I had taken the twin-lead antenna wire off of mine and connected it to a gizmo (radio shack) that converts it to an "f" connector, and just ran the wire to the tv from there. not pretty, but it worked. my outlet is in the overhead cabinet over the fridge, though...may be a different location than yours. Anyway, I just had some loose wires in the cabinet as a result. mostly out of site.
I just replaced the original outlet w/ a new one. the plate has a catv jack, as well as the 12v
receptacle, but on the inside, it also has a signial amplifier. I installed this and used the same 300ohm-75ohm converter to connect the antenna wire to it, so now I have a "cable style" jack. And the signal amplifier works, too!!
I'm actually quite impressed...I can pick up quite a few more stations now than I could before.
This new outlet also has a place to run another cable for an external catv connection. not sure if I want to go to this extent, but it enables you to have a single place to hookup your tv set, and receive either cable from the campground hookup, or use the antenna. As Brett said, I'd have to install an external catv input, and run a wire from that point to the new wall plate.
up until a couple of weeks ago, I used a special piece of flat coaxial cable that is meant to be dangled out the window. the idea is that you can close the window (and/or screen) on it. run a regular lenght of coax from it to the campground hookup on the outside...and another from the inside end to your tv. it worked, for a little while. but there's a reason that coaxial cable is round...its not just a matter of having a continuous copper conductor running from point "a" to point "b"; and coaxial cable is much more fragile than it would appear. it doesn't like to be "squished" in a closed window. anyway, after a few uses, I started getting alot of interference...lousy picture, etc. finally figured out it was the lousy connection created by this flat wire. so I wouldn't recommend it...then again, they're only a few bucks at most RV stores, and it might get you through until you have a more permanent solution installed in the trailer.
here's a link to the amplifier: http://www.dyersonline.com/merchant....26+Receptacles