Below described two vertical antennas that work without
any ATU at the 20, 15 and 10 meter Bands. The antennas easy
to made and easy to tune to the bands.
Figure
1 shows Triangle Vertical Antenna. Figure 2
shows the antenna in 3d projection.

Figure
3 shows Vertical Antenna with Inductor. Figure 4
shows the antenna in 3d projection.
The inductor has inductance in 10 microHenry.
Mutual capacitance of the inductor should be not more the 1 pF. For example it is possible to use inductor with OD 4.8
cm, coiled by wire in 1mm dia (19
AWG), gap between turns 1 mm, inductors has 15 turns.

The MMANA model of the Triangle
Vertical Antenna for 20, 15 and 10 meter Bands may be loaded: http: //
www.antentop.org/019/two_verticals_ur0gt_019.htm

The MMANA model of the Vertical
Antenna with Inductor for 20, 15 and 10 meter Bands
may be loaded: http: //
www.antentop.org/019/Two
Vertical Antennas for 20, 15 and 10 meter Bands_019
