01- 2016, # 020
Simple HF Antenna for the 20-, 17-, 15-, 12- and 10-
Below described a very simple HF Antenna for the
20-, 17-, 15-, 12- and 10- meter Band. Antenna is fed by 50- Ohm
coaxial cable. Antenna has very simple design and does not require
any tuning if it made according the drawing.Figure
1 shows design of the antenna.
The Antenna consists of two vertical radiators that
upper ends stand on distance 1.2… 1.5-meter apart together. It
is an optimal distance for the antenna. However it is possible
do not use the upper boom and place the radiators in triangle
as it shown in dotted line in Figure 1.
Two counterpoises are used for each band. Counterpoises should
be placed at 15… 20 degree to horizon.
The two antenna Radiators
fed by 150- Ohm two wires line. The line consists of from bottom
antenna wire and wire in thick plastic insulation that is wound
around the bottom line (marked in red on Figure
1). Length of the wire should be near in 20 percent
more the lower parts of the antenna.
Mast and upper boom may be
made from any insulation stuff- wood or plastic. Lower horizon
wire of the antenna should be placed at some height above the
ground. One meter should be enough (more is better). Antenna may
be scaled to another ham HF bands.