The picture above is a diagram of the old standby CLASSIC antennas....the horizontal Dipole and the Inverted Vee. They are shown 'together" in the drawing for ease of viewing on this page.
Additional notes of interest:
The horizontal dipole and inverted V are shown superimposed on each other in the drawing and without the feed line for clarity. It is assumed that you understand that we are talking about 2 separate antennas in the drawing and not one antenna with 2 bands fed with coax.
Feed line (usually 50 ohms) is connected at feedpoints, center conductor to one side, the shield to the other side of antenna. The blue line in the drawing is the example of a horizontal dipole. The copper colored line is the inverted vee configuration. The inverted vee is is just a lazy dipole that can't hold it's arms up and is about 4 to 5% shorter in its total length. Both antennas can be constructed just about anywhere using any type of wire you may have and can be used with 50-75 ohm coax or open wire ladder line and a tuner. When fed with open wire type feed, it becomes a multiband antenna using a tuner. The use of an rf choke is recommended when using coax feed!
The inverted V antenna more closely matchs the 50 ohm coax than does the standard horizontal dipole, so your swr may be lower compared to a horizontal dipole fed with the same 50 ohm coax.
You could use the calculator to build a 75 or 80 meter dipole and then calculate an inverted vee for other bands higher in frequency, suspended under it as shown in the drawing above, from the same support and feed both with the same line to xmtr. This is usually called a "fan" dipole and works well when tuned for lowest SWR.
A little experimentation may be required for adjustment of the SWR, tuning the 75 meter dipole first for lowest SWR and then the inverted Vee/s under it in a test, cut, test, cut fashion.
Download the Ground Plane/Dipole/Inverted V Calculator by N2IMF
Courtesy of and designed by
Joseph R Mielko
This downloadable calculator will provide you with good starting measurements for a basic ground plane, Inverted V or standard Dipole antenna.
The graphics below are "screen shots" taken from it. Non functioning!
Basic Ground Plane Calculator screen shot.
Dipole and Inverted V screen shot of calculator.
This is a very simple program to use and has a handy "Print" function and nice graphics showing the basic layout of each antenna.
All you have to do is run the program and input your design frequency in the white window top left. Click "Calculate" and the length results are shown in your choice of feet or inches.
You may be surprised at how fast it works!
Download the zip file here and unzip it to a folder of your choice and name on your computer.
It is not a large file and should download quickly for dialup users.
After the file unzips, open up the folder and look for the "N2IMF antenna.exe file...double click it and the program comes up! Enjoy!
Again, this calculator is courtesy of N2IMF...Thanks Joe!
Here is another fine Dipole and Ground Plane Calculator
Submitted by KD0MDI, Mike
It is similar to the above calculator but with some refinements that are very handy!
Screen shot, non functioning! Shows a 2 Meter ground plane designed for 146Mhz
Screen shot, non functioning
Same calculator setup for calculating a dipole for 7.250Mhz
Download the zip file for it here.
Courtesy of Mike, KD0MDI