ORIGINAL: Swift Arrow
I would not go any higher then what would go beyond the limits of what my body is able to take from the fall. I do not go any higher the 20 feet. 18 feet is plenty of height that will not spook the deer.
Be safe.
Don't believe your body can absorb an 18' fall, because it might not. My Brother in Law fell 18' and broke his back,Terrible accident. I was the one who found him, and was there when he was Life Flighted out. If you don't believe in a safety harness that experience would have convinced you.
Dan