This experiment I performed 5 years ago in Feb 2017. I cant find those dummy load resistors now.
At that time the purpose of this experiment was to demonstrate that impedance of a load (antenna) seen at other end of coax varies with length of coax, which the experiment demonstrated successfully.
As the experiment was not intended to determine precise values of mesured impedance across coax vs directly measured value, I did not bother to measure dummy load’s value by a multimeter.