If you have an HDTV-ready set (sometimes called an HDTV monitor), you'll need to pick up an HD receiver to go with your antenna to be able to view HD content over the air.
If you have a true HDTV television (with tuner), all you'll need is the antenna.
-Terry
HAVE HEARD SEVERAL PEOPLE SAY THEY CAN PICK UP HD WITH A RABBIT EAR ANTENNA. WHERE DOES ONE HOOK IT UP TO? DOES IT TAKE GO INTO THE CABLE SLOT OR SOMEWHERE ELSE? I JUST GOT A 42" SCEPTRE LCD AND JUST WANTED TO
TRY THE ANTENNA AND DON'T KNOW WHERE TO PUT IT.WOULD THE ANTENNA TAKE THE PLACE OF THE CABLE SLOT ON THE SET? I REALLY KNOW NOTHING ABOUT THIS AND AM TRYING TO LEARN.
THANKS, MARILYN55

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic