The conservation of the spectrum is one of the key challenges facing radio systems professionals today. It will have an impact on equipment design, system design and communications policy for digital and analog systems in civil and military use, cell phones, private mobile radio, satellite communications and a growing number of other applications. This concise readable text keeps mathematics to a working minimum, with focus on the practical. It is a companion volume to Gosling's Radio Antennas and Propagation. Professor Gosling distils his experience in industry and teaching to show engineers how to deal with these challenges by describing the process of effective spectrum utilisation, including examination of separation of transmissions by space, time, frequency and sequency. Throughout the book reference is made to real-life examples to illustrate the theory.