The Department of Transportation, specifically the Federal Aviation Administration (FAA), is conducting a market survey to identify potential vendors for Commercial Off The Shelf (COTS) Tactical Air Navigation (TACAN) Antenna Systems. The FAA aims to replace obsolete antennas to ensure interoperability with existing TACAN ground transponder equipment, requiring electronically scanned antennas that can operate across the entire TACAN frequency band without modification. This procurement is critical for maintaining the functionality of the National Airspace System (NAS) and involves installation support across approximately 30-35 sites within 90 days of contract award. Interested vendors should submit their capability statements electronically by April 21, 2025, and can direct inquiries to Michael Jones at Michael.E.Jones01@faa.gov or Richard J. Simons at richard.j.simons@faa.gov.