This applies to me hunting the wide open spaces of Colorado:
When I sit down, before I call, I glass the surrounding area for a minute or 2, mainly looking for a coyote that is watching me from waaay out there. If I see one looking at me, I don't make a sound until he is out of sight for a few minutes, then I'll start calling.
I call (hand calls), for about 20-30 seconds, then watch the area for 2-5 minutes. Repeat. I'll typically stay on stand for 15+ minutes, with 20+ minutes in Jan/Feb/March.
Before I stand up to leave, I glass again. Many times I see a coyote at 1,000+yds, on the way in to the call, and had I stood up, they would have spotted me.
Good luck.
