NEC2 plot of apt1f.sum

MHz	ohms		mw	SWR
135.000	88.6	-12.7i	5.529	1:1.26
135.500	38.6	+24.2i	9.304	1:2.21
136.000	89.4	-4.1i	5.583	1:1.20
136.500	74.4	-27.9i	5.889	1:1.45
137.000	40.5	-41.2i	6.060	1:2.56
137.500	75.8	-32.6i	5.562	1:1.54
138.000	81.3	-2.9i	6.141	1:1.09
138.500	29.5	-31.7i	7.872	1:3.06
139.000	48.0	-38.4i	6.359	1:2.15
139.500	40.0	-39.5i	6.330	1:2.53
136.500	74.4	-27.9i	5.889	1:1.45
136.600	70.9	+17.1i	6.665	1:1.27
136.700	78.9	-36.9i	5.196	1:1.61
136.800	61.2	+25.1i	6.990	1:1.52
136.900	79.5	-26.9i	5.643	1:1.42
137.000	40.5	-41.2i	6.060	1:2.56
137.100	76.6	-26.9i	5.810	1:1.42
137.200	38.7	-36.8i	6.788	1:2.52
137.300	77.2	-26.1i	5.813	1:1.41
137.400	40.2	-42.1i	5.928	1:2.61
137.500	75.8	-32.6i	5.562	1:1.54
137.600	36.8	-38.0i	6.572	1:2.68
137.700	66.6	-32.5i	6.062	1:1.60
137.800	32.9	-36.9i	6.736	1:2.93
137.900	55.9	-41.0i	5.817	1:1.98
138.000	81.3	-2.9i	6.141	1:1.09

MHz dBi dBd F/B ohms
137.500 3.02 0.88 - 75.8-32.6i

3.11 0.97

CM
CM            APT Quatrifial Helical Antenna
CM	  (Adpated from design by Steve Blackmore)
CM
CM		     Assuming R0=75
CM
CE345678-1-2345678-2-2345678-3-2345678-4-2345678-5-2345678-6-2345678-7-2345678-8
GH  1   40    3.6     0.9        0.1       0.1       0.1      0.1       .01
GM  1    1    0       0          180       0         0        0         1
GW  4   15    0.1     0.0        0.0       -.1       0.0      0.0       .01
GW  5   15    0.      0.1        0.9       0.        -.1      0.9       .01
GM  0    0    0       0          90        0         0        0.05      0
GH  6   40    4       1.         0.1       0.1       0.1      0.1       .01
GM  1    1    0       0          180       0         0        0         6
GW  8   15    0.1     0          0.        -.1       0.       0.        .01
GW  9   15    0       0.1        1.        0.        -.1      1.0       .01
GE
EX  0    4    8       0          1.       0.
TL  4    8    8    8  -75        0
FR  0   10    0       0          135.0    .5
XQ
FR  0   16    0       0          136.5    .1
XQ
FR  0    1    0       0          137.5    0
RP  0    1   73  111        90         0        90         5
RP  0   73    1  111        90         0        -5        90
EN