Presolicitation notice from the Department of Defense, Department of the Navy, for the procurement of an antenna. The antenna is used for communication purposes and is essential for flight critical operations. The item requires government source approval prior to contract award due to its criticality and the need for technical data. Only previously approved sources have been solicited. Interested parties must submit the necessary information for source approval. The proposed contract action is for supplies or services for which the government intends to negotiate with only one source. All responsible sources may express their interest and capability to respond to the requirement. This notice is not a request for competitive proposals. The government may consider all proposals received within 45 days. The procurement may be subject to Free Trade Agreements and the Buy American Act.