The Accessories on the
Antennas Direct 91XG site show a
Mast Extension, but I can't find this middle section. Where did you get yours from?
I'm not using a separate antenna for ABC 7, but Channel 7 is strong enough I could set a bare coax wire up there and pick it up. Even though the 91XG is only a UHF antenna, Channel 7 is one of my most reliable signals.
I did aim my antenna with a compass, my old Marine Corps compass, in fact, that includes a very helpful aiming mechanism.