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The DB4e is a design optimized for real CH-14 through 51, it also has a broad forward beam compared to 8-bay antennas.
The DB-8 is has a relatively narrow forward beam and is an older design optimized for real CH-14 through 69.
The two antennas are very close in gain performance.
Try for no less than 3' of separation between the UHF and H-VHF antennas. More separation will result in less interaction between the two antennas.
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