You are deeply shadowed by the bulk of the terrain. I've found that TVFool's forecasts tend to be over-optimistic when you're so close to the intervening terrain obstacle.
The 91XG is about the best choice for your location for the UHF stations (relatively) overhead and behind the bulk of a mountain. It probably won't get KGUN's VHF signal, but you never know. Bore-sight the boom of the 91XG at the visual horizon as a starting point.
Also, keep in mind that a number of your local stations operate translators from the other side of Tuscon due to the difficult terrain on the north of the city. You might try re-aiming the U/V combo WSW and re-scanning to see if you can pick them up.
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