Provide an umbrella for your TV antenna rotor.
Outdoor elements are the enemy and a properly placed shield can prevent rain, sun, snow, and ice from doing damage to your rotor.
You first must purchase a plastic funnel. The narrower end (neck) of the funnel must start smaller then the the mast pipe size but as it widens it must become larger then the mast pipe. Its bottom end opposite the neck must also be wide enough to cover the rotor motor housing.
Cut the neck of the funnel so that the hole in the narrow end of the funnel is of a size so it fits tight around the mast pipe when slip onto the pipe. Next paint the funnel so that it will be protected from ultra violet rays and keep it from becoming brittle in the sun. There are paints available now that adhere to plastic very well.
When the paint is dry install your rotor umbrella by slipping the reconfigured funnel onto the pipe between the antenna and rotor down to a point within an inch or two of the top of the rotor. Lastly put a bead of silicone around the top edge of the funnel to seal the funnel to the mast pipe just for insurance that no water can trickle down. You have now created an umbrella for your rotor motor protecting the pivot point, the rubber seals, bearings and U - bolts the elements that can damage a rotor. This will also prevent rotor freeze up in colder climates.
See the image below ↓