[old_tv_nut]

Cat-5 cable has 100 ohm impedance, and can cause reflections (ghosts or frequency suckouts) when used with TV gear, which is 75 ohms unbalanced coax or 300 ohm balanced twinlead. Not worth it to save a few $$ by installing possible problems.

Edit: in addition, unshielded leads can have a problem if routed along metal, like electrical conduit. Coax, with a 75-300 ohm "balun" transformer if needed for your TV, is the best way by far.

("Balun" is a contraction of "balanced to unbalanced" and it works in either directiion, but in TV gear the unbalanced side is always 75 ohms and the balanced is 300. Professional signal analyzing equipment is often 50 ohm unbalanced, and needs different matching transformers or pads to connect to common 75 ohm cable. I see RS has a balun for sending baseband video (NOT RF) over CAT-5, but it costs $25. Again, better to put the money into cable and use the less expensive common 75-300 ohm balun if you need one.)