dh wrote:Just a thought, maybe a few lbs of deer meat will keep your neighbors quiet about those gun shots they heard in the middle of the night.

Good one! Is there a deer hunting season in your area, slow?
I'm told that deer won't jump a fence if they don't know if they can clear it and land safely. Some people have been experimenting with double fences with some success, the second, inside fence being made of simple white PVC pipe and white strapping tape, placed about 3 feet from the outside fence. But, your corn field is probably too big, making the cost too much to justify that.
Another thing that works is garlic. Deer hate the smell. You might try peeling and hanging a lot of garlic cloves around the edges of a small area to see if it works. Scatter it on the ground, too. It wouldn't cost a lot to try but it is time consuming, peeling and hanging it all.