Cable television

If you are connected to any TV pay service like cable television, just keep watching your TV, everything will be fine even after February 17. But in some cases, if you watch free local channels too, using analog antenna (analog television set) – you still will have to purchase a TV digital converter box.
How do I know if I have an analog or digital television set?
Where i can get a tv digital converter?
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What is this analog to digital television transition all about?