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As with a good many simple questions, the answer in this case is, ‘it depends’.
It you are a cable user, and your cable company has HD service, you will get the cable box that will tune the cable HD channels as a part of their package (at least in most cases). However, many cable companies in many locations do not offer local stations HD channels even when they offer other HD channels (such as ESPN HD and HBOH). It this is the case in your area, you will need something to tune over-the-air (OTA), local HD stations. Most cable boxes won’t tune any OTA signals, so a set with an internal HD tuner would be helpful. Otherwise you will have to purchase an external, OTA tuner. But if your cable company offers all the local HD channels the cable companies box will take care of it all.
If you decide to use a satellite service you will need an external tuner regardless of what is included in your set. All of the DirecTV HD receivers will also tune OTA HD signals—and I think that this is true of Dish as well, but as I don’t subscribe, I’m not sure.
¡Time is not my master!
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