CM Example of 2m end fed halfwave antenna using a step-up transformer that is directly modeled in NEC wires. A series capacitance tames the native inductance at the feed point.
CM Author: John S. Huggins, kx4o www.hamradio.me
CE
SY Element=1.005
SY Wirerad=.000635
SY coillen=.05
SY coilbase=0
SY tapX=.005
SY TapZ=.0075
SY CapPf=4.560774
SY CoaxLeadLen=.5
GW	1	121	0	0	coilbase+coillen	0	0	coilbase+coillen+Element	Wirerad
GW	2	1	TapX+.010	0	0	TapX+.01	0	TapZ/3	.00015
GW	3	1	TapX+.010	0	TapZ/3	TapX+.01	0	TapZ/3*2	.00015
GW	4	1	TapX+.010	0	TapZ/3*2	TapX+.01	0	TapZ	.00015
GW	5	1	.01	0	0	TapX/2+.01	0	0	.00015
GW	6	1	TapX/2+.01	0	0	TapX+.01	0	0	.00015
GW	7	1	.01	0	TapZ	TapX/2+.01	0	TapZ	.00015
GW	8	1	TapX/2+.01	0	TapZ	TapX+.01	0	TapZ	.00015
GW	9	3	TapX+.01	0	0	TapX+.01+(CoaxLeadLen/100)	0	0	.00015
GW	101	1	.01	0	coilbase	.007071	.007071	coilbase+.000313	wirerad
GW	102	1	.007071	.007071	coilbase+.000313	0	.01	coilbase+.000625	wirerad
GW	103	1	0	.01	coilbase+.000625	-.007071	.007071	coilbase+.000938	wirerad
GW	104	1	-.007071	.007071	coilbase+.000938	-.01	0	coilbase+.00125	wirerad
GW	105	1	-.01	0	coilbase+.00125	-.007071	-.007071	coilbase+.001563	wirerad
GW	106	1	-.007071	-.007071	coilbase+.001563	0	-.01	coilbase+.001875	wirerad
GW	107	1	0	-.01	coilbase+.001875	.007071	-.007071	coilbase+.002188	wirerad
GW	108	1	.007071	-.007071	coilbase+.002188	.01	0	coilbase+.0025	wirerad
GW	109	1	.01	0	coilbase+.0025	.007071	.007071	coilbase+.002813	wirerad
GW	110	1	.007071	.007071	coilbase+.002813	0	.01	coilbase+.003125	wirerad
GW	111	1	0	.01	coilbase+.003125	-.007071	.007071	coilbase+.003438	wirerad
GW	112	1	-.007071	.007071	coilbase+.003438	-.01	0	coilbase+.00375	wirerad
GW	113	1	-.01	0	coilbase+.00375	-.007071	-.007071	coilbase+.004063	wirerad
GW	114	1	-.007071	-.007071	coilbase+.004063	0	-.01	coilbase+.004375	wirerad
GW	115	1	0	-.01	coilbase+.004375	.007071	-.007071	coilbase+.004688	wirerad
GW	116	1	.007071	-.007071	coilbase+.004688	.01	0	coilbase+.005	wirerad
GW	117	1	.01	0	coilbase+.005	.007071	.007071	coilbase+.005313	wirerad
GW	118	1	.007071	.007071	coilbase+.005313	0	.01	coilbase+.005625	wirerad
GW	119	1	0	.01	coilbase+.005625	-.007071	.007071	coilbase+.005938	wirerad
GW	120	1	-.007071	.007071	coilbase+.005938	-.01	0	coilbase+.00625	wirerad
GW	121	1	-.01	0	coilbase+.00625	-.007071	-.007071	coilbase+.006563	wirerad
GW	122	1	-.007071	-.007071	coilbase+.006563	0	-.01	coilbase+.006875	wirerad
GW	123	1	0	-.01	coilbase+.006875	.007071	-.007071	coilbase+.007188	wirerad
GW	124	1	.007071	-.007071	coilbase+.007188	.01	0	coilbase+.0075	wirerad
