This has been debated alot in other forums but I never know who is right? All I do know is that I do about 80% of my pratice off the barn roof, It is flat/shed style roof that is 21 feet up, two feet shorter then my ladder stand. My CB is sighted in at from up there since that elavation is where I will do the majority of my hunting. Now my 20 yard crosshair is dead on atthe 21 feet,but when I get down and shoot on the ground I shoot about two inches low. Which agrees with some guys that say when you go up you have to aim low because you shoot high if your bow is sighted in on the ground, mine is sighted in on the 21 foot mark so when on the ground I have to aim high. Hope this helps, And don you need to stop that stuff, you and the new guy are guying to make us slow people go insane!