Great topic.
Here's my thoughts on wind direction:
Minus the factors of strong winds and terrain, your sounds from your calls are traveling outward in a circle pattern, with you in the middle. A coyote can come from any direction. Now, 3/4 of the time they will swing around and come from downwind. Why wouldn't you want to be facing in the direction that gives you the largest chance of seeing your quarry? Why face upwind when chances are higher, that they will want to 'backdoor' you? The only 'backdoor' that is created is the one where you decide not to face. I almost always choose to watch my downwind side. I changed my tactic about 3 years ago and am quite satisfied.
That being said, I do utilize terrain to give me shooting lanes on my cross wind sides.
Just my thoughts.
