Slim Jim & J-Pole Antenna Calculator By M0UKD
The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentrated almost parallel to ground toward the horizon rather than skyward making it more efficient than a ground plane type antenna by about 50 percent better. It can be built for almost any frequency.
Slim Jim antenna as the variation of the J-pole, which is related to the J-pole as the way a folded dipole is related to a dipole. Invented by Fred Judd(G2BCX), the name was derived from its slim construction and the J type matching stub (J Integrated Matching).
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