Thanks for the update.
Given that the DB4e was engineered as an optimized CH-14 to 51 UHF antenna, with a narrowed bandwidth compared to older CH-14 to 69 or still older 14 to 83 antennas, it's to be expected that it will reject CH-13 (a feature). Some of the DIY 4-bay antennas are actually fair at receiving some signal in the CH-7 to 13 range.
As you tweak the aim, signal quality takes priority over signal strength. When in the clear, I expect significant improvement. in both quality and strength.
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