Sirens Curse Nerdy Question

So, why this came up I have no clue, but, Sirens Curse is listed as being 160 feet tall. Is that to the middle of the tilt, the front of the tilt, or the very back when tilted? If it is to the middle, can you claim a higher hill if you sit in the back?

Back to regularly scheduled programming.... :-)

From what I understand, 160 feet is the "max" height, so that would seem to imply from the back row.