GW	125	1	.01	0	coilbase+.0075	.007071	.007071	coilbase+.007813	wirerad
GW	126	1	.007071	.007071	coilbase+.007813	0	.01	coilbase+.008125	wirerad
GW	127	1	0	.01	coilbase+.008125	-.007071	.007071	coilbase+.008438	wirerad
GW	128	1	-.007071	.007071	coilbase+.008438	-.01	0	coilbase+.00875	wirerad
GW	129	1	-.01	0	coilbase+.00875	-.007071	-.007071	coilbase+.009063	wirerad
GW	130	1	-.007071	-.007071	coilbase+.009063	0	-.01	coilbase+.009375	wirerad
GW	131	1	0	-.01	coilbase+.009375	.007071	-.007071	coilbase+.009688	wirerad
GW	132	1	.007071	-.007071	coilbase+.009688	.01	0	coilbase+.01	wirerad
GW	133	1	.01	0	coilbase+.01	.007071	.007071	coilbase+.010313	wirerad
GW	134	1	.007071	.007071	coilbase+.010313	0	.01	coilbase+.010625	wirerad
GW	135	1	0	.01	coilbase+.010625	-.007071	.007071	coilbase+.010938	wirerad
GW	136	1	-.007071	.007071	coilbase+.010938	-.01	0	coilbase+.01125	wirerad
GW	137	1	-.01	0	coilbase+.01125	-.007071	-.007071	coilbase+.011563	wirerad
GW	138	1	-.007071	-.007071	coilbase+.011563	0	-.01	coilbase+.011875	wirerad
GW	139	1	0	-.01	coilbase+.011875	.007071	-.007071	coilbase+.012188	wirerad
GW	140	1	.007071	-.007071	coilbase+.012188	.01	0	coilbase+.0125	wirerad
GW	141	1	.01	0	coilbase+.0125	.007071	.007071	coilbase+.012813	wirerad
GW	142	1	.007071	.007071	coilbase+.012813	0	.01	coilbase+.013125	wirerad
GW	143	1	0	.01	coilbase+.013125	-.007071	.007071	coilbase+.013438	wirerad
GW	144	1	-.007071	.007071	coilbase+.013438	-.01	0	coilbase+.01375	wirerad
GW	145	1	-.01	0	coilbase+.01375	-.007071	-.007071	coilbase+.014063	wirerad
GW	146	1	-.007071	-.007071	coilbase+.014063	0	-.01	coilbase+.014375	wirerad
GW	147	1	0	-.01	coilbase+.014375	.007071	-.007071	coilbase+.014688	wirerad
GW	148	1	.007071	-.007071	coilbase+.014688	.01	0	coilbase+.015	wirerad
GW	149	1	.01	0	coilbase+.015	.007071	.007071	coilbase+.015313	wirerad
GW	150	1	.007071	.007071	coilbase+.015313	0	.01	coilbase+.015625	wirerad
GW	151	1	0	.01	coilbase+.015625	-.007071	.007071	coilbase+.015938	wirerad
GW	152	1	-.007071	.007071	coilbase+.015938	-.01	0	coilbase+.01625	wirerad
GW	153	1	-.01	0	coilbase+.01625	-.007071	-.007071	coilbase+.016563	wirerad
GW	154	1	-.007071	-.007071	coilbase+.016563	0	-.01	coilbase+.016875	wirerad
GW	155	1	0	-.01	coilbase+.016875	.007071	-.007071	coilbase+.017188	wirerad
GW	156	1	.007071	-.007071	coilbase+.017188	.01	0	coilbase+.0175	wirerad
GW	157	1	.01	0	coilbase+.0175	.007071	.007071	coilbase+.017813	wirerad
GW	158	1	.007071	.007071	coilbase+.017813	0	.01	coilbase+.018125	wirerad
