Now some of you have asked in the past "how far away can you hear a siren?" Well here's your answer. This is Broad Brook (East Windsor CT) FD's 7.5 HP STH sounding for a call. There's not much to see as I don't have night vision, and the 60w bulb I got in my deck light is not bright enough (can't put anything brighter in that light per managment's rules).
Conditions were just right, cold, cloudy wind blowing around 5-10MPH from around the north/northwest (from the direction of the siren) no leaves on the trees. I'm certain I would of heard it in my bedroom. You'd never guess on how far it actually is. I missed the wind up thanks to another call in Ellington (one town over). I heard the "warble" in the background of that call, cought the dispatch, and stepped outside. There's also a bit of wind noise.
http://www.youtube.com/watch?v=ksFerfd-4is