>>> That's why I said 10 years for HD.  And besides, digital channels take
>>> the same bandwidth spectrum as analog tv channels.
>>
>> IIRC, in the US at least, digital takes less spectrum.
>>
>
> I thought analog channels were 6MHz wide as well, but couldn't find any
> actual numbers after a 3.5 nanosecond wiki search.

In the UK single analogue TV channels (which were 8 MHz wide) were 
replaced with digital "multiplexes" of up to 40 MBit/s that occupied the 
same 8 MHz bandwidth. The frequencies used were the same for both 
systems which is why they had to wait until analog was turned off before 
the digital signals could be transmitted at full power (to avoid 
interference with adjacent transmitters).

Each digital multiplex can hold a variable combination of video, audio 
and data, but typically 10+ TV channels per multiplex. Also this allows 
some channels to have a higher bitrate than others.

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