15mquad.nec

zip contains tool for Antenna Modelling with examples

CM 	15mQuad
CM The dimensions for this 15 meter quad, modeled in free
CM space, come from the ARRL ANTENNA BOOK, 15th ed., p. 12-2.
CM The design is attributed to W7ZQ. NEC reports an accurate
CM forward gain and front/back ratio. If you've been using
CM ELNEC or other MININEC-based program, you've seen that they
CM give an inaccurate front/back ratio for this antenna.
CE
sy len=1.8541
GW	0	7	0.0	-len	-len	0.0	len	-len	0.00115
GW	0	7	0.0	len	-len	0.0	len	len	0.00115
GW	0	7	0.0	len	len	0.0	-len	len	0.00115
GW	0	7	0.0	-len	len	0.0	-len	-len	0.00115
sy ref=1.8035
GW	1	7	3.048	-ref	-ref	3.048	ref	-ref	0.00115
GW	0	7	3.048	ref	-ref	3.048	ref	ref	0.00115
GW	0	7	3.048	ref	ref	3.048	-ref	ref	0.00115
GW	0	7	3.048	-ref	ref	3.048	-ref	-ref	0.00115
GE	0
EX	6	1	4	0	1	0
GN	-1
FR	0	1	0	0	21.2
EN