To lower the rain loss on parallel insulated feeders is why "Antenna
wax" came to be. If you wax the insulation such that it does not allow
water to stay on the surface, you can overcome the wet weather losses.
The wax causes any water to bead up in droplets, isolated from other
droplets, instead of a sheet of water. Any feeder will shift
performance in wet conditions, extreme heat, or cold, that could affect
its dimensions as well. Luckily, things keep working well enough in
spite of these issues. Just make sure the wax is compatible with the
plastic you are trying to weather proof.
-Stuart Rohre
K5KVH
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