The paper addresses the application of microwave remote sensing to the measurement of the vibration response of a guyed mast. The investigated mast is about 104 m tall and formed by a triangular steel lattice structure, that is pinned at the bottom and supported by three levels of guys. The antenna and the cables were safely and quickly tested in few hours and the modal parameters of the mast and of some cables were successfully estimated from the radar data by applying different output-only identification techniques.