SODAR is an abbreviation for Sonic Detection And Ranging. It emits sounds into the atmosphere to measure wind speed and direction at different altitudes up to 900 metres above the ground.
Once transmitted, a fraction of the sound bounces back into the equipment. The strength of this returned signal provides information about the turbulence and temperature of the atmosphere above.
Additionally, to the south, you can see the tall mast associated with this weather station.
Note: There is a similar site at Tidbinbilla. The cache is not hidden on any of the equipment.
Please BYO pen.