The antenna was designed for using at DX- peditions.
Antenna consists of two elements- mast in height 10 meters and
in diameter 30-50-mm (it is reflector) and a dipole for the 20-m
(it is driver). Dipole has length 2x 495 centimeters for bare
copper wire in diameter 1.5-mm (15-AWG). For best operation of
the antenna the mast should be isolated from the ground, for example
with help a simple insulator in height 5- 10 centimeters. Input
impedance for the (tuned) antenna is close to 50-Ohm. Gain is
near 4 = dBi. Main radiation is going up to 20-22 degree to horizon.
The upper part
of the dipole works like guy for the mast. It fixed to the mast
with strong synthetic rope in 50 centimeter length. Lower part
of the dipole hangs free. Lower part of the dipole allows tune
the antenna. Coaxial cable goes aside and down from the mast.
Figure 1 shows the drawing of the Two Element
2 shows Patterns for Two Element Antenna (MMANA made).
Radio club ‘Arktika’ Championship
Photo Credit Line: http://www.arktika.komi.com/Champ_2004.htm