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Digital channels on analog basic?
1080p is too much data to broadcast (via either OTA or CATV), so you're only receiving a 1080i signal.
If your CATV company transmits digital (ATSC) channels unencrypted (most likely only the big 3 networks), then you can view them on your HDTV without a set top box. But most of the other channels are encrypted.
Note that OTA HD channels are actually better picture quality because the data is not compressed, as it is on CATV systems.
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