Transmission line maximum impedance Please consider that transmission lines theory leading to Zo formula is based on the assumption that no radiation occurs: that condition is only true when the distance between conductors is very smaller than the signal wavelength. Besides Zo function versus height is a logarithmic law, so increasing weakly at height increasing. For example, having 0.04 inch conductor diameter and εr=1 it is necessary a height of about 5.5 inch to have Zo = 377 Ohm…