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Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole in a collinear design

a Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole.

The Super J Pole antenna is a co-linear vertical consisting of a number of half wave length vertical elements separated with half-wave length stubs (Tuning stub) feed with a folded matching stub by vk6ysf

Plans and drawings of common amateur radio antennas, like jpoles, copper cactus, super jpole, omnidirectionals and quads