860 is licensed to Troutdale, OR. 1550 is licensed to Vancouver. That dogleg in the 860 pattern was needed to put city grade into Troutdale, achieved with the tower at the top left and the leftmost of the three in line towers which put better signal over Vancouver and parts of Portland.
The main nulls at 335º and 170º make north and south coverage dicey no matter where you put the antenna site.
Diplex off of KXTG with main lobe going west from their east PDX site with north dogleg to Troutdale…know their close to each other on the dial but have been seeing some close dial position diplexes out there these days…and would take a few bucks to perform.
The third null is at ~45º (protects CBKF Saskatoon) and if you put the antenna at KXTG in Damascus it would prevent signal from going in the direction of Troutdale. Look at the linked pattern and visualize moving the center to where you suggest, it’s pretty clear that the null would point right at Troutdale.
I don’t know what was wrong. The first one worked fine but the second one gave me an error message. I tried it three times before posting. I just tried it again and it’s fine. I think it had something to do with Firefox. Thank you.