Hi @jsmedley, we recommend the chipset RT5572.
Last month my teammate made a research about 5GHz USB adapters. Let me paraphrase and share his summary.
According to this article most manufacturers don’t count Linux as one of the supported OSs. There are some exceptions but those apply to 2,4GHz.
Here is explained why is finding a USB Wifi Device for Linux difficult. The summary of it all is that USB Wifi Device producers don’t put the same chipset in one branded product. For example the Panda PAU05 300Mbps can be found with two different chipsets:
- RT5372
- RT2870
The RT5572 is a known chipset which has Linux kernel support. The problem is that this chipset is old and there seem to be a few devices with this chipset available on the market. In this wikidev there are all the devices which have the RT5572 chipset. The Panda Wireless PAU09 N600 is the newest one (est. launched in 2016).
Let us know how it goes with your setup.