I know of a couple of repeater sites up here on the Inyo where I know they are there since I've climbed both peaks. I've also used these repeaters for the 18 years of my career in the eastern Sierra. I could not find any indication of a repeater's presence on Google Earth. The vaults at these sites are tiny, perhaps 2' x 2' or 3' x 3' and 2 1/2 to 3 feet high. Both are painted a very light green color, which may not allow enough contrast to be seen on Google Earth. In these two sites that is as it should be as both a prominent peaks in very scenic areas. The two peaks I speak of are Mt. Warren and Olancha Peak. Heck, Olancha Peak has an Inyo and Sequoia repeater up there, but you have to be nearly on top of them on foot to find them. The antennas are also stealthy.
EDIT: The antennas on Olancha Peak don't have any type of a tower device, their mounts are drilled into rocks. Good old lag bolts and shields. The antenna at Warren is mounted to the little vault up there.