Hackaday

It only seems practical for certain receive antennas that already require an impedance matching transformer.

For most uses, RG-6 would be a better choice if you want cheap transmission line. It can easily handle 100 watts as long as you don't use F connectors. For a single band antenna, the coax can be cut to a multiple of a half wavelength and there will be no impedance matching required if the antenna is 50Ω.