Here is my alternative implementation of the Earchi End Fed matchbox + antenna. Earchi web.
The earchi matchbox uses a more widespread trifilar implementation for the unun. The implementation on the betterqrp backpack unun is quite different.
Betterqrp backpacker 9:1 unun - http://betterqrp.com/kits/
30ft of wire - Sotabeams
T1 tuner - Elecraft
EA2BCJ - RG214 MIL low loss coax
|30ft lightweight antenna wire, 9:1 unun, RG214 low loss, T1 auto-tuner|
I am planning to use this antenna on my next activation with the 10m pole as a vertical. A quick test on my garden as a sloper to a 6m pole showed that it loads on 20-30-40m without a problem. During the testing I managed a QSO with RM9I - Asiatic Russia - 5000km
The spade fork connector does not fit well with the balun connector, I will change to a 4mm bannana plug later.