What is Reddit's opinion of U.FL to SMA M.2 NGFF UFL to SMA Female MHF4 IPX4 IPEX4 Ipex Connector Pigtail WiFi Antenna Extension Cable (10 inch (2 Pcs))?

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No I don’t have any links but I would personally recommend the BCM94360CS over the BCM94360CS2 because it has 3 antennas opposed to 2, one of which is dedicated to bluetooth. You could also get the BCM94360CD which has 4 antennas but I think it’s a bit more expensive. Try looking around on ebay cause its probably gonna be cheaper than amazon. I bought a used one a few months ago for $6 and it’s still going strong. As for the adapter card that should work, but you’ll also probably want to get a new set of wifi antenna extension cables like this since the ones that come with the motherboard are too short.

That's the exact converter that I bought. I used the F_USB extension cable to hook up the leads for the USB connector.

And that is the correct antenna too, the initial one I bought was for a mini PCIe card, so I ordered this one:

https://www.amazon.com/gp/product/B087C7DZK7/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Although I bought this wifi card instead: https://www.amazon.com/gp/product/B083YXS7VF/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1

Initially, bluetooth didn't work, but then it started after a restart.

Airdrop isn't working.

I haven't removed the Intel wifi card yet, so I'm not sure if that's causing an issue.

Good luck mate.