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If your television set (or monitor) had an input that accepted RF-Modulated data of HD quality (ATSC (okay, I know that is ATSC is technically digital and not necessarily HD but let's not confuse it more)), and many newer HD sets do have built in ATSC tuners, the Dish receiver COULD send HD quality over a piece of RG-6 coax. However this would require another conversion / de-conversion of the digital stream and would only work on sets with built-in ATSC tuners. Instead they send the digital video and audio stream out the HDMI cable which has multiple connections instead of two - so RF-modulation is not required. This is a also a decidely cheaper approach than building an ATSC RF-Modulator into the reciever.

The signal that is sent to the DBS reciever from the LNBs on the dish is high frequency RF-Modulated data. It contains a LOT of information including overhead and authorization information, etc.

In the end it's not really the cable type that matters, it's how the signal is sent on that piece of cable.
 
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