Vertical Bar Field Construction

[Madison]

(Can't you tell that I'm just gaga over this vertical bar? )

I cannot find a drawing that gives information about how high above the top of the horizontal bar -- at 10' -- the vertical bars extend. While it seems to be a trivial dimension, it's important for some of my design work.

(A written teaser, perhaps? Hmm.)

I'll edit or delete this topic if I find my answer before it's posted. Thanks.