Of the times that I have headed out for coyotes, more than naught we get skunked on the stands. I am thinking the cause of this came from the lack of patience of sitting at the stand. I took all of the comments about the 15-30 at the stands. Well I started adding 15 to 30 minutes more to get mister coyotes to come in. Whether I am hunting in coyote smart areas, or just areas that are fresh as one would hope for coyotes. Some times a little more time is the ticket to get the dog/dogs to come in.
Best of luck, if you don't seem to enjoy going after the coyotes send them on down this way. No hard feelings if you do.