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The hybrid finite element and boundary integral method (FE-BI) for analyzing scattering from an active antenna is presented in this paper. First, the principle and formulas of FE-BI method are detailedly demonstrated, in which the contributions from the antenna feed and incident EM fields are simultaneously considered. Then as an example, the radar cross section (RCS) of a probe-fed plane bow-tie antenna is calculated by using this method. The numerical results show that the RCS of the antenna with the feed is obviously different from the same structure but without the feed.