Is reception of a MeTV outlet your reason for going after KOLD or KAZT? If so;
Option 1: the weaker of the two signals, KAZT, real CH-36 is not troubled by adjacent or co-channel interference... An Antennas Direct XG-91 and CPA-19 preamp would be the tools I'd choose to go after their signal with. The big XG-91 will be plenty of antenna for the rest of the major Phoenix UHF stations but you'd need a High-VHF antenna such as the Antennacraft Y-10713 to see the signals from KAET, KPNX and KSAZ.
Option 2: Use a combination H-VHF/UHF (covering CH-7 and higher) aimed at Phoenix. The HD7694P and HD7696P have already been suggested but the larger HD7698P would be even better IMO. IF you don't get KAZT reliably using this option, you'd be facing the choice of giving up on the HD769XP and replacing it with the XG-91 or, giving up on KAZT and going after KOLD. To go after KOLD specifically, You would need to mount an Antennacraft Y-10713 high (10' - 12' above the roof line) and possibly
stagger-stack a second identical antenna too improve the rejection of adjacent channel interference from KPNX.
If it came to the point that you needed a multiantenna system, you'd need to use an A/B switch or external DTV tuner to select the antenna pointed toward Tucson.