The primary goal of this book is to present the salient aspects of antenna principles and technology and relate these to wireless communications applications. It is written from a unique perspective, containing a mix of topics - theory, design and applications of outdoor and indoor antennas adopted in modern wireless communication systems. The authors cover the descriptions of these antennas along with the underlying principles and present the associated design perspectives based on relevant electromagnetic theory and radiation mechanisms. The scope of the book includes industry-oriented research, design and development aspects of wireless antennas. It is also suitable as a course text for students at post- and undergraduate levels.