GW	159	1	0	.01	coilbase+.018125	-.007071	.007071	coilbase+.018438	wirerad
GW	160	1	-.007071	.007071	coilbase+.018438	-.01	0	coilbase+.01875	wirerad
GW	161	1	-.01	0	coilbase+.01875	-.007071	-.007071	coilbase+.019063	wirerad
GW	162	1	-.007071	-.007071	coilbase+.019063	0	-.01	coilbase+.019375	wirerad
GW	163	1	0	-.01	coilbase+.019375	.007071	-.007071	coilbase+.019688	wirerad
GW	164	1	.007071	-.007071	coilbase+.019688	.01	0	coilbase+.02	wirerad
GW	165	1	.01	0	coilbase+.02	.007071	.007071	coilbase+.020313	wirerad
GW	166	1	.007071	.007071	coilbase+.020313	0	.01	coilbase+.020625	wirerad
GW	167	1	0	.01	coilbase+.020625	-.007071	.007071	coilbase+.020938	wirerad
GW	168	1	-.007071	.007071	coilbase+.020938	-.01	0	coilbase+.02125	wirerad
GW	169	1	-.01	0	coilbase+.02125	-.007071	-.007071	coilbase+.021563	wirerad
GW	170	1	-.007071	-.007071	coilbase+.021563	0	-.01	coilbase+.021875	wirerad
GW	171	1	0	-.01	coilbase+.021875	.007071	-.007071	coilbase+.022188	wirerad
GW	172	1	.007071	-.007071	coilbase+.022188	.01	0	coilbase+.0225	wirerad
GW	173	1	.01	0	coilbase+.0225	.007071	.007071	coilbase+.022813	wirerad
GW	174	1	.007071	.007071	coilbase+.022813	0	.01	coilbase+.023125	wirerad
GW	175	1	0	.01	coilbase+.023125	-.007071	.007071	coilbase+.023438	wirerad
GW	176	1	-.007071	.007071	coilbase+.023438	-.01	0	coilbase+.02375	wirerad
GW	177	1	-.01	0	coilbase+.02375	-.007071	-.007071	coilbase+.024063	wirerad
GW	178	1	-.007071	-.007071	coilbase+.024063	0	-.01	coilbase+.024375	wirerad
GW	179	1	0	-.01	coilbase+.024375	.007071	-.007071	coilbase+.024688	wirerad
GW	180	1	.007071	-.007071	coilbase+.024688	.01	0	coilbase+.025	wirerad
GW	181	1	.01	0	coilbase+.025	.007071	.007071	coilbase+.025313	wirerad
GW	182	1	.007071	.007071	coilbase+.025313	0	.01	coilbase+.025625	wirerad
GW	183	1	0	.01	coilbase+.025625	-.007071	.007071	coilbase+.025938	wirerad
GW	184	1	-.007071	.007071	coilbase+.025938	-.01	0	coilbase+.02625	wirerad
GW	185	1	-.01	0	coilbase+.02625	-.007071	-.007071	coilbase+.026563	wirerad
GW	186	1	-.007071	-.007071	coilbase+.026563	0	-.01	coilbase+.026875	wirerad
GW	187	1	0	-.01	coilbase+.026875	.007071	-.007071	coilbase+.027188	wirerad
GW	188	1	.007071	-.007071	coilbase+.027188	.01	0	coilbase+.0275	wirerad
GW	189	1	.01	0	coilbase+.0275	.007071	.007071	coilbase+.027813	wirerad
GW	190	1	.007071	.007071	coilbase+.027813	0	.01	coilbase+.028125	wirerad
GW	191	1	0	.01	coilbase+.028125	-.007071	.007071	coilbase+.028438	wirerad
GW	192	1	-.007071	.007071	coilbase+.028438	-.01	0	coilbase+.02875	wirerad
GW	193	1	-.01	0	coilbase+.02875	-.007071	-.007071	coilbase+.029063	wirerad
