Did there used to be a Thunderbolt here? I noticed a bunch of sirens in Hawaii are mounted on things like that. It looks like you could put the blower to a Thunderbolt where the SD-10 is.
I don't know why, but it's a little rare to see a siren mounted on TOP of a pole. They all have those "thunderbolt blower" platforms that most SD-10s, STH/L-10s, 2T22s, and some RSH-10s are mounted on. This SD-10 switched places with the STL-10 that I recorded back in May