Topband: A wee bit more on power coupling

[Robert Brown]

Friends in Radio Land -
 
There seems to be some confusion about insertion loss from power
coupling of antennas across the USA.  So I list below principal
features for verticals for the four corners of the USA (Seattle,
Los Angeles, Boston and Atlanta) as well as its center (Omaha):
 
         W7        W6        W0        W1        W4
        (dB)      (dB)      (dB)      (dB)      (dB)
 
 N      -0.1      -0.1      -0.1      -0.1      -0.1
E-W     -1.1      -1.6      -1.2      -1.6      -1.8
 S      -1.8      -2.3      -1.9      -1.9      -2.3
 
and I list below the same for the four corners of Europe (England,
Spain, Leningrad and Turkey) as well as its center (Berlin):
 
         G         EA        DL        UA1       TA
        (dB)      (dB)      (dB)      (dB)      (dB)
 
 N      -0.1      -0.2      -0.1      -0.1      -0.1
E-W     -1.6      -2.4      -1.6      -1.2      -2.2
 S      -2.2      -2.6      -2.2      -1.9      -2.6
 
For horizontal dipoles oriented E-W, power coupling in North
America and Europe is still very unfavorable to the north, as
shown below for central locations in those continents:
 
                    W0        DL
                   (dB)      (dB)
 
            N     -24.0     -24.0
           E-W     -6.6      -5.3
            S      -4.7      -4.1
 
So verticals would be the antenna of choice in NA and EU.
 
73,
 
Bob, NM7M