This SRN is located at the St. Helen of the Blessed Shroud Orphanage in Calumet City Illinois.
Just kidding, it's located in a parking lot near River Oaks Drive and Wentworth Avenue. You got us into this parking lot pal, now you get us out!
Sirens in Calumet City are tested every Tuesday at 10:30 AM, unless one is stolen for the bluesmobile...
https://www.youtube.com/watch?v=EX-f3xJ4ySQ