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The ATSC tuner tunes OTA channels (antenna).
What you are likely seeing is the result of the QAM tuner, which many new HDTVs have. See the Digital Home FAQ
http://www.digitalhome.ca/forum/showthread.php?t=32271
You didn't state the make/model of the TV, so I cannot confirm.
What you are likely seeing is the result of the QAM tuner, which many new HDTVs have. See the Digital Home FAQ
http://www.digitalhome.ca/forum/showthread.php?t=32271
You didn't state the make/model of the TV, so I cannot confirm.