In situations where there is little cover, I go higher, as high as 30' at times. Not the ideal, but if you have a spot that is prime, you have to adjust. For me, the back cover is the absolute key. Also, if you have good cover on one side, but not to hot elsewhere, set your stand so that you are going to be using that cover to its full benefit. You may end up being off-center of where you would ideally be, but it serves no benefit to be sticking out and get busted, even though you can see/shoot easier.