Let me add this:
If there's any chance that someone's lubed this with petroleum grease or
oil, it will tend to attract dirt and stick. I suggest cleaning all the
old lube off as best you can with either isopropyl or methyl alcohol.
Don't use ethanol because it can eat some types of rubber that may be
used as an insulator inside the antenna.
Silicon lubes are incompatible with petroleum lubricants, so that's
another reason to clean the stuff off.
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