Good catch on the 9:1 issue, Michael.
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Thinking of some potentially field expedient solutions:
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If you have tuner with you, perhaps treat it like a “random” wire with the 9:1 unun.
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If no tuner, maybe take your EFHW and feed in the center as a half-wave dipole?
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If all else fails, and depending on where you’re traveling, maybe visit one of the ham radio stores for parts or a different antenna solution. I think ML&S is near London, Heathrow and Waters & Stanton is in the Milton Keynes area.
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73 de W6CSN
https://w6csn.blog/2024/06/19/uk-pota-rain-and-shine/
