One of the problems that can occur if the antenna isn't periodically lubricated with some silicone spray is it can leak water and leaks are the bane of RV owners.
The hand crank inside the RV that raises the antenna has a shaft that extends up into the antenna mechanism through the roof and is sealed from water leaks by a rubber "O" ring. The "O" ring requires lubrication with silicone spray every six months to keep the "O" ring from drying out and becoming brittle. Once it gets to that point, the only cure is a disassembly of the crank shaft and installing a new "O" ring.
Here is a poor picture of the Winegard instruction on the lubrication site. Click on the picture to make it bigger.
A .pdf file of the Winegard instructions and maintenance manual can be seen here.
Scroll down to page 4 and you can see it better.
Just a quick tip to prevent a source of leakage. Now when you get up on the roof, you can overlook your whole RV. ;c)
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