The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure five units of a flight-critical antenna, identified by NSN 0R-5985-016984608-RQ, for repair or modification. The procurement is intended to address significant design instability and performance issues, necessitating government source approval prior to contract award, as the item is critical for operational use. Interested vendors must provide detailed technical data and evidence of prior experience with similar items, as the government intends to negotiate with only one approved source under FAR 6.302-1. Interested parties should contact Carmelena C. Oldroyd at (215) 697-2606 or via email at Carmelena.Oldroyd@navy.mil for further information, with proposals due within 45 days of this notice.