One RF on TV – what do I need for OTA HD and regular cable?

I have a Samsung 37 inch LCD TV that only has one RF jack on the back for coaxial. Right now, my Charter cable receiver (digital, standard) is going to it. I have an indoor antenna to pull in the OTA HD channels. I’ve heard that I would need a A/B switch (Radio Shack has a remote control one) to make it work. The only other jacks on the back of the cable receiver are yellow, red and white. Can I use those instead for the cable?
Is it possible to run the cable through an old DVD player as the tuner?

As long as your TV has a composite input (yellow/red/white), and your cable box has composite outputs, I don’t see why you can’t hook them up. Then run you OTA antenna into the TV’s coax connector. You may need to use the TV’s menus to select between antenna and AV inputs, unless the remote control lets you do that source selection – many do.

DVD players don’t have tuners, only DVD recorders. Your HDTV should have NTSC/ATSC and QAM tuners.