Broadcast TV is typically disseminated via radio transmissions on designated channels in the 54-890 megahertz frequency band[1]. Signals are now often transmitted with stereo and/or surround sound in many countries. Until the 2000s broadcast TV programs were generally recorded and transmitted as an analog signal, but in recent years public and commercial broadcasters have been progressively introducing digital television broadcasting technology. http://www.intecbrackets.co.uk/