Fact 1.

Any loading coil of finite length contributes towards to the total
radiation.

Fact 2.

The input and output currents of a loading coil of finite length are always
different from each other.

Fact 3.

The radiation pattern of a short vertical is fixed and remains independent
of the location/height of the loading coil.

Fact 4.

Computer programs do not tell gospel truths. They are at least as
unreliable as their human programmers.

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Reg.