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Wearable microwave diagnostic systems could transform the medical industry and provide an effective and continuous patient monitoring system in the future. In order to take the step in making this wearable system a reality, a novel compact flexible antenna made from flexible textile materials is presented in this paper. The sensing antenna is fed with a microstrip transmission line incorporating a stepped monopole structure. Three patches of different sizes are excited to obtain a wideband performance. The conductive part and the substrate of the antenna is made from a flexible conductive textile and a 6 mm thick felt material respectively. The antenna operates from 1 GHz to 4.2 GHz when in direct contact with an artificial head phantom. The antenna provide directional radiation patterns with a simulated 6 dB front-toback ratio at the center frequency of 2.5 GHz. The simulated and measured results show that the antenna sensor is suitable for wearable microwave head diagnostic systems.