#344: ARRL 49:1 End Fed Halfwave UNUN transformer kit from HFKits - Build and quick bench test

Published at : 18 Dec 2025

Today's video features the ARRL EFHW Antenna Kit by HFKits.com, which is essentially a nice, weatherized 49:1 UNUN Transformer to convert the 2500-3000 ohm end-fed halfwave feedpoint impedance down to approximately 50 ohms. I review how to build/assemble the unit, and run a quick bench test.
The kit is available from the ARRL as well as HFKits. Here are a few links:
ARRL:
Sale page:
http://www.arrl.org/shop/End-Fed-Half-Wave-Antenna-Kit-for-10-15-20-40-Meters/
Instructions:
http://www.arrl.org/end-fed-half-wave-antenna-kit
HFKits.com pages:
https://www.hfkits.com/build-instruction-impedance-transformer-250w-for-end-fed-antennas/
https://www.hfkits.com/product/end-fed-impedance-transformer-250w-diy-kit/