[mythtv-users] HD3000 and High-Def

[A JM]

I'm looking for some background on HD since I currently only run in SD. 
 Can someone give me the lay of the land as far as being able to recieve HD 
and watch HD? I "assume", bad word on my behalf, that by owning an HD card 
(HD2000- HD3000) that the "decoding" portion of the signal is complete all 
that is left is the actual signal? 
 We currenly have cable but do not use a cable box so we only get channels 
below 70, I think it's with Insight Cable. Do you need a box or other 
hardware to recieve the signal or just plug and play?
 Thanks for any insight the group can give.
 AJM,
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