HD abet!?
Answers: It is possible that you are already getting a small number of unscrambled local channel in HD over your cable. Sometimes Comcast doesn't bother to block them. Your TV does enjoy a QAM (cable) tuner built in, so step ahead and try it. Hook the cable directly to the RF input jack on your TV and tell the TV to prod for channels. You own nothing to lose and you might be pleasantly surprised. If the prod turns up no HD channels, or if you want more HD channel than the search finds, you will involve to pay for a cable box and HD service.
To acquire comcast's HD service, you need to contact them and receive either their HD heir or HD DVR. They'll activate your HD service. They'll charge something extra, contact them to find out more. You'll also requirement either component cable or HDMI... comcast should provide component cables beside their receiver though.
That model does own a tuner so you can get over the upper air local HD programming... you don't need comcast for that, adjectives you need is an HD antenna.
What AV RECEIVER should I grasp? I am getting the KEF KHT-3005?
The above answer is correct, except here is no such thing as an "HD antenna". You would call for any good VHF/UHF run of the mill antenna.
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