In a general sense, transmission lines are electrical transmission lines connecting power supply of kilos of volts from the thermal generating station to distributors and consumers. However, there also exist transmission lines, which carry electricity of lower voltage and higher frequencies.
Unfortunately I havent tested the 5G, Only difficult part was connecting antennas. But everything is good, by default it runs on Qualcom's QMI mode, Had to switch to MBIM and it works good with Windows. Planning to run with OpenWRT soon.