doing my homework with the mathematics, I decided to use a different
dipole length for my multiband HF wire antenna... The experimental
antenna length that worked best
for me was 39 feet long on each leg, or 78 feet overall length,
that is 11.8 meters each leg or 23.7 meters
shows the 78- Feet Dipole Antenna.)
to make it fit into the available
space the last 6 feet of the antenna on each leg are placed at a 90 degrees angle ...
to increase the bandwidth of my 78 feet or 23.7 meters dipole fed with open wire line of 400
ohms, I used two wires
on each leg, that are spread apart from the
center insulator at a distance of 50 centimeters... The open wire transmission line is connected
to a junction box, where
I can select a 1 to 1 or a 4 to 1 balun
that is connected via coaxial
cable to the PI network antenna
73 and DX
Host of Dxers
Unlimited radio hobby program
Radio Havana Cuba
I.G.: Below you can see SWR (at 350- Ohm Terminal) for 78- Feet Dipole Antenna placed at 10 and
20- meters above real (simulated by MMANA) ground. As you can
see the 78- feet antenna really has at the amateur bands SWR/Impedance
that could be matched with ATU.
The antenna is real compromise between 88- 66- and 44-Feet Dipole Antennas.
Gain and Diagram Directivity of the antenna is not bad.
Files MMANA for the antennas you may download at