Just for fun I have ordered one of these 1:9 baluns for a test.
Won't be here until next year though.
It's a cheaper version, so I'm not sure if it's gonna be much good, but what the heck, it's only $4 !
I've noticed that on all the versions I have seen, the appear to have a varistor across the input.
I guess that'll have to be removed.
73 de Andy