The S810C and S820C Microwave Site Master™ models that provide an accurate and convenient method for installing, verifying, troubleshooting, and repairing microwave communication systems operating up to 20 GHz. The S810C, covering 3.3 - 10 GHz, and S820C, covering 3.3 - 20 GHz, give microwave site installers, point-to-point operators, point-to-multipoint operators, radio manufactures, cellular/PCS/3G operators, and more, excellent performance when analyzing microwave transmission line and antenna systems. The Site Masters have a return loss range of 0 to 54 dB with 0.01 dB resolution and 517 data point display resolution to locate long-range problems.