Ham Radio - 160 meter vertical antenna

In a small yard, you have limited options for setting up an antenna for the lower bands of HAM Radio. This article gives a good overview of a helical wound vertical antenna that can be used in a small space. Going to have to try this out. It's vaguely portable as well for field day or operating while camping!

http://www.hamuniverse.com/k6mm160metervertical.html