You have to be careful no matter what you use. I had a temporary run of W7FG 16awg OWL that came away from one of it's supports and got to within 2" of a pine knot in a 6X6 support under my river house. During an old buzzard transmission, I kept noticing my Antenna Current changing on one side of my LCT so I would adjust it to compensate while I was talking. When I was finishing the transmission, I made the comment I was going to go inspect the antenna system due to the weirdness I was seeing on the meter. Good thing, the 6X6 was on fire and I had to put it out. From what I can tell, the voltage jumped a 2" gap from the OWL to the Pine Knot to ground potential, then must have held a sustained arc burning up the end of the melted wire until I unkeyed. I build all of my own crappy feedline now.