What is that in the photo, is it the VHF yagi?
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around 5 or 6 at night the reception starts to break up every now and then.
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Could be from a temperature inversion that helps the propagation when it is hot, but when it cools down the signal is weaker.
I still think tilting the aim of the antenna up might help. It would be a custom modification for the DB8, but there is a tilt adjustment on the 91XG and the HDB91X that allows you to tilt the front of the antenna up.