NOTE: Most of this is speculation and guesses so if anything I say is wrong please correct me
So first of, this is the siren we are talking about
This one being located on the Regiment Memorial building in Sydney, AU. I am unsure if it is still standing because it is quite hard to tell with google
(also according to the site this image was from, the sound of this could travel 8 miles)
https://www.youtube.com/watch?v=XoHC3hyFqVU
This video is of the rotational model (shown above) located in Yogyakarta, Indonesia now I'm not sure if all of them spin as fast as this one but it is quite fast, also this is most likely 5 port or 10 port, and as of 2019 it is still in place!
https://www.youtube.com/watch?v=g5UEdYK24X4
This next video is of a omnidirectional model, this is also located in Yogyakarta at Plengkung Gading there are many pictures of this place that include this siren,

https://www.youtube.com/watch?v=s-HkMTwiea0
https://www.youtube.com/watch?v=Jo8C1tYluhU
These 2 videos give some extra information on these units (The first one showing pics of the omni model and 2 other rotational models, one is from a movie in 1951 the other is a photo somewhere)
Also these are used as fasting signals and a siren to set off to show Indonesia's independence
So that is all the information I have found so far, I will update if I find anything else out