CM 144 MHz Stacked Eggbeater Antenna NEC model by Carol F. Milazzo, KP4MD CM Vertical orientation (using GH command) CM Frequency = 145.000 MHz CM 42-side polygon loops CM Simulated good ground CM http://www.qsl.net/kp4md/omnihoriz.htm CE SY frq=145 'Input frequency MHz SY d=29.01591 'Input loop diameter inches SY r=0.5*d 'Calculate loop radius SY dia=0.5 'Input loop wire dia. inches SY rad=0.5*dia 'Calculate loop wire radius SY n=42 'Input n-polygon loop SY h=40.66136 'Input height inches to 0.5 lambda GH 1 n 1e-300 1e-300 r r r r rad 'Form first loop in ground GM 0 0 90 90-180/n 0 0 0 h 0 'Raise loop center to 0.5 lambda and rotate to orient vertically GM 1 1 0 0 90 0 0 .25 1 'Rotate loop 90 degrees to form second loop GM 2 1 0 0 0 0 0 h 1 'Copy to second set of loops at 1.0 lambda GS 0 0 0.0254 GE 1 LD 5 0 0 0 58000000 '0.5 inch copper tubing GN 2 0 0 0 4 0.01 EK EX 0 1 n 0 0 1 0 'Feed point EX 0 2 n 0 -1 0 0 'Feed point EX 0 3 n 0 0 1 0 'Feed point EX 0 4 n 0 -1 0 0 'Feed point FR 0 0 0 0 frq 0 EN