It's possible ... if Wikipedia is accurate:

Wikipedia - High-definition television in the United States:

On July 23, 1996, WRAL-TV (the CBS affiliate in Raleigh, North Carolina) became the first television station in the United States to broadcast a digital television signal.
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HDTV sets became available in the U.S. in 1998 and broadcasts began around November 1998.
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Satellite television companies in the United States, such as Dish Network and DirecTV, started to carry HD programming in 2002.
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Cable television companies started carrying HDTV in 2003.

So, start searching people! :D