First stab was via the scooter in the DNC video that the #j6#bomber walks right next to. In 2021, there were only a few companies providing scooters and this one looks a lot like one of them that has a known height. I got 5'9"
Second stab was from a video the #fbi didn't post but #WaPo did in early reporting. Bomber walks close to a car of known height. I got 5'9" again
It's worth noting that as much as I don't like her, popular suspect #MTG is easily in the clear. She is 5'3".