Leaderboard

No reason why you would, must be something else... Make sure you don't use any add-on Atheros kexts like you had initially in your kexts folder.

Cards based on Broadcom BCM4313 chip are unsupported so those go out of the way and other cards based on BCM431x chips were dropped from Sierra; so these are out of the way too. That leaves you with the Atheros cards but you're highly likely to encounter troubles with the AR5B225 because it's poorly supported and so, I don't recommend this at all. Out of the 4 x cards of your list, I could only advise to go for the AR5BHB92, which also happens to work OOB.

@catmater Take a look at this link for WiFi: I would suggest you to get Broadcom BCM4352 card for good support. I will take a look at your files later today and see whats wrong.