Let's say I land headfirst on concrete. It's the only choice I got guys.
I'm sorry you're contemplating such things,
@CTBus. I'm not a jumper but from what I've read here 100 meters (~250 feet) is closer to sufficient. Apparently there's no way to ensure a head landing, and you might well end up alive but with bad permanent damage.
Please have a(nother) look through the Resource Compilation near the top of the forum. There may be options that you haven't considered.
https://sanctioned-suicide.net/threads/resource-compilation.3/