Radio basics and aerial principles do not change much, but the equipment and the frequencies are ever-changing, hence this comprehensive updating: * Up-to-date frequency listings * Latest digital technologies * Digital mobile radio * PCs (home, laptop, palm) with radio receivers * Shareware/freeware software for monitoring and decoding * 'radar-style' displays on palmtop computers This new edition reflects the fast-changing nature of radio communications and the new generation of equipment used to tune into all matter of two-way radio communications. It includes the latest generation of handheld scanners with 'automatic capture' facilities, which tune into (and then store the frequencies by memory) signals from nearby two-way radio users. Fully illustrated with photographs of the latest equipment and accessories, and tables of UK frequencies and call signs.