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DR (or DAB) has been around for several decades but only now is it being adopted and implemented by the commercial broadcast community. There are four types of systems: Eureka 147, DRM, IBOC, and Satellite Digital Audio Radio. There are two types of implementation strategies: use of dedicated spectrum and reuse of existing spectrum for AM and FM broadcasting. Eureka 147 uses dedicated spectrum; DRM and IBOC reuse existing spectrum. In addition, SDAR makes use of terrestrial as well as satellite systems (XM and Sirius). Digital tuner costs vary from US$150.00 to US$1,000.00. Table 3 shows a comparison of each type of system. Although a principal purpose of DR is the enhancement of audio quality, this technology offers additional features such as the ability to integrate and broadcast text, data, and video, weather service information, and satellite maps of your location. In addition, DR technology is adopting the use of software to defined radio capabilities and features that will result in longer equipment life cycles and using common equipment in diverse applications.