Amazon.com: Balun One Nine v1 - Tiny Low-Cost 1:9 HF Antenna Balun and Unun with Antenna Input Protection for Ham It Up, RTL-SDR, HackRF and Other HF-Capable Radios. Great for DIY Dipole
Unun 9:1
Copy of Balun 9:1
1:1, 9:1, 49:1 Matching Units - What's the difference? - YouTube
Construction of a 9-1 unun - YouTube
50:450 ohm (9:1) Balun or Unun Core Kit, 1.8-30 MHz, 250 watts PEP, end fed, T2FD antenna - Common Mode Noise Filter - Coax - Palomar Engineers®
9:1 Impedance Transformer | Get out of the Radio Shack and Live Life
1:9 UnUn 600 Watt DIY Kit 1.8 - 30 MHz - HF kits
Ham radio ON7IR: 9:1 balun and unun
50:450 Ohm (9:1) Balun for vertical antennas - The DXZone.com