The Department of Defense, specifically the U.S. Army Command, Control, Communications, Computer, Cyber, Intelligence, Surveillance, and Reconnaissance (C5ISR) Center, is seeking industry input through a Request for Information (RFI) for Software Defined Antenna (SDA) technologies. The primary objective is to identify solutions that enable tactical radios to transmit flexibly across the Electromagnetic Spectrum (EMS) to mitigate issues of congestion and contention, particularly in tactical vehicles that currently rely on omnidirectional antennas, which pose high physical and electromagnetic signatures. The Army is looking for multi-band SDAs with advanced frequency sensing capabilities that can automatically adjust legacy radio frequencies, supporting a wide frequency range (700 MHz - 6 GHz Threshold, 30 MHz - 6 GHz Objective) and various radio types and waveforms. Interested parties are invited to submit whitepapers detailing their proposed solutions, including performance metrics and Technology Readiness Levels (TRL), by September 2, 2025. For further inquiries, contact the Technical POC at usarmy.apg.devcom-c5isr.mbx.esi-bus-ops-acq-baa@army.mil.