Reactance doesn't matter....
> Just ballparking the capacitive coupling.. 4x4ft, 1/2"
away... call it 1.5
> m2, 0.01 m spacing, about 1300 pF. At 4 MHz, about 30
ohms reactance
>
> Comparing the car, say 6x12 ft, 6" away, about 394 pF., at
4MHz, about 120
> ohms reactance.
>
> The flat plate on the ground has a low enough impedance to
the ground that
> it's going to couple pretty strongly, compared to the
truck.
>
> Neither is going to be particularly wonderful, of course.
since it isn't dissipative and simply causes the antenna to
"shift frequency".
The resistance is what causes the loss.
73 Tom
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