Wright's Aerials

Aerial Photography - Modern

Someone, it appears, has taken two Antiference XG21A aerials and has combined them into one, err, XG30A aerial. It has roughly 30 bays of four elements, anyway. Possibly it was in fact made from an XG21A and an XG14A. In any case, it’s probably the longest XG in captivity. Why has Antiference never made (or at least sold) such a monstrous aerial, I hear you ask? Because Antiference knows that the law of diminishing returns applies pretty stringently to the director elements on a yagi. Once you go beyond about twenty directors (or bays) there’s very little to be gained by adding more. If this amount of aluminium had been used to construct an array of two stacked XG14As the gain and directivity would have been much better.

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