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Antennas are a special case
@Electron, I'm glad you're not advising against grounding the antenna.
Unlike a metal roof, air conditioner or plumbing vent, an antenna is expected to be intentionally connected to one or more devises inside occupied space. Proper grounding of the mast and coax serves to reduce the likelihood of dangerous voltage appearing on the coax and TV chassis inside the building.
As an aside, air conditioner units, regardless of where they are mounted, are typically supplied by a dedicated circuit, the cabling for which includes a ground conductor. Also, metal water supply lines and metal drain pipes are required to be electrically bonded to the electrical service ground system.
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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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