NEC-LIST: Which nec variant, what are the limits?

After doing some looking at the various incantations of nec2 available
there seems to be various limits upon model size and complexity as well
as single vs. Double precision. What differences do these things make
in practical use?

how complex do models really need to be (number of segments. Etc) to get
decent results? I'd like to be able to model things like an array of
16, 24 element yagis with decent results.

What practical differences will I see in result accuracy and speed of
execution between single and double precision code?

Thanks,

Eric
--efort

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