The new edition of this outstanding book is based on a popular IEE Vacation School has been fully updated to reflect the latest developments in the field. With the growing need for wider bandwidths and the consequent need for frequency reuse, this second edition includes greater emphasis on the needs of digital technologies and to new kinds of radio systems. The content reflects the wide experience of an exceptional group of authors and the emphasis throughout is on the ITU Radiocommunication sector recommendations.