I am trying to set my computer monitor as an HDTV because my graphics card has an S-video slot. So I’m thinking about running an S-video cable from the graphics card to my RF Modulator. Then I can have a cable going from the RF Modulator to the digital converter box. Then I would plug the antenna into the converter box. Would that work or would I need a TV tuner?

I just need to know what is the best and cheapest converter box to turn my LCD computer monitor into a TV . I have cable , and i think the picture would be really good on this monitor . I tried a cheap Chinese one and the picture is fuzzy , and there is no sound .
I want to do this without a Computer . Just the Monitor . Sorry for any confusion .