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Looks at radio frequency design relating to the expanding field of data transmission with the arrival of purpose‐made modules, particularly at 418MHz. Describes the three main types of antennae to be considered at 418 MHz, the vertical whip, the tuned loop and the helical. Discusses the parameters that are applied to systems of speed, distance, battery constraints, size, location of equipment and limited frequency allocation. Uses the example of a low power battery operated alarm system required to provide security at a stables to show how various design problems can be overcome.