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The short answer is "Move the antenna."
You are experiencing a multi-path due to some object in or near the signal's path. Since it is more evident during windy/wet weather, I will assume the antenna is probably behind a tree, the most common reason for this problem.
Antennas cannot resolve issues caused by unfavorable site selection so it's often necessary to, as our directions clearly state, "Before attaching the antenna to any surface, TEST RECEPTION in that area."
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