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Mine do, on the base. I dont know much about it, but my Imax has gone from flat 1/1 to 1/ 3 over the past few days. It has been raining here for a week! Still not bad, but it has changed.
I'm told by guys who set SWR's, that they won't do it if the humidity is real high or it has been raining because it gives a false reading. Supposedly the rain will increase the amount of actual grounding that the antenna sees. Atleast that is what I have been told. 73's
If you get water in your coax because of rain, SWRs will definately go up. To prevent this, use Coax Seal or RTV Silicone around the PL-259 connector at the antenna. It probably should be resealed every year, right before the rainy season, as well.
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