Antenna 9:1 impedance transformer for the RTL-SDR to connect long wire 100k - 50Mhz (BALUN)
An End-Fed 160-10m Long Wire Antenna with a QRO 9:1 Un-un and 1:1 RF Choke Balun – Q82.uk – Antenna Resources by Steve G0UIH – ex Vortex Antenna Systems
9:1 Magnetic Longwire Balun / Unun – M0UKD – Amateur Radio Blog
UNUN 9:1 5 kW för End Fed antennas - Dxsupply.com
Unun 9:1 ferrite V3
Unun 9:1
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
The 9:1 balun - The DXZone.com
50:450 Ohm (9:1) Balun for vertical antennas - The DXZone.com
Long Wire Antenna 1:9 Balun for 3-50 MHz (by F4HWK) | Antenna, Ham radio antenna, Ham radio