Hi, I am building a 10 to 80 meter inverted V antenna and I want to run RG-8X to the feed point. I hear I should use a 1 to 1 balun. I can make one using 18 feet of RG-8X I have in the shack. Do I need more than 18 feet and what diameter should the coil be at the feed point. I will be using 24 gauge stranded/coated wire and up 40 feet.