I thought since there is a lowest sirens thread why not have a high mounted sirens thread.
Here is a whelen that looks to be pretty high up, as well as on a hill.
http://img.groundspeak.com/waymarking/8 ... acbf04.jpg
Thunderbolt in Downtown Topeka, KS ontop a 11 story building
http://www.dylan.helixweb.net/Files/sh1.jpg
Better Pic:
http://www.dylan.helixweb.net/Files/coolpic2.jpg