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If you need an easy to build, inexpensive gain antenna for the 20 meter band, then this basic Delta Loop Antenna may be what you need. Denis (VE3BF) has done an excellent job of presenting this antenna, which can be used at your home station as well as for the annual ARRL Field Day exercise. If you use balanced feed line, a 4:1 current balun, and a sturdy antenna transmatch (i.e. "tuner"), this basic design can be used on any amateur radio band between 20 and 10 meters.
I've built several delta loop antennas in the past and find them quiet and fairly stealthy in crowded urban neighborhoods.
If you follow Denis's suggestions, you'll have an effective 20 meter antenna with little effort and financial expense.
For the latest Amateur/Ham Radio news and information, please visit these websites:
http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon).
Thanks for joining us today.
Aloha es 73 de Russ (KH6JRM).