[Antennaware] EZNEC how to choose number of segments

[David Gould]

Most of my modelling has been with wire antennas but now I am modelling 
some verticals with elements having diameters of between 38mm and 25mm 
for 20m and 40m (and using drooping elevated radials made of wire)

I usually use around 9 or 11 segments for a 1/4 wave element.  I noticed 
that when I changed the number of segments the results for things like 
feed impedance changed quite dramatically.

Are there some guidelines for the number of segments for a 1/4 wave 
straight wire element?

How is the choice of segment length affected by the diameter of the 
element tubing?  Is there a limit on the ratio of segment length to 
segment diameter?

73,

Dave G3UEG