I have read that in several ham antenna sites, but mine has been
in use and outside for at least 4 years. Last spring a lightning bolt
took out an Chineese Elm tree about 30' from the "long" wire feeding
it. When the tree fell it took the wire antenna, and our fence, with
it. I
was concerend about the transformer and was mildly shocked to find
it unscathed.
Somewhere I have a link for a "multi-set coupler" that disusses the
commercial and roll your owns and mentions the techniques used by
mincircuits give a "flatter wider bandwidth with less loss". The last
line
is a parphrase of their conclusion. It isn't that we can't wind good
low
loss, wide bandwidth transformers, to me being able to buy one for a
few (my 9:1 cast less then $4 US) dollars will help get the project
done
that much faster. And in a situation where a JFET amplifier is under
consideration, I supect that the FETS will get fried many more times
the the tranformer.

Terry