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I doubt you need a pre-amp, maybe a low power distribution amp/splitter to drive the 3 receivers since you will be close to 100' of cable.
Use the existing VHF/UHF combo for your VHF stations it's aimed correctly for them now. Combine it with the UHF with a USVJ to a single feed cable to your grounding block and then the splitter/distribution amp/splitter.
You will need to use the trial and error method to locate your antenna to get the best path through the trees. Moving it left/right and up/down as little as 3 feet sometimes can make all the difference in getting a usable signal through all the multipath from the trees.
If they are all hardwood at least winter will let through better signals when the leaves fall.
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