OK... I now understand the trouble with getting a #6 bonding conductor around the house. That makes your option 'b)' impractical.
I'm still not a fan of using plumbing as a bonding conductor between two ground rods. In the very unlikely event of a lighting strike, I don't want to have encouraged you to route the fault current through your home.
That leaves me with one option I can endorse, run the mast ground to the existing electrical service ground rod... keeping the ground conductor outside the building. Mount a coax grounding block close to the existing electrical service ground, outside. Run the antenna down-lead on the outside of the building, to the coax grounding block, after which the coax can enter the building. This approach avoids the error of building a path for fault current into or through the building.
Another reason I'm so reluctant about using the plumbing is, I have no idea if it's got plastic now or will have in the future due to remodel or repair.
If needed, preamp gain can overcome the additional loss in the added length of coax.
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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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