gndplane.nec

zip contains tool for Antenna Modelling with examples

CM 40-meter Groundplane with Sloping Radials, by K6STI
CE 
SY len = 63.65		' Optimized for resonance 
GW	1	2	0	0	30	0	0	40	.2in/ft
GW	2	2	0	0	40	0	0	49.5	.15in/ft
GW	3	2	0	0	49.5	0	0	58	.12in/ft
GW	4	1	0	0	58	0	0	len	.1in/ft
GW	5	8	0	0	30	-23	0	7	#12/ft
GW	6	8	0	0	30	23	0	7	#12/ft
GW	7	8	0	0	30	0	-23	7	#12/ft
GW	8	8	0	0	30	0	23	7	#12/ft
GS	0	0	ft
GE	0
EX	0	1	1	00	1.0	0.0
'
GN	-1
FR	0	1	0	0	 7.15
EN
'This file shows how to model radiators employing telescoping tubing.
'The segmentation above gives good input-impedance accuracy for this
'model with bent-wire junctions.