If you are using the Polaroid antenna for UHF only, and the Channel Master for VHF only, you can combine the two antennas with a UVSJ after the Polaroid power supply, but before the splitter.
https://www.antennasdirect.com/store...Combiners.html
But I think you should still try a preamp near the CM antenna for all channels.
Quote:
The new DB8e isn't working real well for UHF, at all.
I don't think I've gained much of anything that I didn't have before.
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Did you try a preamp at the DB8e antenna?