NEC-LIST: State of the Art ?

Hi,

Is NEC 4 considered state of the art in terms of wire antenna modelling ?
Are there alternatives that provide similar performance ?
We have been using wire grids to model antennas on structures. When I
mentioned this to a non antenna modelling colleague he thought that using
wire grids "couldn't be right". These types of questions can be challenging
and deserve an answer.
Wire grids provide a representation of a solid surface and here are
guidelines for constructing them. I wondered if there were alternatives for
non-closed surfaces.
So, which modelling programs are considered state of the art in terms of
modelling the influence of structures on antenna performance ?

Thanks,

Michael.

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