Jim Miller wrote:
I downloaded the demo of EZNEC4 to see what it would show for a 88ft
doublet 50ft in the air fed by 300ohm twinlead.

When I run the SWR plot it shows over 100:1 with minima near 2:1 at
6.5Mhz and 11.75Mhz.

Does this sound about right or am I not modeling it correctly?

tnx
jtm

Hi Jim, The 6.5 Mhz SWR sounds about right, the 11.75Mhz does not.
What are you trying to do, an exercise in modeling, or a specific
antenna and transmission line for a specific band?
This is just me, but for complete antenna systems, I use EZNEC for
the antenna input Impedance, and other stuff for the transmission lines
and matching networks.
Gary N4AST