Welcome, acat:
Thanks for the tvfool report, the interesting antenna photo, and the xls file. I had trouble with the xls file. It downloads as a php file, so I had to change the file extension to xls. I then tried to open it in OpenOffice Calc, which didn't work (too many errors), but I was able to open it in Microsoft Excel Viewer.
KMGH ABC, real channel 7 and KUSA NBC, real channel 9, are on VHF-High channels. Your antenna is primarily for UHF channels 14-51, and doesn't receive VHF channels very well because it isn't tuned for that band and the baluns are probably printed circuit baluns that don't pass VHF signals very well.
You need to add an antenna for VHF-High and combine it with your HDB8X using a UVSJ, or replace it with a combo antenna that will receive UHF and VHF-High.
In addition, the terrain between Denver and your location has peaks that will block TV signals. If you click on a callsign in your report you will see a terrain profile. The transmitter is on the left, and your location is on the right.
KMGH
http://www.tvfool.com/?option=com_wr...dALLTV%26n%3d7
KUSA
http://www.tvfool.com/?option=com_wr...dALLTV%26n%3d8
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Anyway I am forced to face the reality that the gain in the VHF for the HDB8X must be 0 (or less) and have purchased an RCA ANT751R antenna to see if I can rescue a usable signal.
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The ANT751 has more VHF-High gain than the HDB8X, so it might give you 7 and 9, but I think you need a little more VHF-High gain than that for your 2Edge Denver signals. The 751 has less UHF gain than the HDB8X.
A suitable VHF-High antenna would be an MCM 30-2475 or 30-2476. They are inexpensive, have poor assembly instructions, but perform well.
http://www.mcmelectronics.com/produc...-2475-/30-2475
http://www.mcmelectronics.com/produc...-2476-/30-2476
UVSJ
http://www.solidsignal.com/pview.asp?p=uvsj
http://mjsales.net/products/tru-spec...ant=1198505857
https://www.antennasdirect.com/store...FUmRfgod9YAKRw
Don't buy the MCM 33-2230 UVSJ UHF/VHF combiner.
Aim the VHF antenna at 159 degrees magnetic. No guarantee because of the hills, but I think it will work.
A suitable combo antenna would be the Winegard HD7698P.