This is a restricted solicitation for one specific antenna, with a firm-fixed price purchase order anticipated to be awarded on a sole source basis to Chelton Limited. All items must have clear traceability to the Original Equipment Manufacturer (OEM), Chelton, Inc., and include a Certificate of Conformance. No drawings, specifications, or schematics are available from the USCG. The applicable NAICS code is 336413, with a small business size standard of 1,250 employees. Performance location and budget amounts are not specified.