I had a similar issue a while back.

Turned it off and disconnected the antenea altogether. Go into the menu and do an auto tune. This should wipe all your old channel locations.

then plug the antenea back in and do a search again. The guy I spoke to said it seems to work better if you don't already have the channels set when tuning or it tends to just select the same frequencies.

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Twin scroll Pig Bi-Squeeling