Ian Jackson wrote:

As to the efficacy of 9:1 un-uns, the augment in their favour is that
over the HF spectrum, they give a better match to a typical long wire
over more of range. However, there are relatively narrow parts where the
match is made worse.

In my experince the ability to separate the DC path of the antenna to ground
did far more to improve readabilty than any slight improvment in matching.

This was both with modern (Kenwood R5000 and similar radios) and Drake
SPR-4s.

Geoff.

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Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379