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I agree with Tim... If you opt to add a ground rod, it's necessary that you bond it to the existing electrical service ground system. It's not just some arbitrary 'code' issue. As Tim said, without a solid connection with rather heavy gauge wire, there can be problematic or even dangerous voltage differences between your antenna system and the rest of the existing grounded electrical system in the event of an electrical fault.
When you consider the cost of running #6 or heavier wire from your antenna system + new ground rod, it usually makes sense to skip the added rod... simply run a #10 AWG mast grounding lead back to the existing electrical service ground and spend the time and money to run the coax parallel with the mast grounding wire... grounding the coax at the existing electrical service. For most newer homes, this also makes sense because the pre-wired cabling in the home terminates near the electrical service meter & it's grounding system.
Adding 100' of coax will result in some attenuation, but a good quality preamp can overcome all that loss and provide for splitting to multiple sets. The Antennas Direct 'Juice' preamp is nearly a 'universal' application preamp.
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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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Last edited by GroundUrMast; 22-Jul-2019 at 6:29 PM.
Reason: long coax -preamp
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