ORIGINAL: rasorbackq
Just do some testing I run mine about 3 feet up and 10 -12 feet from site.
Thats about the same setup I use. One thing to aid in better nighttime shots is hang the cam about 2' from the ground a little closer to the target, say 9-10 feet and aim it up ever so slightly. the IR seems to light up the lower half of the pics more than the top half. Aiming it up ever so slightly brightens the entire picture.