic photos historical photos technology photos usa photos

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Communications antenna. This tropospheric scatter antenna and feeder horn (right) are part of the US Air Force's White Alice Communications System (WACS) built in Alaska during the Cold War. Tropospheric antennas use microwave radio signals and are able to transmit beyond the horizon using a method called tropospheric scattering. The signal is pointed in the direction of the receiver, just above the horizon. As the signal passes through the troposphere, some of the waves are refracted back towards Earth and picked up by the receiver. WACS was made obsolete by satellite communications. Photographed at Boswell Bay, Alaska, USA.

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