Wailer said:It looks like the siren has some kind of guard over the rotor/stator assembly to protect it from rain and snow. The guard faces backwards, so I'll assume that it would throw the sound backwards too.
That looks like an old Sireno R5R with the weatherguard, and I seem to recall that's the way hey did theirs, but I'm not sure how that affected the sound of the siren. Federal's WLRG, if I remember correctly, had the guard facing the front, but I may be wrong there.