This was made by US Air Force personnel from Woomera Air Station, only a few miles away.
It was a satellite downlink station, and would have been observing the Earth in the first place. I was stationed there 1982-84.
Years later, people I know told me about it. A big joke at the time.
Just checked it out... Looks like a one bar town, or did you fly out somewhere else for liberty? lol