One of the greatest parts of Amateur Radio is making your own antennas, cable testers, and other accessories that you may need.  Here is a YouTube channel from Dave, KG0ZZ.  On this channel, he gives detailed instructions on how he has created several different things that he has used for Amateur radio.

YouTube Channel: http://www.youtube.com/user/zerozedzed?feature=g-u-u

Website: http://www.amateurradio.bz/

Enjoy!