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RG-6 coax will have roughly 1 dB loss in 20'. Each dB of loss between the antenna and amplifier will reduce the overall system noise figure by the same amount. So you certainly want to avoid putting the amplifier at the end of a long run. If the temp never exceeds 90° F, I would not be worried about the amplifier, but much over 100° would start to make me take steps to protect the amp.
Again, the 15 dB gain of the CM-3410 is more than enough to deal with the splitter and cable losses in almost all residential applications.
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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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