Jpole antenna using a TV balun, avoid feedline radiation

[Findm-Keepm]

I was taught in Channel Master's CATV/MATV school that most 75/300 ohm baluns are actually 72/300 ohm - that they were designed to match the natural impedance of some antenna, I've forgotten which one - dipole?. The older CM 8281 baluns (75 - 300/300) for coax/F to VHF/UHF 300 were listed in the catalog as 72 ohms initially, but Winegard, Finco and Blonder-Tongue all used 75, so the assimilated.

So I guess any mismatch is even lower if they are indeed 72 ohm....