GW	194	1	-.007071	-.007071	coilbase+.029063	0	-.01	coilbase+.029375	wirerad
GW	195	1	0	-.01	coilbase+.029375	.007071	-.007071	coilbase+.029688	wirerad
GW	196	1	.007071	-.007071	coilbase+.029688	.01	0	coilbase+.03	wirerad
GW	197	1	.01	0	coilbase+.03	.007071	.007071	coilbase+.030313	wirerad
GW	198	1	.007071	.007071	coilbase+.030313	0	.01	coilbase+.030625	wirerad
GW	199	1	0	.01	coilbase+.030625	-.007071	.007071	coilbase+.030938	wirerad
GW	200	1	-.007071	.007071	coilbase+.030938	-.01	0	coilbase+.03125	wirerad
GW	201	1	-.01	0	coilbase+.03125	-.007071	-.007071	coilbase+.031563	wirerad
GW	202	1	-.007071	-.007071	coilbase+.031563	0	-.01	coilbase+.031875	wirerad
GW	203	1	0	-.01	coilbase+.031875	.007071	-.007071	coilbase+.032188	wirerad
GW	204	1	.007071	-.007071	coilbase+.032188	.01	0	coilbase+.0325	wirerad
GW	205	1	.01	0	coilbase+.0325	.007071	.007071	coilbase+.032813	wirerad
GW	206	1	.007071	.007071	coilbase+.032813	0	.01	coilbase+.033125	wirerad
GW	207	1	0	.01	coilbase+.033125	-.007071	.007071	coilbase+.033438	wirerad
GW	208	1	-.007071	.007071	coilbase+.033438	-.01	0	coilbase+.03375	wirerad
GW	209	1	-.01	0	coilbase+.03375	-.007071	-.007071	coilbase+.034063	wirerad
GW	210	1	-.007071	-.007071	coilbase+.034063	0	-.01	coilbase+.034375	wirerad
GW	211	1	0	-.01	coilbase+.034375	.007071	-.007071	coilbase+.034688	wirerad
GW	212	1	.007071	-.007071	coilbase+.034688	.01	0	coilbase+.035	wirerad
GW	213	1	.01	0	coilbase+.035	.007071	.007071	coilbase+.035313	wirerad
GW	214	1	.007071	.007071	coilbase+.035313	0	.01	coilbase+.035625	wirerad
GW	215	1	0	.01	coilbase+.035625	-.007071	.007071	coilbase+.035938	wirerad
GW	216	1	-.007071	.007071	coilbase+.035938	-.01	0	coilbase+.03625	wirerad
GW	217	1	-.01	0	coilbase+.03625	-.007071	-.007071	coilbase+.036563	wirerad
GW	218	1	-.007071	-.007071	coilbase+.036563	0	-.01	coilbase+.036875	wirerad
GW	219	1	0	-.01	coilbase+.036875	.007071	-.007071	coilbase+.037188	wirerad
GW	220	1	.007071	-.007071	coilbase+.037188	.01	0	coilbase+.0375	wirerad
GW	221	1	.01	0	coilbase+.0375	.007071	.007071	coilbase+.037813	wirerad
GW	222	1	.007071	.007071	coilbase+.037813	0	.01	coilbase+.038125	wirerad
GW	223	1	0	.01	coilbase+.038125	-.007071	.007071	coilbase+.038438	wirerad
GW	224	1	-.007071	.007071	coilbase+.038438	-.01	0	coilbase+.03875	wirerad
GW	225	1	-.01	0	coilbase+.03875	-.007071	-.007071	coilbase+.039063	wirerad
GW	226	1	-.007071	-.007071	coilbase+.039063	0	-.01	coilbase+.039375	wirerad
GW	227	1	0	-.01	coilbase+.039375	.007071	-.007071	coilbase+.039688	wirerad
