Do ya want to rethink that? Seriously, re-read it? You can't have the wind in your face and shoot them before they smell you, because if the wind is your face, they are behind you smelling you and leaving without you even knowing it!
If you want the coyote to come to you in thick cover, and if you think you can first see it, and then get a clean shot at it, in thick cover, then by all means, call with the wind blowing your scent into the thick cover. If it is fact that they won't come into an open field during day light hours, then why not set up with the wind blowing your scent into the open field any ways? Then they won't smell you at all!

The area I do most of my calling has very few trees. BUT, they still try to use the available cover. We set up so as that if a coyote wants to get downwind and smell us, he has to go into the open to do so! In other words, they have a choice, to come to us and stay in cover and not have a chance in smelling us, or go to the downwind of us, but expose themselves in the open. It seems the older coyotes like to hear, and smell something, where as the pups tend to come the shortest route, expecially if it helps keep it in the cover! Many times, no matter the age of the coyote, they will use all available cover, until they get with in 50 yards or so, then they make the move to get downwind! BUT if your calling thick heavy cover, can you see a coyote 50 yards away. They have better smell ability then do deer, and I've seen them catch our scent from about 200 yards away!
I've heard that those eastern coyotes are harder to call.