I have several culvert (top and bottom are open) that coyote use for dens. I will sit 200 yards away on evenings in the winter, best weather for them to come out at sunset is when the wind will be calming down and temperature has risen during the day. Some of the walks in are 1/2 mile, so sitting for 1-2 hours I have to dress carefully. They will not come out to calling, tried coyote,Fox and prey sounds.