Do you have a cable-ready TV that only has "F" inputs?
You need something called an "RF Modulator". This little box runs about $30 and takes L/R/Video in and converts it to Channel 3 or 4 that you can feed into your TV with a cable with F connectors.
You can get these at Radio Shack or any department store.
Thanks for the input. I looked around on the Crutchfield and Radio Shack websites but I wasn't sure what exactly I was looking for.
What's the line from Vacation... "That there is an RV."? My parents have an RV with a TV in the bedroom and a TV in the living area. They are wanting to replace the VCR with a DVDP. Everything is run through a switcher with F connections.