Each of the designers listed here share a common structure and form, while presenting combinations of controls specific to the type of antenna covered.

In each case, the user is presented with a group of controls in the upper left portion of the page: these controls enable the user to completely specify the characteristics of the antenna, namely frequency, wire lengths, angles, and so on. Please note that all length dimensions are given, or calculated, in meters.

Example designer layout

In the upper right portion of the page is a graphics area where the modelled antenna is presented in a 3D context. The graphic can be zoomed, panned and rotated. Antenna feed-points are shown as colored markers; the user may also choose to toggle the appearance of a semi-transparent plane at the height (1.85 meters) of an average person, in order to gain some perspective on how large the antenna would be when erected.

In the lower half of each of the designers, a group of controls enable the calculation of an antenna's performance, and the presentation of charts and diagrams showing the performance in various ways, in any combination of the following:

• azimuth, elevation, 3D and polarization radiation charts
• VSWR charts, incorporating Real- and Imaginary-reactance curves
• an antenna currents diagram
• a Smith chart

Example antenna performance controls section

Calculation of an antenna's performance is achieved using a NEC4.2 (Numerical Electromagnetics Code v4.2) code-base licensed to the site.  Results of the calculations, and the resulting charts and diagrams, are entirely comparable with those presented by programs such as EZNec and 4nec2, for similar antennas.  Nonetheless, NO claims are made concerning the accuracy of such information or results; the graphics and data presented in this site are provided "as-is" for the general interest and edification of the user.  Refer to this site's Disclaimer for more information.