I picked up a
$24 antenna from Circuit City, it is awesome, I've got all the network stations in HD for free. My tv came with an internal HDTV tuner so you might have to pick an external one if your tv doesn't have it.
Just felt like posting this because I didn't even know about over the air HDTV until I got my new TV and read about it in the manual.
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It's cool see see the HD .2 channels though. ABC and NBC in my area use .2 as their all weather channels.