And I'd just like to add that you don't even need to purchase an expensive powered antenna. There's plenty of websites out there that have nicely detailed instructions on how to make your own HDTV antenna with most of the parts available in many people's garages right now. The one I made outperformed both the rather expensive ones I had purchased. Not only do I get the four major networks, I also get a couple other channels that many people aren't even aware are broadcasting into the greater Wilmington area.
I would also like to add that if someone doesn't really want more than the basic networks they can also get very basic cable at prices the cable companies don't publicize too well. Time Warner has an $8 package that isn't too bad.
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