Yep! The Seiki only supports an ATSC tuner. That works with Over The Air signals. Many cables use QAM tuning. There is a difference. You can go to your local Radio Shack and get a converter that supports both QAM and ATSC.
Unfortunately, without doing some in-wall rewiring, it means that you will have to run the cable line in a window to the converter and then feed HDMI output to your TV.
The other solution is to swap the TV(s) with ones that have QAM tuners.
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