There can be alot of variables when hunting field edges. This article goes over some of them:

http://www.buckhuntersblog.com/tacti...and-food-plots

Todd and Walt may have some more input but this article goes over different situations fairly well. I would watch where the majority of them come out and then set up inside the field edge and not right on it. I usually set up so i can see into the field but I am far enough back to be in cover. Bucks tend to hang back and scan fields before coming into them. Then play the wind and you should have a good chance.

Stan