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No. It is because of the skin effect of the rain. RF flows over the surface of a conductor, not through it, so anything on that surface will impede that flow. Like insulated wire, rain covered wire/metal tubing appears electrically longer to RF, lowering the resonant point of the antenna.

[QUOTE="M0GVZ, post: 602406, member: 22312"] No. It is because of the skin effect of the rain. RF flows over the surface of a conductor, not through it, so anything on that surface will impede that flow. Like insulated wire, rain covered wire/metal tubing appears electrically longer to RF, lowering the resonant point of the antenna. [/QUOTE]

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