Spitoon:
The US, although not adhering to the ICAO AIP structure, includes a graphical portrayal of the location of radar head sites at AIM, Section 5, fig 4-5-5.
Those are terminal (approach control) radar sites. They are publicly available unlike en route radar sites.
It seems they suddenly became fearful that terrorists would find en route radar sites and blow them up, or something.
OTHO, most airport radar sites are on airport in secure areas.