Thank you, found a solution.
In order to get the best possible picture quality from the plasma screen I wanted to use the component RGB(best connection on this model) so the demodulator box was not my preferred solution. I researched like crazy and finally found a DVD/VCR combo player made by Panasonic(Model#DMR-EZ48V) that still has a TV tuner inside(screw-in cable IN) as well as an RGB out to the plasma. I'm getting mostly HD channels with this set-up and it looks quite good. Thanks again for your help.