I assume that the
windvane shown in the picture is made of all plastic
parts. If not, and any large metal
parts actually contact the
antenna, there is a good chance of significantly increasing reflected signal (i.e. a bad mismatch) and decreasing radiated signal.
The standard
windvane comes with a mount for the top of the
mast, where the vane itself is on the end of a boom about 18" long and it's best to orient it so the boom points out forward of the
mast for clear air. That arrangement allows the
VHF antenna to be located close to the mast top - where it is designed to
work best.
BTW since my previous post I did some computer modeling of an antenna located on spreaders. Turns out it is quite a poor location and severely degrades the performance.
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