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Where are you and which cable box do you have?
Is there a cable box on that set? If not, the system there has gone all digital and you'll need to get a DTA as a minimum to continue watching anything on that set.
They probably moved the Qam channels around again. You'll have to do a channel search on your tv.
Try channel searching again. They just moved stuff around on us a few weeks ago. Eventually you will need equipment though.
Yes, rescan for channels first, if nothing you need a little cigarette pack type adaptor for even basic.