Hi Beans,
If you get rid of the set top box, and cancel cable service all together, you'll need to use a converter box (if your TV is analog), and an antenna.
If you get rid of your set top box and downgrade your service to basic cable service (packages run anywhere from $15-$50/month), you'll still be able to plug your TV directly into the wall with coax, and receive limited programming. With basic cable service, you should be fine for the
DTV transition in February because most cable providers are still going to provide analog signals to households for ateast 3 years after the transition. Confirm with you cable provider.
You may want to reference this thread when you get a chance:
http://www.dtvusaforum.com/converter...igital-tv.html