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Yagi Boom-To-Mast Slotted Crossover Plate
A 90 x 90 x 8 mm crossover plate that joins a Yagi or long-range Wi-Fi antenna boom to its mast at 90°. It uses M6 or 1/4 in U-bolts in 6.8 mm slots, which take leg spacings from 16 to 52 mm, so you can pair a boom and mast of different sizes anywhere from about 15 to 45 mm OD without drilling or shimming. Three 45° V-cradle blocks on top centre the boom, and a 45° V-groove on the underside centres the mast. The plate prints flat with no supports.
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