Good advice from Hellgate. I hunt the Bald Eagle state forest in PA a lot for coyotes, as well as some local farms, usually at night. Try using a decoy. There are several motorized rabbit looking things, or you can just tie a squirrel tail to a fur covered stick. Something that gets their attention, and keeps it off you. Try placing your call speaker farther away from you. Full camo, and some kind of blind or cover helps a lot. Coyotes are just as sharp as turkeys at spotting you, maybe even more so. They will often circle before coming in, so pay attention to the wind. Depending on where you hunt, they can be very call shy. I usually just stick to the dieing rabbit call, as they are always hungry. Usually if I have no action in about 1/2 hour, I move to another location, as if there is a dog in the area, he has either spotted you by then, or came in for dinner.
Larry