Thank you all very much for this thread!
My DB2 antenna antenna received ten UHF stations with better than 90% (as reported by my SiliconDust tuner) - but (RF) 7 and 12 were unwatchable.
Following the advice in this thread, I added a Y5713 VHF antenna and UVSJ (and also a 6ga copper ground :-) and now signal strength on 7 is 95% up from 40%, and on 12 90% up from 75%. Thanks for the terrific and very generous help!
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