I've been meaning to post this, but next to the FD building in Frankston, there's a double pole mount with a windsock on it. It's been years since I could've possibly seen whatever system they had before their Sentries, and then, I was too young to know what siren was there. Here's a streetview link.
https://www.google.com/maps/@32.0495688 ... 312!8i6656