We stumbled across this place in the early 1980's. Although we were parked on a public road adjacent to a recreation area, security pounced on us and sent us on our way. The place was not marked at all. We named it Yoyodyne after the fictional top secret facility in Buckaroo Banzai.
Years later I learned it was a facility for communicating with ships at sea. As the years have passed, many more dishes have been added.
en.wikipedia.org/wiki/Yoyodyne
en.wikipedia.org/wiki/COMSAT