A modern giant Yagi

A giant HF divided-boom Yagi antenna designed, constructed, and demonstrated by radio amateurs is described. The antenna, designed using the method-of-moments MININEC wire code, consists of 13 widely-spaced elements disposed on six towers, in a fixed-azimuth application. Overall antenna dimensions are 10 m by 100 m by 25 m above the ground: a structure roughly 0.5*5.0*1.0 wavelengths in the WARC-allocated 20-m amateur band. The elements are arranged for a considered balance among forward gain, sidelobe level, impedance level, bandwidth, and structural wind survival and construction economies, with an EM emphasis on forward gain. The antenna operates at a center frequency of 14.150 MHz ( lambda =21.15 m). The operating principle of the antenna is reviewed, and some of the errors to which it is prone are examined.<
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