Several possibilities...
A fault in the amplifier or TV power supply.
Does the coax run close to a power line? If so, it could be coupled via induction.
A volt-ohm meter would be a useful tool to track down the source
Is the coax shield grounded?
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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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