C.M.
A.,
Good for you for getting out of debt. That's awesome! Are you a Dave Ramsey listener? As Dave says, "Debt is Normal, Be Weird!" Looks like you're on your way!
Yes, I believe you will need an antenna, but you can get one that goes in the attic instead of on the roof from Radio Shack. Depending on how old your TV's are, you may also need a converter box in Feb. 2009 when the signal goes digital. Radio Shack should be able to help you with that also. I don't know the cost of either one. I believe there is a website where you can get the converter box free, but I don't know the url. Sorry, I'm not much help. But I'm sure someone at Radio Shack will have all the info you need.
Good luck!
C.