Unless the amp was made for ATV, a typical ham radio linear amplifier's bandwidth is usually woefully too narrow to carry a 5MHz television signal, and most won't work outside the ham bands (6m, 2m, 70cm).
Theoretically you could try this setup instead (legal FCC/IC/PTT disclaimer intended and you've been warned, and if you're bright/dumb enough to try this you probably know the consequences
):
Cable head-end Modulator--->commercial cable distribution amp-->cable trunk amplifier--->single channel MATV antenna.
-the trunk amplifier is optional unless you need greater range.
-a real head end modulator is best since you can control output levels and it's true VSB, not a pro-sumer one.
-you'll need to use good quality coax cables like RG6 and RG-11.
-the antenna must be located in a manner that eliminates its feeding back into the amps, meaning away from the antenna. No rabbit ears here...
-older "~450MHz" cable amps that were used back in the day work better than the newer ones.
-stay away from ch4, as there are aeronautical users at 72+/- MHz and it would really suck if a 747 tried to land in your living room.
There's going to be a number of analog low power UHF translators going up for replacement (read: disposal) when the "event horizon" comes up. Most of these are solid state, have a proper "channel converter" to take channel "x" and make it into channel "Y", are reasonably compact and don't take up a room, and make some power (=range). If your head-end modulator can generate channel "x" the translator won't know the difference.
Enjoy...