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In my own system at my home, I have an unamplified FM-3 merged with a 91XG/PA18 combo with one of our U/V diplexers. That signal is sent to the basement (80' with two TV/Sat diplexers in line) where it is distributed using one of our CDA4 distribution amps to all the sets in my house (25-70' per run) including several runs with an addition 2- or 3-way splitter. My signal mix coming from the antennas includes mostly very weak UHF (with one very strong one) and a mixture of weak and very strong FM signals.
I've used direct connections of the combined coax signal at each termination (TV tuner or FM receiver) without using any type of FM separator/filter and there have been no ill effects on any of the service drops from having the FM and UHF on the same cable.
For my setup, there have been no deleterious effects from running the FM and UHF TV signals over the same cabling. YMMV. If I had VHF in the mix, I'd need to exercise additional cautions.
If you are in a situation where you want to only amplify UHF and not VHF but must get operating power through the UVSJ, you must select one that is DC POWER PASS on the UHF port. To date, I have identified the Radio Shack 15-2586 and our own EU385CF as meeting this criteria. The popular Holland and Tru-Spec (Pico-Macom) diplexers pass power on the VHF port, but not the UHF port.
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