I just got back from NH, with pictures of their sirens. I saw six different sirens in the area we drove in, and I am willing to bet there is more. they were all Whelens, and might have been for storm or nuclear plant warning. While in one part of town we went down a road to find a sign that read "No trespassing nuclear plant workers only". we turned right around after seeing that sign.
I was staying at a Hotel in Hampton beach. I also got a new knife for $15, a red butterfly with good joints, so it does not wobble.