DIY Coat Hanger HDTV antenna

Get your local ABC, CBS, NBC, FOX, PBS channels for FREE!
With a Coat Hanger HDTV antenna

Since June 12, 2009, all over-the-air TV broadcasts are broadcasting in digital

Build time: 1-2 hr
Skill level: EASY
Cost: ~$10 (could be cheaper if you have materials on-hand)

Source/Reference: Popular Mechanics