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Number of Radials
Length of each radial in
wavelengths
Spacing of radials in degrees
TOTAL length of radial wire
installed, in wavelengths
Power gain (dB) due to
increased efficiency
Radiation take-off angle in
degrees
Feed-point impedance in ohms
with a 1/4-wave radiating element
Radial end buried
NOTE: TABLE 1 is optimized for poor earth
conditions.
Conductivity
Siemens/meter and the Relative Dielectric
Constant = 7. Better earth conditions will
increase the power gain and lower the take-off
angle for systems A-D.
Table 1
Optimum Ground System Configuration
=
0.0001
A
B
C
16
24
36
.1
.125
.15
22.5
15
10
1.6
3
5.4
3.0
3.6
4.0 4.7
30
30
30
52
46
43
YES
YES
YES
Systems E and F will not be affected as much,
except for additional lowering of the take-off
angle by as much as 5 to 8 degrees. See pages
28-30
of
"QST"
information on radial systems for verticals.
D
E
60
90
.2
.25
6
4
12
22.5
5.2 6.0
30
28
40
37
NO
NO
June,
1985
for
F
120
.4
3
48
24
35
NO
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