This is a solicitation for a firm-fixed price purchase order to be awarded on a sole source basis to Chelton Limited for the repair of specific antenna parts. The required items are four units of antenna NSN 5985-01-582-3944 and two units of antenna NSN 5985-99-549-9067. Sources must have the expertise and ability to obtain OEM parts and technical data from Chelton, Inc. to perform the repairs. The contractor must provide a Certificate of Conformance. Only quotations with F.O.B. Destination or F.O.B. Origin shipping terms will be accepted.