90th edition, The ARRL Handbook for Radio Communications is a valued reference for radio electronics and wireless communications. Since 1926, it has kept radio amateurs, professionals, and experimenters immersed in applied theory and do-it-yourself projects. The ARRL Handbook covers a wealth of information: the fundamentals of electricity, electronics and radio signals, construction projects and practices, antennas and propagation, equipment, computer interfacing, circuit design and other useful reference information. Soft cover, nearly new condition. Includes searchable CD-ROM of entire text and supporting data files for Windows and Mac systems. Paid $72 Cdn.