The antenna works with good SWR at the frequencies
3.500- 4.000- kHz. All antennas, what I made before (there were
I.Vs., dipoles and slopers) did
not work at such wide band. The antenna has input impedance 75-
Ohm. It allows use a chip TV coaxial cable for the feeding of
the antenna. The 75- Ohm coaxial as usual is matched well with
the 50- Ohm output of the transceiver. Figure
1 shows the design of the antenna.
It is a slope stub antenna. The antenna may be placed
at 30- 60- degree to the horizon.
two radials (more radials are better) that are placed at 120-
degree to each other. Antenna has input impedance (at terminals
“x-x1’) close to 300- Ohm. A lambda/4 length of a
150- Ohm coaxial cable does match the input impedance with the
feeding coaxial cable. Instead of the cable it is possible use
a transformer 1:4. The antenna wire is connected to the ground.
So the antenna is low noise at reception and lighting protected.
Antenna may be recalculated for other bands.