If Project 28 is successful, hundreds of towers (an estimate in May 2007 was 850 towers) Sean Snyder, "Boeing, Department of Homeland Security Implement Project 28 Virtual Fence: SBINet’s Project 28 is underway and scheduled for completion in mid-June" , Design News, May 4, 2007 could be placed on the 6000 miles of the U.S. borders with Mexico and Canada.