The basic principle of broadband monopole antenna is discussed. A UHF sensor used for the spatial location of the partial discharge in substation is designed. With an elliptic monopole patch, the sensor can effectively meet the omni-directional detection requirements because of its advantages of omni-direction, broadband, high sensitivity, low standing wave ratio and stable group delay. The UHF sensor array consisting of multiple sensors is able to undertake spatial location of partial discharge. The spatial detection and location performance of the sensor are verified at the partial discharge experimental platform in a lab, and the sensor array consisting of such sensors is used for continuous monitoring of partial discharge in the substation field. Laboratory experiment and field application results show that the sensor is able to satisfy requirements in spatial location of partial discharge in substation.