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shockwave, just an thought,

if the sigma style antenna had an almost none radiating lower 1/4wave and you phased a second radiating element on top you would expect similar results to the super j-pole,
im not so sure the super j does provide the claimed extra 3db gain with such a small vertical separation between radiating elements but that is what is claimed in the few texts i have seen,

on the other hand if the lower 1/4wave does radiate combining in a constructive manner with the upper 1/2-5/8wave you would never see a 3db increase by phasing a second 1/2-5/8wave on top,

could your 1.5db measurement shed any light on how much the radial sleeve does or does not contribute to the overall gain,

i wonder how much gain the second element really adds in the super j-pole.

[QUOTE="bob85, post: 172588, member: 18"] shockwave, just an thought, if the sigma style antenna had an almost none radiating lower 1/4wave and you phased a second radiating element on top you would expect similar results to the super j-pole, im not so sure the super j does provide the claimed extra 3db gain with such a small vertical separation between radiating elements but that is what is claimed in the few texts i have seen, on the other hand if the lower 1/4wave does radiate combining in a constructive manner with the upper 1/2-5/8wave you would never see a 3db increase by phasing a second 1/2-5/8wave on top, could your 1.5db measurement shed any light on how much the radial sleeve does or does not contribute to the overall gain, i wonder how much gain the second element really adds in the super j-pole. [/QUOTE]

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