Yeah, those Cunningham whistles just really beat any other diaphragm horn to me. I still like the Diaphone recording in New Hyde Park LINY, with the STH10 in the background. This one almost sounds like a diaphragm horn.
http://longislandfirealarm.com/NHP-Box2-2-1.wma
Or the Diaphone sounds on the Nassau county page on LIFA. Very spooky. 8)
http://longislandfirealarm.com/nassau.htm