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Marconi, the only question that comes to mind at the moment (at least until I see your email), is whether the point .625 and .75 that you refer to in the above post is the same as that to which SW referred. Are you both talking about these length in the overall lengths of the antennas, or from the cone ring upward.

When I built and mounted the Sigma antennas, whether 5/8, 3/4, or 7/8, I measured from the bottom of the antenna to the tip top fr those lengths.

Are you fellows on the same page here?