I use a home made EARCHI Unun. The toroid is an FT50-43. The enamelled wire is 0.3 mm.
The feeder is a 8m long (aprox 22 feet) RG-174.
The antenna wire is a 0.3mm² (approx. 22awg) from Sotabeams.
It was used as a long wire as an L, sloper or horizontal.
The wire is rolled in a wire winder and the length (random) is adjusted to fit the available space. Started as a 41m long (134.5 feet aprox) but after 100+ activations it's shorter (some tree entanglement...).
The results are awesome!
Some QSOs with VK and ZL been almost usual across the pond.
I had use it with KX-1, KX-2 and KX-3 (all with ATU).