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teleview's caution is an important point, be sure you are using a UHF/VHF combiner, not a regular splitter...
Ideally, the preamp should be located close to the antenna. This presumes that the signal level at the antenna is not so strong that it would overload the preamp.
You can try the preamp in two different configurations. The first and perhaps easiest to understand option locates the preamp at the output of the UHF/VHF combiner (which I presume is located close to the antennas).
If you have strong, reliable reception of all the VHF signals, you can likely skip the use of a preamplifier on the H-VHF antenna. RG-6/U will have significantly less loss at VHF frequencies than at UHF frequencies. This means that you can still have a strong VHF signal at the TV but have trouble with UHF frequencies being attenuated.
The Radio Shack 15-2586 UHF/VHF combiner passes power from the common port to the UHF port (not all other UHF/VHF combiners do that). So, option 2 would be to locate the preamp close to the UHF antenna (between the UHF port of the UHF/VHF combiner and the antenna). Power can get from the power inserter & supply, through the 15-2586 and to the preamp on the UHF side. This option may help 'balance' UHF and VHF signal levels, which may reduce inter-modulation distortion in your system. Another benefit of this option is that FM signals are going to be received a bit better by the H-VHF antenna (though it's not designed to cover that frequency range well)... amplifying only the UHF antenna signals will reduce the potential interference from FM stations.
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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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