said by JoelC707:
I wouldn't normally recommend this but I'm going to say run with the amp for a while. It doesn't really seem to be doing anything bad so leave it in and see what happens.
Thanks. Unless someone makes a convincing argument otherwise, I'm inclined to leave it be. TVs are all working fine, too. I tried putting a 75 ohm terminator on the open port on the amp, but it made my levels worse, so I removed it. Don't understand why that would happen, but whatever works...
I also am not running the coax through the UPS, as all that did was degrade the signal further. Any lightning surges coming in on the coax should be caught at the ground block anyway (one hopes).