I stood in my boat and roughly measured from the gunwale to just above my head, so I could stand straight underneath like MadPerry mentioned.
And whatever you choose, if it comes with nylon strap tie downs, they recommend to put them at 45 degree angles... Get close to 45 on the front, but go vertical on the back for more fishing room. I did that on my boat with no problem. Good luck with your choice.
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