http://www.youtube.com/watch?v=uZNVLZSACMc
Here's a video I took of an ACA Allertor 125 on S. 108th St in Greenfield, WI. It has a broken rotator, as you'll plainly see, and turns around randomly in the wind.
It also shot out a lot of water which seemed to have collected in the "donut" shape around the chopper. It was sort of neat to watch it spray out the projector on top, but distressing also, because it meant the chopper would have been partially submerged in water.
I was very happy to hear the Attack signal, which Milwaukee hasn't tested in nearly a year.
I called the Milwaukee County Sherriff's office of Emergency Management to report the broken rotator, so hopefully it gets fixed rather than taken down. I really love these sirens and don't want to see them all gone.