The coyotes should be active around the same times as the deer and other wildlife are active. I use Repel. Coyotes can smell it, but they can smell me just as good without it. Set your CD player up to play to coyotes downwind, then try moving downwind and to the side about 50 yards. Coyotes usually circle downwind to sniff things out before they come running on in. If you can set up a pretty good sized opening to your downwind side, you can see any coyotes coming that direction before they can wind you, and some will come in from a different direction because most are leary about wandering into a field or other wide open area.