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A preamp only helps with the losses in the coax and splitters attached on the output side of the amplifier and in the case of a poor quality tuner that has a high noise-figure. Amplifiers can't differentiate between useful signal and noise so they will amplify both, and on top of that the amplifier adds some noise. So you are actually loosing ground if you try to make up for antenna performance with an amplifier.
If you can't see a reliable signal with the antenna, a short run of coax and a single TV, you need change the antenna or where it's mounted/aimed. Only when you have a reliable signal in that test configuration should you decide whether amplification is going to help or hurt.
Given that you already have the RCA ANT5751R which includes reception capability for real channels 7 through 51 you could opt to combine it with a large UHF only such as those already mentioned. A UVSJ (UHF/VHF combiner) and coax cables are all that would be needed to accomplish that.
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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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