I had some time to kill before the Braves Vs. Phillies game at Turner Field yesterday, and since I was across I-85 from the Courts building Thunderbolt, I took a quick video of it.
Link:
http://www.youtube.com/watch?v=dFrj0BITalI
Google maps 45? view of the Siren (You can see the horn and the rotator assembly)
https://maps.google.com/maps?q=75+Sprin ... eg=90&z=20