Reg,

Thanks. I assume the coil is located next to the feed point?

In the case of a single ground radial what can you say about the
radiation pattern?

Thanks,

Dan
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Yes, the loading coil is located next to the feedpoint. I forgot to
mention it in the program notes.

The antenna used with a counterpoise will very likely be a simple
vertical or an inverted-L

When the counterpoise is not near the ground the radiation pattern of
the whole system, antenna plus counterpoise plus feedline, will be
somthing like that of a bent, off-centre-fed dipole, which extends
between the top of the vertical antenna and the end of the
counterpoise, and slopes at an angle relative to the vertical.

It will be non-descript and have no interesting properties, not worth
the time and trouble of modelling with Eznec.

When the counterpoise is lying on the ground the radiation pattern
will be similar to that of the antenna alone. But it cannot be
modelled with Eznec.

Counterpoises are useful because they allow end-fed antennas to work
moderately well, at one frequency, when a good ground connection is
not available. With an antenna wire they behave as an off-cenre-fed
bent dipole with one end near the ground.
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Reg.