In May of 2008 another radar system, an AR-1 was deployed at SEA, in this case the radar was equipped with an array antenna. The AR-1 system has been operating continuously since May 2008.  The roof radar installation consisted of two radar units (AR-2) equipped with dish antennas that were tilted to 4 degrees and 8 degrees. Following initial trials, the radar became fully operational in July 2007. That operational system included a Google Earth interface to observe radar target tracking in real time. 

The AR-2 radar operated continuously at SEA from July 2007 until April 2012, when the 8 degree AR-2 radar was converted to an AR-1 system at ground level to the North West of the original AR-2 location.  The 4 degree rooftop radar is still in operation as an AR-1.

The radars were instrumental in verifying the utility of storm water best management practices, showing that detention basin mitigation designs did not attract wildlife. In addition to the surveillance role these radars play at SEA , the radars have been used in validation studies. SEA personnel have coordinated a number of special studies such as the use of radio controlled helicopters, equipped with GIS units, as radar targets. The helicopter studies have been supplemented by fixed wing aircraft flying patterns typical of soaring birds, and in late 2009 a Robo Falcon, used in airport wildlife control, was used as part of ongoing validation studies. The Port of Seattle and SEA Wildlife Managers have been instrumental in supporting CEAT's efforts in reporting on radar deployment and the development of concepts of operations.