There are two basic reasons for the change to the digital format. First the digital format allow many improvements to be added as time goes on. If you remember the 2nd version of Back to the Future, they had tv screens that would have multi-media displays, you could watch tv, view your computer send and receive messages on screen. The uses for digital are endless
At the same time when the conversion takes place. all the old analog transmitters will be shut off. Then according to the FCC, those frequencies will be sold for use as communication frequencies, use for cell phones data tranmission and misc.
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