I actually looked it up before I saw your post. Found a good article, basically, impossible to tell based on the TV angle, so we've got to trust the ref's judgment*. Very good points made in the article though that it's stupid for us to have to trust the refs judgment at this point in time. Higher goal-posts with a loose net directly attached, or something else creative, should take the ref's judgment out of the equation.
I couldn't see the ref under the upright, so I don't know what he signaled.
On Boise State's controversial missed field goal - CBSSports.com
