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The idea of modifying toy modulators (and that is really all they are) to run on the gamut of VHF band is a daunting task. The higher up you go in frequency, the more problematic it all becomes to get good clean well-modulated wideband color video on the antenna outputs. Industrial gear that already does this will soon be taken off the market, I suspect; but if you can find some used modulators such that the cable companies themselves or hotels might use, great. I am not sure how you would combine them on a single wire but again, there are likely combiners to do this in the used industrial arena.
I am the same person who speculated earlier about using a ham linear amp to beef up a toy modulator but on reflection, I caution that the transmit antenna and waveguide will be problematic for the amateur to rig up. Even if the linear amp could produce a big clean signal, it will be hard to load it properly while achieving wideband radiation. There is such a thing as ham TV and this would be the arena to find adaptable gear and expert advice.
--Tom
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