The fifth edition features new and updated material. Highlights include......a thoroughly revised discussion of receiving antennas. You ll discover how to greatly enhance their operational bandwidth. In addition, low-signal transformers for Beverages and other receive-only antennas are analyzed in great detail, along with effective common-mode filters....a new examination of phased arrays, with new concepts such as the hybrid-fed 4-square array and opposite-voltage feed system. This is a must-read for every serious antenna builder!...dozens of new propagation maps based on DX Atlas, as well as an in-depth analysis of the influence of sunspot cycles on 160-meter ducting....a new discussion of cutting edge technology including Software Defined Radio and the revolutionary LP-500 Digital Station Monitor. - from Amzon