get in there without being noticed and sit tight. You'll be way better off than drawing attention to yourself. Learned that the hard way.

Only call in large area's, really large where the calling isn't pin pointed, even then you have to be as keen eyed as an eagle. Just when you get tired and let down your watching or lose patience and call again, your pegged.

Patience is a virtue. Take your best shot, learn the area, adjust if need be and the years to come will be good.