Twice...Once from about 15' while stepping onto an icy hanging stand. I did manage to slow my fall by thudding off a branch and landed on my hands and knees in leaves. Just bruised and sore.

Second time was only about 8'. I was building a permanent stand with steps lagged into the tree. I nailed the steps first, then lagged them. I "thought" I had lagged them all and began to climb. Apparently I missed one, because when I grabbed it, I plummetted to the ground landing flat on my back. Wind knocked out.

I've not entered a stand since 1990 without a belt/harness attached to my body. These mishaps were back when bowhunting wasn't as popular and neither were safety devices. I was lucky.