I've been recently working on a map for locating all of the Modulators (and any older sirens that aren't MOD2008s) within The Netherlands:
https://www.google.com/maps/d/edit?mid= ... sp=sharing
The map is far from complete, as I've still got the North, South and East parts of Holland to locate their sirens. This honestly may take me months to find all 4,200 sirens.