While you're inspecting the seals, be sure to lubricate the O-ring on that TV antenna. If you don't, the O-ring gets dry and lets water in.
Edit to add - from Winegard's website, for when water is coming in at antenna
Quote:
The first thing to do is to determine exactly where the water is coming from. Remove the ceiling parts once again and see if the water is coming straight down the shaft or if it is coming down the sides of the hole. If the water comes from the sides, it is coming from a hole somewhere in the seal on the roof or possibly not even from the antenna but migrating from elsewhere. If the water comes straight down the center shaft, then the quad ring in the gear housing has failed and needs to be replaced. The easiest way to replace this is to replace the entire worm gear and shaft. The kit part number is RP-4000.
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also worth mentioning - the rubber boot around the coax can rot and crack over time, allowing water in.