Antenna modeling tools aren't intended to model propagation
effects. But the stronger the signal radiated in the right direction,
the stronger the received signal will be. And the strength of the
radiated signal in each direction is what the antenna modeling
program shows.
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But whenever a far-field NEC model uses any kind of real ground in the
analysis, modeling the effects of the propagation environment along with the
native radiation launched by the antenna is exactly what occurs.

This is why some think that the far field radiated by a vertical monopole
less than 5/8-wave high is zero in the horizontal plane, when in fact at
every operating frequency, it is always the highest field the antenna
produces.

RF