CM 50 MHz Halo Antenna at 118 inches NEC model by Carol F. Milazzo, KP4MD
CM Horizontal orientation (using GH command)
CM Frequency = 50.3 MHz
CM Impedance 50 ohms
CM 26-side polygon (115.6 inch loop with 4.5 inch gap)
CM Simulated good ground
CE
SY frq2=50.3	'frequency MHz
SY cir2=115.6506	'Input loop circumference inches (loop + gap)
SY r2=0.5*cir2/3.1415926	'Calculate loop radius
SY dia2=0.5	'Input loop wire dia. inches
SY rad2=0.5*dia2	'Calculate loop wire radius
SY n2=26*3	'Input n-side polygon of loop + gap
SY h2=118	'Input height to loop inches
SY g2=4.5	'Input gap size in inches
SY gseg2=int(n2*g2/cir2+0.5)	'Calculate gap length in segments
GH	8	n2-gseg2	1e-300	1e-300*(n2-gseg2)/n2	r2	r2	r2	r2	rad2	'Loop build
GM	0	0	0	0	gseg2*180/n2	0	0	h2	8	'50 MHz halo
GS	0	0	0.0254
GE	1
LD	5	0	0	0	37700000	'1/2 inch aluminum tubing
GN	2	0	0	0	4	0.01
EK
EX	0	8	(n2-gseg2)/2	0	1	0	0	'Feed point
FR	0	0	0	0	frq2	0
EN