MFJ-912: Use the MFJ 912 to match your open wire, ladder line or balanced line feeders to coax.
Use coax from your antenna tuner to the MFJ-912 which can be mounted outside ( additional weatherproofing needed).
Giant 2-core 4:1 balun wound with Teflon wire connects to high voltage ceramic feed through insulators. The MFJ-912 4:1 balun will handle the full legal limit ( or more! ) with ease.
Fitted with SO-239 connector.