You're going to need a VHF antenna added to the DB8e. It was never intended, designed, or sold for VHF reception.
You can try the VHF-1 VHF retrofit kit which should have a fair chance of working okay, but you may find that a more substantial high-VHF antenna is required.
You've likely got too much amplifier there, the 7777 isn't intended for locations with moderate to strong signals. Try the system without it.
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