CM Square halo for 20m, based on https://www.pa9x.com/how-to-build-10-and-20-meter-band-square-halo-antenna/
CM Modelled by Roger Walker, GW6HRU
CE
SY Y=2.5
SY X=6
SY G=0.25 'Gap between looped ends
SY H=1.5 'Height above Ground
SY T=0.1 'Gap between turns
SY R=0.001 'Wire radius
SY GH=G/2
SY HY=Y/2
SY HX=X/2
GW 1 19 -HX -HY H HX -HY H R
GW 10 10 HX -HY H HX HY H R
GW 11 9 HX HY H GH HY H R
GW 12 1 GH HY H GH HY H+T R
GW 13 9 GH HY H+T HX HY H+T R
GW 14 10 HX HY H+T HX -HY H+T R
GW 20 19 HX -HY H+T -HX -HY H+T R
GW 21 10 -HX -HY H+T -HX HY H+T R
GW 22 9 -HX HY H+T -GH HY H+T R
GW 23 1 -GH HY H+T -GH HY H+2*T R
GW 24 9 -GH HY H+2*T -HX HY H+2*T R
GW 25 10 -HX HY H+2*T -HX -HY H+2*T R
GW 26 10 -HX -HY H+2*T HX -HY H+2*T R
GW 30 10 HX -HY H+2*T HX HY H+2*T R
GW 31 9 HX HY H+2*T GH HY H+2*T R
GW 32 1 GH HY H+2*T GH HY H+3*T R
GW 33 9 GH HY H+3*T HX HY H+3*T R
GW 34 10 HX HY H+3*T HX -HY H+3*T R
GW 40 19 HX -HY H+3*T -HX -HY H+3*T R
GW 41 10 -HX -HY H+3*T -HX HY H+3*T R
GW 42 9 -HX HY H+3*T 0 HY H+3*T R
GW 43 1 0 HY H+3*T 0 HY H R
GW 44 10 0 HY H -HX HY H R
GW 45 10 -HX HY H -HX -HY H R
GE 0
LD 5 0 0 0 58000000
GN -1
EK
EX 0 1 10 0 1 0 0
FR 0 0 0 0 7.05 0
EN