Engineered for demanding airborne applications such as data links and transponders on aircraft, helicopters, and UAVs, this rugged and ultra-lightweight antenna is meticulously designed to withstand extreme vibration and shock in harsh environments. Operating across a tunable frequency range of 350 to 475 MHz, it delivers a nominal gain of 0 dBi with linear polarisation and reliable omni-directional coverage. Featuring a 50-ohm input impedance and an SMA-Female RF connector, the system supports a maximum power rating of 20 W CW, ensuring continuous, high-performance communication under the most rigorous operational conditions.