The following weblinks will take you to some online antenna calculators.
Frequency Wavelength Calculator
The distance between one point to another adjacent point in a wave is known as the wavelength. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. This calculator will help you to calculate the different wavelength of antennas based on the frequency.
CUBICAL QUAD ANTENNA CALCULATOR - 1
Here you will find information about wire antennas as well as directional beams.
This page is intended for users that want to experiment with a yagi design but do not need all the rhetoric contained on the main Yagi Design Page.
BASIC YAGI ANTENNA DESIGN FOR THE EXPERIMENTER
Helpful non-technical, no theory user information for
Yagi Antenna Design and How to Understand basic Yagi's
Condensed and re-edited from various sources
Gamma Match Construction
This is a great home site with good information on 11m antennas. I found it in a Google search I did on 'gamma match calculator'
This site is dedicated to bringing true information about the different types of antennas you can use, buy and build for Citizen Band Radio and 11 Meter DXing, from concept to construction. Then link opens on the Quad Calculator page. There is also a plan for a 4 element yagi on the site too.
Ham radio antennas, home made ham radio antenna projects kits and drawings.