Coyotes rely on their nose as there most important sense. They're unpredictable and the eastern coyote tends to be very skittish and wary too. A lot of game use snowmobile trails as there travel corridors when the snow is deep. I have a Foxpro FX5 so I would set up with the caller upwind of where I'm gonna actually sit about 50-100 yds. depending on how thick the cover is.