A digibox changes a digital signal to an analogue signal.Why is one neede to receive digital TV at present?

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A digibox changes a digital signal to an analogue signal.Why is one neede to receive digital TV at present?
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A digibox changes a digital signal to an analogue signal.Why is one neede to receive digital TV at present?
A digibox changes a digital signal to an analogue signal.
Why is one neede to receive digital TV at present?

A digibox changes a digital signal to an analogue signal.Why is one neede to receive digital TV at present?
i have to say that because of the divergent of frequency of different signals,one 'needle' is enough for such function.