Q: Biquad Antennas

I've decided to build one of these guys, and have been looking at the several
annotated web sites that describe the modest construction details.

Unless I'm missing something, they differ in one possibly critical area: on
some of them the N jack seems to be electrically connected via screw or
solder to the metal plate (is that a ground plane?) In others, the N jack is
clearly isolated from the metal of the plate.

Is anyone here well versed in antenna theory to assert which of these two
possibilities is optimal?

Art
.

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