This paper describes a leakage detection system that measures received phase and magnitude of a stable continuous wave (CW) test signal versus distance. The received complex signal samples are used to mathematically construct a synthetic phased array (SPA), which points to (vectors) the leakage signal source. The latitude and longitude of a leak source are located where the vectors intersect. The use of a CW test signal with synthetic phased array provides superior receiver sensitivity. Having both signal strength and a detection distance determines if the leak is over Federal Communications Commission (FCC) limits. Practical test considerations and samples of field tests are provided.