In September of , I was tired of climbing poles and trees to move, remove, add, or change my single-band HF antenna's. I had tried long-wires, doublets, dipoles, and Zepps, but again, operation was restricted to single band operation, maybe two bands at most. The trick of it all, was to remember and change the plug-in "tank-coil" to match the antenna band. My ole rig was a home-brew, that I had built on an Atwater-Kent chassi, and I had wound the tank-coils on phenolic, plug-in coil forms No, it was NOT a pi-section, tank-circuit, it was link coupled, no less. I had heard of the "Windom" and read a few articles about the Windom, but most of my thoughts were
The Original WINDOM Antenna, with complete construction details!
Think of the "Carolina" windom antenna the modern version of the windom as an "upside down vertical antenna", hanging down from its counterpoise strung more or less horizontally some 10 meters or more above ground. In other words, the 22 feet vertical component of the "Carolina" - between the matching voltage transformer and the current choke balun - is a vertical antenna, fed at the tip. This vertical does not require a ground or a system of radials! Because the antenna is not fed at its center, the RF currents in each horizontal radiating section are very much unequal. This makes the vertical coaxial feedline radiate RF energy.
Here is my home HF antenna. It is an off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher.
After all, it was the starting point for my experiment in adding more bands to this multi-band antenna. When the original Windom antenna was developed around , the idea was to take a half wavelength of wire, and feed it at a point along the wire that would have [near] equal impedance on all amateur bands at the time i. From antenna basics, we know that a standard dipole has an impedance of about 70 Ohms when it is about a half wavelength above normal ground. As we lower it, the impedance drops. The same thing happens with the Windom.