These can be 300 ohm TV lead, the length being exactly as determined for the quarter wave transformer. Or you can use ladder line, like mine. The ladder line length came out to 53 inches, since it has a higher VF than TV twinlead. The bottoms are shorted and left to hang as is. Hot melt and paint everything.
Fat wire has advantages in lowering the Q of the antenna.
This makes it a little more broadband than small wire sizes. The whole thing is about 37 feet long. I have spent 3 evenings working 6 M openings with it. Everybody I could hear, I could work, and we exchanged similar reports. Most of the hams I worked were using beams.