This paper introduces a software simulator which can be used for anti-ARM systems. The proposed simulator is a valuable tool for investigating the optimum deployment of decoy antennas which are widely used for anti-ARM and calculating the electromagnetic field in ARM receivers. To verity the effect of decoy antennas, we analyze the field intensity and phase of the receivers. We conduct an analysis of ARM attack in case of using multiple decoy antennas and the proposed simulator can be used to decide the optimum positions of the decoys.