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I believe it's basically a Vector 4K, a half wave very efficiently matched and elevated 1/4 wave by the 1/4 wave matching system at the base, consisting of a 1/4 wave down and a 1/4 wave up which, when added together, the 1/2 wave radiator and the two 1/4 waves comprising the base cone area, you have 1/2+2/4=1

or 1 full wavelength


lol