I found a description of this antenna many years ago, a couple
of days before our annual field day. So one for 6m was
made, using the dimensions shown in the picture below.
The antenna was made of 1.5 mm diameter enammelled copper wire, and the
upper and lower
horizontal elements was routed through two lengths of plastic
tubing, of the kind electricians use for feeding power cables
through a wall. A third tube was used for the feed section, with
the antenna element routed through two small holes in each end
of the tube. This arrangement made the antenna very stable also
when the wind increased.
The upper tube hanging from the top of a 6m long fishing rod,
and the lowest tube was guyed to the ground to avoid twisting.
The feed section was taped to the outside of the middle tube
section, and fed with RG-58 coaxial cable at the center.
They say that the phrase "Hen" means "strange" in Japanese, but
maybe they should rename the antenna to Funtenna, since it was
really fun to build and use. The antenna was used for portable
use, a couple of years, and was finally given away to an italian
radio amateur visiting Norway in a camper.
Last winter I found one of my old logbooks, where this antenna
was scetched on the back. So decided to obtain the needed
formulas, and make this calculator software. The original scetch
indicated the antenna dimensions for 50.1 MHz to be 1m wide and
3m high, which coincides well with the dimensions given by the
calculator below.
|