Your best chance would be to take a look at the satellite pictures of the land you hunt (via google earth or google maps) and look for some natural funnels/food sources. In the big woods of northern MN a big draw is fresh logging/clearcuts. Any of those around? What about rivers/streams? They can provide you with the funnels you are looking for. It's a LOT tougher hunting up there vs. agricultural land since they can basically go anywhere and have cover, but you'll find them if you put in the time.