Josh, I think it's 100 yds (300ft) from the line. If so, that would give you a whopping 200x200 yd square (9 acres if I'm doing my math right) right in the center of your 40. I hope there isn't a large opening in the center of that 40 preventing you from "hiding" your feeder. This is most definitely not designed for the little guy. Skinny is all over what this proposal is about.