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Maybe I'm whack but I see it as a near-center fed fullwave with the bottom 1/4 wave inverted upward to invert & correct the phase & capture the other half of the bottom 1/2 wave.

 

Seems the cone section both captures and cancels the inner reverse-phase 1/4 wave current while it also compliments the upper in-phase 1/2 wave by radiating it's outward current as it's inward radiation cancels the outward radiation of the inner bottom 1/4 wave.

 

What happens when it's mounted on an insulator with a cmc choke in the coax wrapped just below the bottom of the cone?