It should extend above the highest ridge line. I do not know codes for many states. but you may have one.
Would that be the edge of the roof line or is that the highest part of the peak of the roof? (so if it was to look like a upside down V, would it be the bottom of the V or the peak at the highest point?)
It would be the point on the inverted V.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them