Let's back up a bit (or move sideways) and focus only on the lack of VHF reception for a moment. Those would be channels 7, 9, & 12 (13.1) from Denver which your analysis shows should be quite strong, even a capable set of simple rabbit ears should pick them up. Since you can't get them and they *should* have been "easy", perhaps that needs to be investigated to see if you have a faulty tuner or some local interference that made your two previous attempts fail.
Do you have any other TV sets available that can be tested?
What specific antennas did you try indoors? Adjust the dipoles so they are horizontal, about 26-32" tip to tip, and are oriented so that they are perpendicular to the direction the signal comes from. Some cheaper indoor antennas from RCA and GE don't obey this advice...
Are you able to move the antenna further from the TV set (yeah, they can interfere with their own reception, especially on VHF) and place the antenna in front of a window that faces Denver? You may need an extension coax and an F81 coupler to do this. Make certain the window does not have a metal window screen installed. If the glass has a low-E metallic coating, open the window for testing.
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So back to the other question about how far down does a co-channel interferer need to be for 8VSB?
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See section 5 of
http://www.atsc.org/cms/standards/a_74-2010.pdf
For a primer on combining antennas, see
http://www.hdtvprimer.com/ANTENNAS/merging.html
Explore the "Diagnostics" option in the "Channels" menu of the Sony and see what it does.
As an experiment, set Cable to "ON" and run the auto program. See if channels 7-13 come in, ignore the lack of UHF channels