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Ron,
The 3rd LNB is the HD on mine. When I upgraded to HD service it is the one they brought out.
Cobrabill,
The antennas will still pick up the signal, but the older tech TVs will not decode it. The Signal transmitted is still Analog, but it has been digitally encoded. If you have an HD TV and you use your same antenna, then you will be able to get your local stations in HD.
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