Hi Dave,
In 1977 I was on Kangaroo Island and one of the locals pointed out to me (with a telescope) the site of a WW2 radar station near Cape Jervis, although I have not been able to find it since then. I note that the AWM describes the Max Rugless drawing as being at Cape Jervis. Were Yankalilla and Cape Jervis the same site?
Stan Woods

Yes Stan, there are several names that have been used to describe the area.