alternate version:The antenna falls vertically. The NW corner and SW fire do not fall.
The antenna tilts away from the viewer as the "top block" tilts down at the back of the buildung. The leverages involved mean that the antenna goes down more as the roof line near the viewer does, since the roof line is supported by the "hinge".
The advantage of my version is that the hat truss can remain intact, see my post #21.
Your version requires that the hat truss breaks, which you haven't explained.