Thanks for making another test.
Tuners will vary a lot with their ability to capture weak signals.
How good is the reception quality with the other 45% tuner?
What is the other tuner?
You are just inside the KTTV FCC Minimum Field Strength Contour. The coverage is very spotty because of the rough terrain:
I think your location is just above the arrow where there is no color.
The link to the Longley-Rice coverage map for KTTV:
http://www.rabbitears.info/contour.p...=1423068&map=Y