01- 2016, # 020
Low Height Narrow Delta Antenna for the 80, 40, 20
and 15- meter Band
Below described Low Height
Narrow Delta Antenna for the 80, 40, 20 and 15- meter Band. The Antenna was simulated by UR0GT for DE7RAO, for
his defined conditions of possibility for antenna placement. However the antenna design should be interesting
for those amateur who has tied conditions for antenna installation
or for amateurs who participated in field day.
The antenna has one long length that may be placed
across backyard to nearly tree. Then two short sides may be attached
to fence or to small mast or tree.
Antenna has resonances at
80, 40, 20 and 15- meter bands. One side of the antenna made by
two wires. It allows increase input impedance of the antenna at
the 80- meter Band.
Figure 1 shows design of the antenna. Antenna simulated
for height 7- meter above the ground. Antenna simulated for bare
wire in diameter 2- mm. If it would be used wire in plastic insulation
the antenna length should be decreased to 1.5 percent or near
Antenna maybe fed through
ATU by 50- Ohm coaxial cable or two wire line. However most of
transceivers with internal ATU may match the antenna directly.
Antenna may be rescaled to
higher bands. However the antenna when placed at low height should
be simulated with NEC for MMANA. It is allowed to get strictly
data for length of antenna wires and for input impedance of the