A trick I use at my house:
I went to wal-mart and bought one of those super-crappy (and cheap, like $20) VCRs. I opened it up and ripped out the modulator.
Now I just plug in one of the composite outputs (audio & video) from my DVR into the input on the VCR modulator. Then just split the output from modulator into TV cable. From their it's split into my whole house.
Now on any TV in my house I can look all around on CH 3 (w/sound)! On my modulator I could even adjust the frequency to about CH 2-10.
Of course you can just keep the VCR all intact, just a lot bigger box...