CM 5-element cubical Quad for 2m, using https://www.kn7f.com/2M5eQuad.htm a a starting point
CM Original was 11.3dBi/1:1.34 at 146MHz, this is 11.5dBi/1:1.015 at 145MHz (11.6dBi/1:1.44 at 146MHz).
CM Modelled by Roger Walker, GW6HRU
CE
SY F=	145.0	'Centre frequency
SY H=	7.0	'Height above ground
SY R=	0.0025	'Wire radius
SY V=	1.031	'Raditating element length (vs wavelength)
SY C=	0.02	'Corner cutoff
SY SR=	1.043	'Scale between elements (driven to reflector)
SY SD1=	1.038	'Scale between elements (driven to director 1)
SY SD23=1.024	'Scale between elements (director 1->2 and 2->3)
SY DR=	-0.46	'0.457	'Distance between Driven and reflector
SY D1=	0.41	'0.406	'Distance between Driven and 1st director
SY D2=	D1-DR	'0.864	'Distance between Driven and 2nd director
SY D3=	D2+D1	'1.270	'Distance between Driven and 3nd director
SY CC=	sqr(2*(C^2))	'Corner cutout X/Y length
SY CLD=	V*299.792458/F	'84*0.0254	Wavelength = loop circumference Driven
SY CHD=	(CLD-4*CC)/8	'Half side length
SY CLR=	SR*CLD	'88*0.0254	Wavelength = loop circumference Reflector
SY CHR=	(CLR-4*CC)/8	'Half side length
SY CL1=	CLD/SD1	'80*0.0254	Wavelength = loop circumference Director
SY CH1=	(CL1-4*CC)/8	'Half side length
SY CL2=	CL1/SD23	'78*0.0254	Wavelength = loop circumference Director
SY CH2=	(CL2-4*CC)/8	'Half side length
SY CL3=	CL2/SD23	'76*0.0254	Wavelength = loop circumference Director
SY CH3=	(CL3-4*CC)/8	'Half side length
GW	1	9	-CHD	0	H-(CHD+CC)	CHD	0	H-(CHD+CC)	R	'Bottom element
GW	2	1	CHD	0	H-(CHD+CC)	CHD+CC	0	H-CHD	R	'Bottom right chamfer
GW	3	9	CHD+CC	0	H-CHD	CHD+CC	0	H+CHD-CC	R	'Right side
GW	4	1	CHD+CC	0	H+CHD-CC	CHD	0	H+CHD	R	'Top right chamfer
GW	5	9	CHD	0	H+CHD	-CHD	0	H+CHD	R	'Top element
GW	6	1	-CHD	0	H+CHD	-(CHD+CC)	0	H+CHD-CC	R	'Top left chamfer
GW	7	9	-(CHD+CC)	0	H+CHD-CC	-(CHD+CC)	0	H-CHD	R	'Left side
GW	8	1	-(CHD+CC)	0	H-CHD	-CHD	0	H-(CHD+CC)	R	'Bottom left chamfer
GW	21	9	-CHR	DR	H-(CHR+CC)	CHR	DR	H-(CHR+CC)	R	'Bottom element
GW	22	1	CHR	DR	H-(CHR+CC)	CHR+CC	DR	H-CHR	R	'Bottom right chamfer
GW	23	9	CHR+CC	DR	H-CHR	CHR+CC	DR	H+CHR-CC	R	'Right side
GW	24	1	CHR+CC	DR	H+CHR-CC	CHR	DR	H+CHR	R	'Top right chamfer
GW	25	9	CHR	DR	H+CHR	-CHR	DR	H+CHR	R	'Top element
GW	26	1	-CHR	DR	H+CHR	-(CHR+CC)	DR	H+CHR-CC	R	'Top left chamfer
GW	27	9	-(CHR+CC)	DR	H+CHR-CC	-(CHR+CC)	DR	H-CHR	R	'Left side
GW	28	1	-(CHR+CC)	DR	H-CHR	-CHR	DR	H-(CHR+CC)	R	'Bottom left chamfer
GW	31	9	-CH1	D1	H-(CH1+CC)	CH1	D1	H-(CH1+CC)	R	'Bottom element
GW	32	1	CH1	D1	H-(CH1+CC)	CH1+CC	D1	H-CH1	R	'Bottom right chamfer
GW	33	9	CH1+CC	D1	H-CH1	CH1+CC	D1	H+CH1-CC	R	'Right side
GW	34	1	CH1+CC	D1	H+CH1-CC	CH1	D1	H+CH1	R	'Top right chamfer
GW	35	9	CH1	D1	H+CH1	-CH1	D1	H+CH1	R	'Top element
GW	36	1	-CH1	D1	H+CH1	-(CH1+CC)	D1	H+CH1-CC	R	'Top left chamfer
GW	37	9	-(CH1+CC)	D1	H+CH1-CC	-(CH1+CC)	D1	H-CH1	R	'Left side
GW	38	1	-(CH1+CC)	D1	H-CH1	-CH1	D1	H-(CH1+CC)	R	'Bottom left chamfer
GW	41	9	-CH2	D2	H-(CH2+CC)	CH2	D2	H-(CH2+CC)	R	'Bottom element
GW	42	1	CH2	D2	H-(CH2+CC)	CH2+CC	D2	H-CH2	R	'Bottom right chamfer
GW	43	9	CH2+CC	D2	H-CH2	CH2+CC	D2	H+CH2-CC	R	'Right side
GW	44	1	CH2+CC	D2	H+CH2-CC	CH2	D2	H+CH2	R	'Top right chamfer
GW	45	9	CH2	D2	H+CH2	-CH2	D2	H+CH2	R	'Top element
GW	46	1	-CH2	D2	H+CH2	-(CH2+CC)	D2	H+CH2-CC	R	'Top left chamfer
GW	47	9	-(CH2+CC)	D2	H+CH2-CC	-(CH2+CC)	D2	H-CH2	R	'Left side
GW	48	1	-(CH2+CC)	D2	H-CH2	-CH2	D2	H-(CH2+CC)	R	'Bottom left chamfer
GW	51	9	-CH3	D3	H-(CH3+CC)	CH3	D3	H-(CH3+CC)	R	'Bottom element
GW	52	1	CH3	D3	H-(CH3+CC)	CH3+CC	D3	H-CH3	R	'Bottom right chamfer
GW	53	9	CH3+CC	D3	H-CH3	CH3+CC	D3	H+CH3-CC	R	'Right side
GW	54	1	CH3+CC	D3	H+CH3-CC	CH3	D3	H+CH3	R	'Top right chamfer
GW	55	9	CH3	D3	H+CH3	-CH3	D3	H+CH3	R	'Top element
GW	56	1	-CH3	D3	H+CH3	-(CH3+CC)	D3	H+CH3-CC	R	'Top left chamfer
GW	57	9	-(CH3+CC)	D3	H+CH3-CC	-(CH3+CC)	D3	H-CH3	R	'Left side
GW	58	1	-(CH3+CC)	D3	H-CH3	-CH3	D3	H-(CH3+CC)	R	'Bottom left chamfer
GE	0
LD	5	0	0	0	58000000
GN	-1
EK
EX	0	1	5	0	1	0	0
FR	0	0	0	0	145.0	0
EN