4NEC2:

Yuri, what a strange coincedence. This because I exactly had the same
thoughts.

I must admit however that I am not such a (theoretical) antenne
expert, so I think it's a bit too much effort to create the equations
for terrain analysis myself. That's why I already took a look at both
the K6STI program and Dean Straw's latest HFTA program, (both created
to do terrain analysis) and to investigate how much effort it would
take to interface with one of them.
When looking at these programs I realized however that both of them
are limited to horizontal polarized ((stacks of) Yagi) antennas.


I understand that Dan is coming up nd testing new version of his terrain
program. I have not seen it yet.
Fine tuning the vertical arrays can use contribution from the terrain (like
being on the shore with sand dunes behind), This would greatly enhance the
modeling capabilities.

Keep it in the forefront :-)

73 Yuri