AVS Forum Special Member
Join Date: Mar 2004
Location: Small Town X, HDTV Land
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I'd say your ABC, CBS and OPB broadcasters are weak or your attenna is trash. Please for the love of god do not use a cable TV amp!!!! Go onto ebay or amazon and buy yourself a Zenith Silver Sensor indoor antenna. It's the best antenna on the market and is one of the only ones out there that is actually designed to specifically receive digital signals (unlike all the copy cats). It cost about $15-20 also! Try this one first then you can move onto bigger outdoor antennas. I wouldn't be surprised if these channels are "in-the-clear" on your QAM tuner on your cable system. They would be in the 500, 600, 700, or 800. If the regular channel number was 6, say for NBC, the digital cable channels number would be 506.
Do yourself a favor and upgrade to HD cable. There are quite a few wonderful HD channels that are totally worth their weight in gold. You have the TV, now get the services to make it work!