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Properly grounding the system per NEC will have no material effect on received signal power.
Keep in mind that, for locations very close to and below the plane of the broadcast antennas' main radiation lobe, signal levels will be markedly below those forecast by LRI calculations. I've measured values up to 30 dB less than calculated when testing very close to the broadcast tower.
The OP is 1.7 miles away from the (imaginary) base of the antenna and about 1000' below the center of radiation. Most of the radiated signal is above his head and the numbers in the plot are incorrect in this type of situation.
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