I purchased a used 2720 and could not get any reception. I found that all of the coax connections had not had their shielding exposed. Every connection from the antenna down to amplifier had to be repaired. It took me about 20 minutes to make the repairs. After the repair, I was able to get good quality signals on 23 channels. It’s obvious that this unit came this way from the factory, and the previous owner(s) were oblivious to the fact that they never had any TV reception. If this is your problem, and if the factory still uses the quick connectors, it will be an easy fix. I hope this helps, 92cabby
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