TV Distribution Amp Setup for Charity Garage Sale

[toxcrusadr]

I could use your thoughts on this. I help out with the electronics at a large annual one-day garage sale for Habitat for Humanity. We get a lot of TVs donated. We're taking steps to accept fewer of them and market the ones we get a little better. One thing is to get them playing.

I was thinking of a distribution amp or modulator (Blonder Tongue Agile like the AM 60-450) or I found a Holland Modulator on ebag as well. These have coax 75 ohm output which I can split to run several sets. People say online that they have enough RF output power to run several TVs at once.

My problem is with the inputs. The BT has an RCA audio input jack and a 75 ohm video input. I can't figure a simple way to feed both of these. If we use a DVD player it will have analog R/L audio and composite video outputs - no 75 ohm RF video output. I could use an antenna and get local OTA HDTV, but then I'd need a converter box (these are tube type TVs). That would give me analog channel 3 over a 75 ohm coax, but how do I feed the analog audio input on the BT?

The Holland (HPM55) has 75 ohm coax inputs for both audio and video - gack - ?! No idea how to feed audio to that input. There aren't good manuals out there for this gear, I think the CATV pros just knew what they were doing and had the right eqpt to feed these.

I'm thinking maybe I should abandon the pro gear and just get a cheap consumer grade distribution preamp. I just don't trust the quality of mass produced junk with those cheap little wall warts.

Suggestions welcome.