The DUT is my dipole antenna for 17m band, including the coax cable of about 20m length.
The voltage ratio V2/V1, using CH1 for both measurement, is 4.624 [V] / 2.895 [V] = 1.597, and the phase difference is +3.60 [nS] / 55.25 [nS] * 360.0 = +23.46 [deg].
(%i1) Vs:1.0+%i*0.0;
(%i2) t:(+23.46/360.0)*2.0*%pi;
(%i3) s:1.597/2;
(%i4) V2:s*(cos(t)+%i*sin(t));
(%i5) Vr:Vs-V2;
(%i6) z:50.0*(V2/Vr);
(%i7) float(realpart(z));
(%o7) 27.48700095398715
(%i8) float(imagpart(z));
(%o8) 92.08160857471663
(%i9) float(realpart(z)/50.0);
(%o9) 0.54974001907974
(%i10) float(imagpart(z)/50.0);
(%o10) 1.841632171494333
(%i1) zl:z/50.0;
(%i2) g:(zl-1)/(zl+1);
(%i3) float(abs(g));
(%o3) 0.78767422999205
(%i4) VSWR:(1+abs(g))/(1-abs(g));
(%i5) float(VSWR);
(%o6) 8.419487798985081
