I want to construct an Unun for my inverted L. It is sitting at 23 ohms, so a 2.25:1 would be ideal. I have a FT-240-K core. Anybody used this core for a topband Unun, is so how many trifilar turns and what size of wire? I was going to try 7 turns #14. Any words of wisdom much appreciated! 73 Gavin GM0GAV