Topband: Verticals and Radials

[k6se@juno.com]

Bill, K2WH wrote:

"What would be the radiation pattern of a vertical with ground radials in
a 180 degree arc.  That is, 60 radials on only (1) side of the vertical
with no radials and average ground in the other 180 degrees."
==========
Over "average" ground the pattern would be slightly oval with a "F/B
ratio" of about 1.33 dB.  Directivity favors the same direction that the
radials run.

The directivity varies with the soil conductivity.  Over "very poor"
soil, the "F/B ratio is about 3.59 dB and over "very good" soil it is
about 0.63 dB.

These results were obtain using EZNEC for a full-size 1/4 vertical with
60 1/4-wave radials covering 180 degrees of a full circle.

73, de Earl, K6SE