Bloomington, Minnesota had a very interesting system back in the day. They had Thunderbolts, a Screamer or 2, Allertors, and 2 SD-10s. Majority of the sirens are replaced except one. A Thunderbolt 1003 located on an orange building in eastern Bloomington which was installed in October 1978. It was deactivated in 2019 but still up as of current day.
Owner of a Mini 5T and some other mini sirens. I use a SX540 for pictures & videos.
Feel free to save photos I take of sirens. If you want to use them in a video, please ask.
https://www.youtube.com/channel/UCncn7J ... qkOi3WKkIA