Recently, my roof-mounted Winegard satellite dish became VERY HARD to rotate to the proper azimuth.   After consulting the installation manual, I discovered that the base of the satellite dish is supposed to be sprayed with silicone lubricant twice per year.   The satellite dish rests on a big nylon bushing which needs to be lubricated.   While you are up there, spray some lubricant on the worm gear for the elevation control.
-Submitted by Bob Cook