HD gives a much clearer picture than SD. However, for what it's worth, I talked to a DirecTV Sales/Installer and he advised me not to go to HD in our situation of full time traveling. He said it's not worth the money to go to all HD equipment which includes the proper antenna. He also said that unless you have a "huge" HD TV (48" and up), you won't notice much difference in picture at all.
For my money, I think I'll go with DirecTV suggestion.
Orv
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