Joe:
Thanks for posting your exact address report; not much different than the original one.
In theory, the new antenna has a good chance of bringing your NM above zero, which would make reception of your weakest desired signals possible.
Does your TV have a signal strength indicator? That would be a big help when aiming your new antenna, after first doing an approximate aim with a compass.
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If I do not get the Fox and NBC stations I don't know what to do from there.
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The next thing to try would be a slightly different location in a horizontal direction, especially if there are any trees in the signal path. Moving my 2-bay UHF portable antenna in a horizontal direction made a big difference in signal strength in this test setup:
On the table: 12v 125w Exeltech inverter, CM7777, preamp power supply, and Sadelco DisplayMax 800 signal level meter. The final adjustment of antenna aim and location was to maximize the pilot signal which is the peak at the left end of the channel scan. The tuner locks on to the pilot signal:
What TV are you using? Some TVs have better tuners than others, which can make a difference in areas with marginal signals. My SONY KDL22L5000 has a tuner that is about equal to the better converter boxes. The tuner in my more recent KDL22BX320 is a little better by about 2 dB. My best set is a new KDL32R400A. I like the SONY TVs because they have a diagnostic screen that gives relative signal strength, SNR, and errors; the last two being indicators of signal quality.
In order to compare tuners, I connect two sets to a splitter and reduce the signal before the splitter with a variable attenuator to see which set drops out last. I don't know of any published test results comparing tuners, so I must make my own tests to avoid wasting money by trial-and-error testing. It doesn't do any good to connect one set to your antenna, and then substitute another set, because OTA signals are constantly changing in strength, which would lead to false conclusions.
After that try more height.
What gives me hope is that you can get Fox and NBC some of the time with your present antenna.
Have you looked at this thread by kenj66. He is also trying the 91xg:
Difficult location 15 miles west of Seattle
http://forum.tvfool.com/showthread.php?t=14593
Take note of the tilt feature of the 91xg.