I've successfully used air-wound coil choke "baluns" on 11-meters. Five
feet or so of coax wound on a small peanut butter jar (plastic), secured
with zip-ties and black electrical tape. Works quite well.
As you know, that isn't very far from 10- or 12-meters. I've not yet had
an occasion for such a direct field test on the longer bands. At least
none that I recall.
I do agree that ferrite will improve the design. Home made 1:1 current
baluns are easy to make too, which is nice. Jerry Sevick W2FMI has
written several very good books on the subject.
73-Erik Weaver n0ew
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