I just recorded this today, and I tried to get a close as I could without distortion. I used hearing protection, and I was definitely within 100 feet; maybe 70ish? I had it set far back to get a bigger picture, so it doesnt look as close as I actually was. If you listen, you can hear the sound bounce off the houses, as well as another siren in the distance (possibly the Lockland T-bolt). I could definitely hear the blower firing up!
http://www.youtube.com/watch?v=ZTDejiSwmSI