Depends on the field and what's growing in it. One of the fields we hunt has been left fallow for a decade so it's pretty overgrown with grasses, trees, and open patches where wild onions and rice grow. We built a wood frame, covered it with a camp tarp and dropped it in the middle of a clump of bulrushes and grass on the edge of one of the clearings where ducks come in to feed. Dropped a couple milk crates to sit on and we're golden. Unless you knew where it was you can't even see it until you're 10 feet away.