You'll get all kinds of opinion about how to use the wind. Naturally, the rules change some at night since you want to be able to see the coyote's eyes when he comes in to the sound being used. In daytime, it is a bunch different, or at least it is for me. I can take you to farms where I have killed many coyotes over the years where 100% of them come in from the downwind side. In fact, on those farms, you are wasting your time to call them from upwind. Other guys have different methods, possibly due to the prevailing wind in the areas they hunt. Never say never in coyote hunting, as you will get busted sometimes no matter how hard you try to avoid it. I set up where the coyotes are most apt to come in downwind of the ecaller, not downwind of me. I plan my approach to my calling spot with that in mind.