CM Simple yagi based on the dimensions outlined in https://youtu.be/SKumu3twopc
CM Model created by Roger Walker, GW6HRU
CM Feed impedance is 37.5 ohms
CM
CE
SY H=5		'Height above ground
SY F=145.0	'Target centre frequency
SY R=0.0005	'Wire radius
SY V=0.948	'Wire velocity (also adjusts for nearness to ground and reflector)
SY SR=1.05	'Scale of reflector vs driven
SY SD=0.95	'Scale of director vs driven
SY SG=0.20	'Scale of gap vs wavelength
SY CW=V*299.792458/F	'Wavelength
SY CF=CW/25	'Feedpoint size
SY CL=CW/4	'Driven wire length (each side is a 1/4 wave)
SY CR=CL*SR	'Reflector length (each side)
SY CG=CW*SG	'Gap between elements
GW	99	1	-CF/2	0	H	CF/2	0	H	R	'Feed point is in centre of driven
GW	11	10	-CF/2	0	H	-CL	0	H	R	'Left driven
GW	12	10	CF/2	0	H	CL	0	H	R	'Right driven
GW	20	20	-CR	-CG	H	CR	-CG	H	R	'Reflector
GW	31	20	-CL*SD	CG	H	CL*SD	CG	H	R	'Director #1
GW	32	20	-CL*(SD^2)	2*CG	H	CL*(SD^2)	2*CG	H	R	'Director #2
GW	33	20	-CL*(SD^3)	3*CG	H	CL*(SD^3)	3*CG	H	R	'Director #3
GW	34	20	-CL*(SD^4)	4*CG	H	CL*(SD^4)	4*CG	H	R	'Director #4
GE	1									'Ground model, 1=Real Ground
LD	5	0	0	0	58000000				
GN	2	0	0	0	4	0.003				'2=Moderate, 4=dielectric constant, 0.003=Conductivity
EK
EX	0	99	1	0	1	0	0			'Load 0=Voltage source, feeding tag 99, segment 1
FR	0	0	0	0	145.0	0				'Default frequency
EN