CM ZL Special  driven element with two passive directors at 51MHz using VK2ZIW rough values - Model by VK3DIP 
CM 
CE
SY H = 10	'Height, main antenna
SY H6 = 9.5	'Height, feedpoint below
SY F1=2.85395	'Length fed Element 1
SY F1o2 = F1/2	'Half length fed Element 1
SY F2=2.877499	'Length fed Element 2
SY F2o2 = F2/2	'Half Length Element 2
SY ES=0.75	'ZL fed Elements Spacing
SY TLZ1 = 25	'Transmission Line Impedance, do real length at build
SY TLZ2 = 100	'Transmission Line Impedance
SY TLZ3 = 25	'Transmission Line Impedance, matching
SY TLVF = 1	'TL velocity Factor, not used by 4nec2
SY TLEP=0.4	'TL length, 6m / 8, phasing length
SY TLE1 = 0.200	'TL FE1 to junction, also torroid balun winding
SY TLE2 = TLEP + TLE1	'TL FE2, phasing fixed
SY TLM3=0.943416	'TL  1/4 wave matching
SY FE1P =0	'Position of Fed Element 1
SY FE2P = FE1P - ES	'Position of Fed Element 2
SY F5P = FE1P - ES/6	'Position of Feed dummy element 9
SY LF5=0.2	'Length Feed dummy
SY LF5o2 = LF5/2	'Half Length Feed dummy Element
SY WD = 0.012	'Wire Diameter
SY WR = WD/2	'Wire Radius
SY L3=2.675	'Length Element 3  ( Director D1)
SY L3o2 = L3/2	'Half Length Element 3
SY D1S=0.75	'Spacing to D1 from FE1
SY D1P = FE1P + D1S	'Position of Director D1
SY L4=2.475	'Length Element 4  ( D2)
SY L4o2 = L4/2	'Half Length Element 3
SY D2S=1.53	'Spacing to D2 from FE1
SY D2P = FE1P + D2S	'Position of Director D2
GW	3	41	+F1o2	FE1P	H	-F1o2	FE1P	H	WR
GW	5	5	+LF5o2	F5P	H	-LF5o2	F5P	H	WR
GW	6	5	+LF5o2	F5P	H6	-LF5o2	F5P	H6	WR
GW	7	41	-F2o2	FE2P	H	+F2o2	FE2P	H	WR
GW	9	41	-L3o2	D1P	H	+L3o2	D1P	H	WR
GW	10	41	-L4o2	D2P	H	+L4o2	D2P	H	WR
GE	0
GN	-1
EK
EX	0	6	3	0	1	0	0
TL	5	3	3	21	TLZ1	TLE1	0	0	0	0
TL	5	3	7	21	TLZ2	TLE2	0	0	0	0
TL	6	3	5	3	TLZ3	TLM3	0	0	0	0
FR	0	0	0	0	50	0
EN