This is OCF antenna also known as Windom antenna fed at 19% of one end. Current type 4:1 (200:50 Ohms) BALUN is another product designed for OCF antennas (Off Center Fed) also known as Windom antenna. Dual cores, total of two (2) 2.4 inch (61mm) wound with PTFE  wire is the best CURRENT  BALUN design used with … Continue reading OCF-8010E-3K OCF Antenna Windom 80/40/30/20/15/12/10m