My local area has had a recent flood of new 2.4GHz wireless access points.
All of the channels are completely crowded, some of our home laptops don't
detect the Wi-Fi at all.
However, no one is using any of the 5GHz channels, so I'm wanting to try and
migrate to 5GHz to try and stabilise
Would this do? It has the AR9380:
https://www.ebay.co.uk/itm/Atheros-Dual-Band-Mini-PCIE-Full-Size-Wireless-WiFi-Card-AR5BXB112-AR9380-W040/302024942290?epid=6004057245=item465216e2d2:g:RksAAOSwDrNZUCRg
Though, it has three antenna connectors which is unusual.
It does have the same chipset, I'm just being pedantic/paranoid. I can
confirm that I purchased that card from the eBay listing. It works like a
charm and is 5GHz compatible. Thanks for pointing me to ath9k page.
Bought this card:
https://www.ebay.co.uk/itm/Atheros-Dual-Band-Mini-PCIE-Full-Size-Wireless-WiFi-Card-AR5BXB112-AR9380-W040/302024942290?epid=6004057245=item465216e2d2:g:RksAAOSwDrNZUCRg
Confirmed working with Trisquel and Parabola and it does work with 5GHz.