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The IEEE 802.15.6 is a standard for the Wireless Body Area Network (WBAN), which is covering on-body and in-body communications. The Ultra Wideband (UWB) technology is a one of the possible technology to utilise for the WBAN. In this paper, we will present a monopole UWB antenna having large bandwidth for on-body communication in wireless body area network. The body tissue layers for the simulation model are chosen such that the antenna is meant to be work on the chest area of human body. Based on simulations, corresponding prototype was fabricated and measured. The simulation and measurement results of the S11, Voltage Standing Wave Ratio (VSWR) and maximum gain of the antenna and radiation patterns of the prototype are presented.