Setup in crosswind or wind facing you. If you use an e-call, set it up upwind and away from you. I usually set it up about 35 yards up wind and about 50 yards away from me. Decoy like a mojo works wonders to get view off you. If no e-call, but a partner is calling, set-up the same way but try to at least be able to see each other so you can tell when a dog is coming in. If calling by yourself, setup crosswind but facing the downwind side cause they'll circle to smell you. Or if you're 100% sure where they'll come from, setup facing wind. Set-up in good cover to break up your silhouette. Our man Les Johnson likes to sit in the open, and he has great success!
If no wind, try to setup where you think they MAY come out. This is tough, cause those buggers just might cover your 6 anyways. Try to setup with some sort of opening in front of you, at least 50-60 yards of clearing, any tighter set-up and you risk them seeing you before you see them.
I've also noticed that if you're strictly howling, they have a tendency to come straight towards the sound. And when you start on a distress call, they start to circle.
It's never the same twice!
Good luck!