In this book, several challenges facing the researchers and communication engineering students. As they are looking for software to meet their needs and requirement to perform analyzing for the radio wave propagation in a 3D view. This book consists of five chapters, the first chapter is introduction in this part I have talk for the significant and applications of Wireless InSite (WI) software. In second chapter, the designing of indoor case study would be performed with the required step to accomplish this part of designing. Then in third chapter, the preparing parameters for case study would be summarized in details and steps. Chapter four, highlighting the methodology for preparing study area and requested output. Finally chapter five, described the output calculated parameter how to handle and perform them, then a demonstration for the most important WI parameters would be withdrawn.