Look on google map. It is very obviously a perfect (as perfect can be) circle. Fenced with the TV brown fencing. One doesn't notice this from the ground. No power lines. And anyway, power towers result in a long narrow pathway. Not a circle of this size. I first thought a wildlife preserve for tortoises; mounds with holes with marker sticks throughout the field. But that doesn't explain the circle. Not ancient aliens, either. I have looked at virtually all of TV, and cannot recall another preserve/field shaped like this. There are fenced horse training areas that have specific shapes, but this isn't one of those. Copy paste:
Google Maps