wvyotehunter,
I believe that howling works best in first couple of hours of daylight and also last hour or so in evening. They will come all day long, but I am usually taking a lunch break and maybe a nap during mid day. /ubbthreads/images/graemlins/smile.gif
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Pbeets,
When you have a coyote howl back at your efforts and then he goes shutmouthed, it often means he is on the way in. Try waiting in silence for a few minutes, and if he don't show up, hit him with pup squeals. In heavy cover it is also easy for them to circle downwind, catch your scent and leave without your knowing it.