A computer program suitable for electromagnetic interference analysis of co-site wireless stations is reported in this contribution. The program takes account of the location, Tx parameters, Rx parameters, and synthesized radiation patterns. An automatic selection procedure is utilized for analyzing all the possible interference bands between each Tx & Rx pair. Meanwhile, an ITU-based radio wave propagation model is established to assist the calculation of the safety margin of each Tx & Rx pair. Based on the synthesized radiation patterns, it is possible to optimize the deployment of co-site wireless stations through the diagram of interference distance.