I hope someone has some experience with this... I own an old (4+ years ;-)) house that I unfortunately did not build so as you can guess, the wiring is inadaquite for my HD setups. After trying unsuccessfully to pull a second cable from the attic to the living room I am frustrated by not being able to watch one channel and record a second one on my HD250. But, I have one last option... I do have a cat-5 run to the same location. I am set up for wireless so it's not a big deal to lose the net connector. Can I use a Coax to RJ45 Balun? I would be running one coax line diplexed with an OTA HD antenna and the second DTV line would be on the cat-5 run. Would this do the trick? Thanks in advance.