The College of William and Mary performed a field test of the Sonic Nets technology at an airfield on the nearby Fort Eustis Army base. Students surveyed bird activity at three places at the airfield four times a week for eight weeks to create a baseline of bird activity. Then an amplifier and speaker were installed at one of the locations to broadcast the Sonic Net sound and bird activity was again surveyed. An approximate 85 percent reduction in bird presence was observed - much greater than the 46 percent observed in the aviary trial. The investigator suggested that the higher success rate at the airfield is probably due to the difference between wariness of wild birds versus captive starlings.