GW	228	1	.007071	-.007071	coilbase+.039688	.01	0	coilbase+.04	wirerad
GW	229	1	.01	0	coilbase+.04	.007071	.007071	coilbase+.040313	wirerad
GW	230	1	.007071	.007071	coilbase+.040313	0	.01	coilbase+.040625	wirerad
GW	231	1	0	.01	coilbase+.040625	-.007071	.007071	coilbase+.040938	wirerad
GW	232	1	-.007071	.007071	coilbase+.040938	-.01	0	coilbase+.04125	wirerad
GW	233	1	-.01	0	coilbase+.04125	-.007071	-.007071	coilbase+.041563	wirerad
GW	234	1	-.007071	-.007071	coilbase+.041563	0	-.01	coilbase+.041875	wirerad
GW	235	1	0	-.01	coilbase+.041875	.007071	-.007071	coilbase+.042188	wirerad
GW	236	1	.007071	-.007071	coilbase+.042188	.01	0	coilbase+.0425	wirerad
GW	237	1	.01	0	coilbase+.0425	.007071	.007071	coilbase+.042813	wirerad
GW	238	1	.007071	.007071	coilbase+.042813	0	.01	coilbase+.043125	wirerad
GW	239	1	0	.01	coilbase+.043125	-.007071	.007071	coilbase+.043138	wirerad
GW	240	1	-.007071	.007071	coilbase+.043138	-.01	0	coilbase+.04375	wirerad
GW	241	1	-.01	0	coilbase+.04375	-.007071	-.007071	coilbase+.044063	wirerad
GW	242	1	-.007071	-.007071	coilbase+.044063	0	-.01	coilbase+.044374	wirerad
GW	243	1	0	-.01	coilbase+.044375	.007071	-.007071	coilbase+.044688	wirerad
GW	244	1	.007071	-.007071	coilbase+.044688	.01	0	coilbase+.045	wirerad
GW	245	1	.01	0	coilbase+.045	.007071	.007071	coilbase+.045313	wirerad
GW	246	1	.007071	.007071	coilbase+.045313	0	.01	coilbase+.045625	wirerad
GW	247	1	0	.01	coilbase+.045625	-.007071	.007071	coilbase+.045938	wirerad
GW	248	1	-.007071	.007071	coilbase+.045938	-.01	0	coilbase+.04625	wirerad
GW	249	1	-.01	0	coilbase+.04625	-.007071	-.007071	coilbase+.046563	wirerad
GW	250	1	-.007071	-.007071	coilbase+.046563	0	-.01	coilbase+.046835	wirerad
GW	251	1	0	-.01	coilbase+.046835	.007071	-.007071	coilbase+.047188	wirerad
GW	252	1	.007071	-.007071	coilbase+.047188	.01	0	coilbase+.0475	wirerad
GW	253	1	.01	0	coilbase+.0475	.007071	.007071	coilbase+.047813	wirerad
GW	254	1	.007071	.007071	coilbase+.047813	0	.01	coilbase+.048125	wirerad
GW	255	1	0	.01	coilbase+.048125	-.007071	.007071	coilbase+.048438	wirerad
GW	256	1	-.007071	.007071	coilbase+.048438	-.01	0	coilbase+.048750	wirerad
GW	257	1	-.01	0	coilbase+.048750	-.007071	-.007071	coilbase+.049063	wirerad
GW	258	1	-.007071	-.007071	coilbase+.049063	0	-.01	coilbase+.049375	wirerad
GW	259	1	0	-.01	coilbase+.049375	.007071	-.007071	coilbase+.049688	wirerad
GW	260	1	.007071	-.007071	coilbase+.049688	.01	0	coilbase+.05	wirerad
GW	270	1	.01	0	coilbase+.05	0	0	coilbase+.05	wirerad
GE	0
LD	0	8	2	2	0	0	CapPf/1E12
GN	-1
EK
EX	6	3	2	0	1	0	0
FR	0	0	0	0	146	0
EN