Some receivers for AVIA-Band (118- 136- MHz) are designed
for 75- Ohm -antennas. Below described simple Ground Plane antenna
for the band that has input impedance 75-Ohm at good SWR on 118-
The Ground Plane antenna has capacitive load at the
antenna base. Due to the load antenna has input impedance close
to the 75- Ohm and very broad pass band. Using such method it
is possible to design broad band antennas for other frequency
1 shows design of the antenna. Figure 2 shows impedance of the antenna (antenna
placed at 8- meter above the real ground). Figure 3 shows SWR of the antenna
(antenna placed at 8- meter above the real ground). Figure 4 shows DD of the antenna
(antenna placed at 8- meter above the real ground).
Standard antenna mast for AVIA antennas in Russia has height 8- meter.
The MMANA model of the Ground
Plane for AVIA Band may be loaded: http: // www.antentop.org/016/avia_016.htm