Amazon.com: Balun One Nine v2 Barebones - Small Low-Cost 9:1 (1:9) HF Antenna Balun and Unun with Antenna Input Protection for Shortwave. Great for Software Defined Radio (RTL-SDR), Ham It Up &
1:9 UnUn 600 Watt DIY Kit 1.8 - 30 MHz - HF kits
Random Wire (EFLW) Antenna Designs - Southern Peninsula Amateur Radio Club
Balun 1:9 problem : r/HamRadio
Nooelec - Balun One Nine v2 - Small Low-Cost 9:1 HF Antenna Balun/Unun with Aluminum Enclosure & Multiple Connection Options