CM Trap dipole for 40 and 80 meters designed by Austin Wright, VE3NCQ
CM 
CM Feel free to build this model, or play with the parameters. 
CM Try increasing the height to obtain a lower angle of radiation for DX.
CM This antenna was built and fed with twin-lead with excellent results on all bands.
CE
SY inner=9.92	'Inner 40m dipole
SY outer=3.0	'Outer wire for 80m
SY trap=.2	'Length of traps
SY L=1.5e-5	'Coil inductance in Henrys  (15uH)
SY C=3.3e-11	'Trap capacitance in Farads  (33pF)
SY cap=.5	'End Cap diameter
SY caploc=inner+trap+outer	'End Cap position (end, but is moveable)
SY ht=8	'Height above ground
GW	1	21	-inner	0	ht	inner	0	ht	#14
GW	2	10	-inner-trap	0	ht	-outer-trap-inner	0	ht	#14
GW	3	10	inner+trap	0	ht	outer+trap+inner	0	ht	#14
GW	4	1	-inner	0	ht	-inner-trap	0	ht	#14
GW	5	1	inner	0	ht	inner+trap	0	ht	#14
GW	14	4	caploc	0	ht	caploc	cap	ht	1mm
GW	15	4	caploc	0	ht	caploc	-cap	ht	1mm
GW	16	4	caploc	0	ht	caploc	0	ht+cap	1mm
GW	17	4	caploc	0	ht	caploc	0	ht-cap	1mm
GW	18	4	-caploc	0	ht	-caploc	cap	ht	1mm
GW	19	4	-caploc	0	ht	-caploc	-cap	ht	1mm
GW	20	4	-caploc	0	ht	-caploc	0	ht+cap	1mm
GW	21	4	-caploc	0	ht	-caploc	0	ht-cap	1mm
GW	22	4	-caploc	0	ht+cap	-caploc	cap	ht	1mm
GW	23	4	-caploc	cap	ht	-caploc	0	ht-cap	1mm
GW	24	4	-caploc	0	ht-cap	-caploc	-cap	ht	1mm
GW	25	4	-caploc	-cap	ht	-caploc	0	ht+cap	1mm
GW	26	4	caploc	0	ht+cap	caploc	cap	ht	1mm
GW	27	4	caploc	cap	ht	caploc	0	ht-cap	1mm
GW	28	4	caploc	0	ht-cap	caploc	-cap	ht	1mm
GW	29	4	caploc	-cap	ht	caploc	0	ht+cap	1mm
GE	1
LD	6	4	0	0	1388	L	C				'40m Trap
LD	6	5	0	0	1388	L	C				'40m Trap
GN	3	0	0	0	13	0.006	'Average Ground
EK
EX	0	1	11	00	1	0			'Feedpoint
FR	0	0	0	0	7.15	0			'Frequency
EN