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I wouldn't hold out hope for an easier out of the box wifi antenna. If you want a U.FL antenna for the built-in wifi, there has to be a physical switch (cost, fragility) or a built-in antenna connected to U.FL you can replace (same issues) or the same cut and solder pattern for wifi antennas across chips like ESPs, nRFs, and others.

Just use a USB adapter with a decent antenna.

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> there has to be a physical switch

Or literally any $1-3 SPDT RF switch? >80% of which are directly optimized and advertised for wifi and bluetooth?

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For a Zero, that’s a big BoM item given this would be used by relatively few people.
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Yeah, western parts are expensive.

https://www.lcsc.com/product-detail/C47117600.html

Here's a capable switch for $0.07.

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There are RF connectors by Hirose which are bypassable due to a built-in switch, but I don't think pigtails with them are common.
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Yeah I find the Pi's of that era have pretty poor wifi reception, has been a constant source of uncertainty when I run things on them sadly
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