Coat Hanger HDTV Antenna!
via youtube.com
I posted this a couple year’s ago, but here it is again… The DIY HDTV antenna that pulls in the cleanest HD signal you can get… over the air! Cable companies squash down the HD signal to cram as many “HD” channels as they can into your wire. Over-the-air is the least compressed you can see. (Forget 1080 vs. 720, if the signal is compressed, its going to look crummy regardless of vertical line number.)
Set up an antenna like this and feed another input on your TV to pick up clean HD.