The 2 antennas seem a bit close & may be interfering with each other.
If in your shoes I would remove the UHF antenna & lower the VHF antenna in 6 inch increments to see if you can find a better sweet spot. Concentrate on finding the best spot for VHF, then add the UHF antenna above or below it depending on where the VHF antenna ends up. Higher is not always better.
Anyone else think this is worth a try?
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