CM 144 MHz Single Cebik Wheel Antenna at 0.5 lambda NEC model by Carol F. Milazzo, KP4MD CM Horizontal orientation (using GH command) CM Frequency = 145.000 MHz CM 29 segments per element CM Simulated good ground CM http://www.qsl.net/kp4md/omnihoriz.htm CE SY frq=145 'Input frequency MHz SY len=31.55469 'Input element length inches SY dia=0.5 'Input element wire dia. inches SY rad=0.5*dia 'Calculate element wire radius SY n=29 'Input segments per element (must be odd) SY nc=0.5*(n+1) 'Calculate feed point segment SY cir=97.34283 'Input wheel circumference inches SY r=0.5*cir/3.1415926 'Calculate wheel radius SY h=40.87 'Input height inches to 0.5 lambda GH 1 n 1e-300 1e-300*(len/cir) r r r r rad 'First element GM 1 2 0 0 120 0 0 0 0 'Complete the wheel GM 0 0 0 0 0 0 0 h 1 'Raise antenna to 0.5 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 nc 0 1 0 0 'Feed point EX 0 2 nc 0 1 0 0 'Feed point EX 0 3 nc 0 1 0 0 'Feed point FR 0 0 0 0 frq 0 EN