Hello group, I have enjoyed the various opinions & comments expressed on this question. This near / far field issue is very complex and outside the confines of this forum. A simple "rule of thumb" is useful only for a quick estimation. The point at which a wavefront becomes qusai-planer and coupled (far field) can be roughly estimated to be a point somewhere at 8-10*lambda if one is inclined to shoot from the hip. A definitive answer becomes very complex due to the huge number of variables involved. The best treatment I have found is in Stutzman & Thiele's book "Antenna Theory & Design" 2ed. (Wiley Press) Prof.'s Stutzman & Thiele treatment on this subject is both imaginative and thorough. Worth looking at. Just one guy's opinion - for what it's worth. Michael Taylor - PE,NCE Loveland, CO
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