On February 17, 2009 all full-power broadcast television stations in the United States will stop broadcasting on analog airwaves and begin broadcasting only in digital. (http://www.dtv.gov/) So what do you need to do?
If your TV has a digital tuner — Nothing
If your TV does not have a digital tuner, and…
you have satellite service — Nothing
you have cable service with a set-top cable box — Nothing
you have cable service without a cable box — Probably Nothing (Check with your cable provider to make sure.)
your TV is connected to an antenna on your roof or on the set itself — Converter Box
OK, good to know…now what?