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A Ultra-Wide Bandwidth (UWB) microstrip slot antenna (MPA) design reported earlier by our research group was adopted in the investigation of malignant breast tumor detection. Scattered field results were generated by full wave analysis for compressed breast model with two antennas and six antennas. As an improvement towards the subtracted scattered field results, averaging of the signal returns at each of the antennas was performed and hence their results are also proposed here. Two antennas based breast model with and without tumor was realized and measured, the results of which are presented.