I was thinking, (my wife says I'm "Does your head hurt?" when I say that) that when my coil is sweeping, it gets caught on sticks and stuff. In the soybean field it was getting caught on the bean stems that was left after they were cut. What if I cut a circle of Plexiglas and put it on the bottom of my coil? Do you think it inter fear with the signals? The bottom would be solid and wouldn't get caught on stuff and I could see thru to the ground.