The famous K6ARK end fed matching unit design, now with a bigger toroid and SO-239 connector, ready for your 100W portable rig. Build yourself a highly portable end fed half wave antenna, random wire, bobtail curtain, or half square, and build the matching unit out of this kit. Fully capable of handling 100W SSB, CW, FT8 and other digital modes. The toroid in this unit is specially selected for efficiency and power handling. The toroid is a Fair-Rite model, and is the same diameter as an FT140-43, 2x the height, and 3x the mass. NOTE: This unit is not weather sealed and is intended for temporary outdoor installation and portable operations. Find detailed build instructions at K6ARK.com