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You paid a lot of money for an HDTV. But you may not actually be seeing high definition programs. How can this be?

You see, it's not enough to just buy an HDTV receiver. You must be able to receive programs that are broadcast in HDTV.

For example, many local stations are broadcasting some programs in HDTV. But to see these programs, you must either live very close to their broadcasting towers or have a special, HDTV antenna on your roof.

If you subscribe to "analog" cable, y...