That indeed is an STL-10, along with a baby Darley beneath it. It is owned by the North Amityville (Long Island, NY) fire department and its eerie moan can be clearly heard for a distance of over four miles in every direction. The square horns are indeed replacements.
There's an STL-10 just like that in Warrenton, Virginia, on the roof of the fire company. It is now used for tornado warnings and tested every Saturday at noon.