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Generally, UHF and VHF antenna systems are isolated from ground at their operating frequencies and therefor will not see much effect to their performance if grounded or not. My suggestion to ground the antenna mast and coax shield is primarily motivated by a concern for safety.
Your report suggests there could be the potential for overloading. Give that you are quite close to the towers, I suspect you may also be facing strong FM signals which can be a source of interference.
So, make certain you are not using any sort of amplifier, including one built into the antenna. Try adding an FM trap to filter out some of the FM signal.
If that fails, try the antenna and trap outdoors.
What's the make and model of the antenna?
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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