I'm following AG4RQ's plans for a coil loaded 40-10 dipole. The antenna is made from 66' of #18 wire, 33' on each side with 27' of that wound into a coil on each end. It says to use 450 Ohm ladder line from the feedpoint all the way to the tuner. I don't have any ladder line at the moment, I only have 300 Ohm insulated TV twin lead or 50 ohm coax to feed it. My tuner is built into the my radio which is a Kenwood TS-590. Is it possible to use my twin lead or coax to feed it and what alterations would I need to do? I am still trying to understand antenna theory so all info is welcome.