Located in North Billerica, MA, approximately 25 miles northwest of Boston, SI2 was founded in 2003 as a high-technology electronics company dedicated to the design and manufacture of electromagnetic systems for military and government platforms constrained for space, weight and power. Specifically, SI2’s design and manufacturing efforts focus on antennas, arrays and signal management products for military air, land, sea and space applications. In September 2022, SI2 became a wholly owned subsidiary of Antenna Research Associates, Inc. and is now known as SI2 Technologies, an ARA company.