With the right equipment, you could no doubt measure a very minimal amount of loss through a grounding block. I would expect less than 0.5 dB loss... Not enough to worry about. If that was enough to cause trouble in your system, you have other problems than need to be corrected in order to ensure reliable reception.
Cheers 
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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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