I am gathering info and material for my home-brew ATU. The design I am using recommends to use Teflon wire in the autotransformer toroid converting the 50 ohms to 12.5 ohms. It uses 14 gauge wire for “high power 1kW” coupler. I am going for 100 to 250 W. I am trying to find out what would be the advantage of using Teflon, especially when from experience I know it is not that easy to work with and string thru even 2 inch toroid and is relatively hard to find in small quantity. The electrical properties may have something to do with it, but I am really not in favor to use “an exotic” part just because it has .01 db less loss than using other insulation. Any to the point commentaries are as always appreciated and welcome.