Yes, the HBU22 would probably do the trick, but I like to go one size larger to make up for bad weather, trees, houses or anything else that may cause signal interruptions. I also like the Winegard HD series because they have a weatherproof 75 ohm ready connection.
I would guess that the maturing trees in your area are causing the signal irregularities you are experiencing, especially since it is only affecting the UHF channels.
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