NEC-LIST: NEC4WIN95 versus NEC2 for quads

I've been modelling a quad with NEC4WIN95 and I'm fairly happy with
the model I've come up with. I just ran it in NEC2 though and the
results are quite different. NEC2 shows maximum radiation at quite a
high angle; NEC4WIN95 says the maximum is at 14 degrees, which is what
I want.

Now the NEC4WIN95 model knows the height above ground, while the NEC2
model is in free space. How can I tell NEC2 the height above ground
for Z = 0? How much difference will it make? Varying the height above
ground in NEC4WIN95 does change the results quite a lot. (I did not
try using a really large height to approximate free space.)

How inaccurate is the modelling of quads with NEC4WIN95 v2 (which
according to the help is based on MININEC 3)? I like the results from
that program but would not like to build the antenna and find out that
the modelling was flawed.

thanks

Hamish VK3SB
Received on Mon Feb 28 2000 - 05:16:45 EST