Antenna tracker mechanism from AT homepage?

Does anyone know what pan and tilt was used in this photo from the AT homepage?

Hi Rick,

I believe this was a DIY project for the 2014 UAV Outback Challenge

The 5.8 GHz antenna was automatically steerable and tracked the UAV throughout the flight. The steering mechanism used a few scavenged stepper motors and a Pixhawk (running the APM:Plane in antenna tracker mode). This was in turn connected (via a low power 433 MHz radio link) to a GCS laptop which provided a telemetry stream telling the antenna tracker what the UAV’s current position was.