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 services involve obtaining technical expertise, engineering data, and OEM parts from Chelton, Inc. (Cage Code 63563). The purchase is for three units of one antenna model and two units of another. All quotations must have shipping terms of F.O.B. Destination or F.O.B. Origin, as other terms will not be accepted.