Though the DB8E is not a Double Bay Gray-Hoverman, it has very comparable performance. If you have a GH that's in good shape, use it to see what you can pick up.
I'd try testing with no preamp, just a 50' or less cable and a good tuner. Reliable receptin starts with the antenna and it's location/aim. The preamp will not improve the performance of any antenna. Use the preamp to overcome the loss in cable and splitters.
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