Impedance measurement for my new dipole for the 15m band.
gnuplot> load "gnuplot.txt"
Freq [MHz]=21.03
V1=1.6
V2=2.0
Cursor 1=-4.5e-09
Cursor 2=0.0
vratio=1.25
phase1 [deg]=-34.0686
phase2 [deg]=0.0
abs(gamma)=0.70112862738752
swr=5.69184198713212
cz={17.8937141914241, -49.2890662925202}
My power meter says that Pfwd=10.0W and Pref=4.0W, which means SWR=4.4.
Vref=sqrt(4.0/10.0)=0.6324 SWR=(1.0+0.6324)/(1.0-0.6234)=4.4
Considering the cable length of 20m, Zant=280.884+j31.809.