I've been using an electronic caller to call in predators, moose, loons, turkeys and anything else that might be interested, for a couple of years now. I had a great morning at Palm Bluff, calling in a pair of Great Horned Owls and a Coyote.
The pair stayed above the call for about 10 minutes.
Coyote ran in, stopped 20 feet from me, I got one photo, it spun and raced off. Too close for a full body view with my DX sensor and 300mm.