Re: dipole made of two cb whips?

"Roy Lewallen" wrote
Only a perfect ground ends up creating the same shaped field from a grounded vertical as a free space dipole.
Real ground creates a field shape which is very significantly different.
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A 1/4 to ~1/2-wave vertical monopole used with the typical radial ground system of MW broadcast stations actually does _generate_ very nearly the same pattern and peak field as a free-space dipole of twice the length as that monopole. This has been demonstrated by field measurements going back to 1937 (George Brown, et al).

It is only after the radiated wave leaves the vicinity of the antenna that the conductivity of real earth begins to affect it. These effects accumulate, and at distant ranges, there is more reduction in the groundwave field than at angles above the horizontal plane

That is why the pattern takes on the shape shown for it by pattern analysis of this hardware for an infinite distance -- which has zero field in the horizontal plane. But it doesn't have that shape as it leaves the radiation system.

RF

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