It's in the
form of a halo - circular plastic ring holding a metal ring with a gap at
the bottom where the coax is connected. It has a fold out stand at the bottom. I wondered if having a bottom feed would make it horizontally polarised like a folded dipole
If the feeder is simply connected across the gap in the loop, with
nothing else there, it is probably being fed against the braid of the
cable, i.e. the cable outer is actually part of the aerial. That might
well result in significant vertical polarisation, whereas, if there were
a true balanced feed, it would have to be horizontal.
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