Given the nature of your system, I would suggest you use RG-11. For design purposes, allow for 5 dB loss per 100'. (If you are also using RG-6 in some parts of the system, allow for 6.5 dB loss per 100'.) Quality passive splitters will almost always be labeled with the per-port loss value. An 8-way splitter would be expected to have about 10 to 12 dB loss.
All of these individual component losses can simply be added to give you the expected loss between the antenna and a given tuner.
The gain of the antenna will overcome loss elsewhere in the system. A preamplifier or distribution amplifier may be appropriate under certain circumstances. We would need to see the TV Fool signal prediction for your location to know if an amplifier would be appropriate.
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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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