Well if you know where they are coming into the field what I would do is work backwards from there, find the thickest stuff you can heading back into the woods and setup about 50 yards from there, on the downwind side. More than likely they are bedding in the thick stuff, if they are still feeding on the corn. Another possibilty is to follow the stream away from the corn until you near some real thick stuff and set up downwind of there.

The Tazman aka Martin Price
Founder and President of
Virginia Disabled Outdoorsmen Club