Led by GomSpace in Denmark, GomX-3 is a 3-unit CubeSat mission to demonstrate aircraft ADS-B signal reception and geostationary telecommunication satellite spot beam signal quality using an L-band reconfigurable software-defined radio receiver. A miniaturised high data rate X-band transmitter developed by Syrlinks and funded by France’s CNES space agency is being flown as a third-party payload. The satellite was deployed from the International Space Station on 5 October 2015. The distinctive helical antenna seen here has subsequently enabled GomX-3 to perform millions of detections of aircraft in flight.