Without a working link to your TVFR, I can only comment on the UVSJ. You'll loose very little (a dB or less as I recall) with a good UVSJ. Unlike a splitter that divides available power over a wide range of frequencies, a UVSJ is a filter network that has dedicated input ports, one for UHF only and the other for VHF only.
I would not hesitate to use a good UVSJ ahead of a single input, broadband preamp.
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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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