Fixed WiMAX (IEEE 802.16d) is positioned as a wireless broadband alternative to the traditional cable and Digital Subscriber Line (DSL) technologies. Mobile WiMAX (IEEE 802.16e) has been chosen as the 3G/4G technology by major mobile/cellular service providers around the globe. Many Government organizations are also interested in the WiMAX technologies. We have built a WiMAX RF Planner, a WiMAX cell planning tool. The WiMAX RF Planner incorporates all the standard features of commercial RF planning tools with additional features tailored for government requirements including: support of base station mobility as well as interfacing to WiMAX radios, OPNET and Google Earth. In this paper, we present its features, the architectures and sample simulation scenarios.