trianglelimit.nec

zip contains tool for Antenna Modelling with examples

CM Test Limit Triangle without warnings
CM to test 4nec2 geometry checks
CM From ARRL course page 3.27 
CE
GW 1 81 0 -2 0 0 2 0 0.0005	' Thin wire
GW 2 41 0 -2 0 0 0 0.1 0.0005
GW 3 41 0 2 0 0 0 0.1 0.0005
GE 0
EX 0 1 41 0 1 0
FR 0 1 0 0 299.8 1
EN