I've been trying to get acquainted with the 4NEC2 antenna modeling program. Perhaps this is obvious, but it's not clear to me that wires with one end in the same place are connected. I'm attempting to model a simple quarter-wave antenna with four radials, but I'm getting results that seem suspect. I shouldn't be seeing this symmetric pattern (picture below) along the $z$ direction. It makes no sense. It's as if the radials weren't even there.
I've compared my results to those of a vertical with four radials from Dick Reid, KK4OBI (NEC file here). Those show a strong asymmetry, as I would expect. There seems to be some deep magic going on here in the NEC file that I don't understand.
-Rod AD0YX (call sign updated too!)
Here's the NEC file I'm using (updated)
CM High-altitude balloon 70cm antenna CM Rodney Price AD0YX July 2017 CE SY freq=434.65 'In wideband simplex band SY len=71/freq 'meters/sec over MHz SY rlen=len 'length of radials SY angle=30 'angle at which radials droop SY rdroop=rlen*cos(angle) 'droop along x or y axis SY zdroop=-rlen*sin(angle) 'droop along z axis SY height=0 'height of bottom of vertical element above radials GW 1 11 0 0 height 0 0 height+len #8 GW 2 11 0 0 0 rdroop 0 zdroop #8 GW 3 11 0 0 0 0 rdroop zdroop #8 GW 4 11 0 0 0 -rdroop 0 zdroop #8 GW 5 11 0 0 0 0 -rdroop zdroop #8 GE 0 GN -1 EK EX 0 1 1 0 1 0 0 FR 0 0 0 0 freq 0 EN
Here's the radiation pattern from 4NEC2:
Here's what I get when I run the KK4OBI model: