Larue, is correct, in the day especially, give them the no ones home treatment after you have used vocals, if they are close they have to come and see who is in their territory... coyotes care about territory more than anything...Also I personally feel that eastern hunters do not stay on stand long enough, if I get coyotes vocalizing out in front of me, I will stay till I zap one.. if that takes three hours of working them, so be it.. I worked a coyote one time for hours as she vocalized threat barking me, I never ended up getting her, but I did end up with a monster female that came to see what all the fuss was about.
I use 90 percent coyote vocals and I have had coyotes do things that you guys would not believe, including being down wind from me barking and scolding me, only to have me end the show with a well placed shot.
There is a member on here that I took hunting, we called a coyote out of the bush, but we could not shoot it because it was on the crown of a hill. It ran back in the bush, I told him I would call it back out, and I did... That same member called a coyote out of the bush three times but could not get a shot..
My point is if you know they are there, and you have good cover and shooting lanes, don't assume they have busted you...keep calling, and if you do miss one, keep calling, if there is one coyote, more than likely there is two or more, and they don't have walky-talkies to communicate with each other..