Free: Contests & Raffles.
Just hope you dont show up to a buck with his head stuck in your box starving cause his antlers wont pop off. I have thought about making one but I cant get over the fact that I might cause harm to a deer by accidentally getting one tangled up big time. Not bashing you just curious how you prevent it.
Pile up a ton of branches at the base of a big tree, throw hay into the pile of branches. Fences work well for jarring loose antlers if they have to jump over it to get to where they want to go.