Yes, stock antenna and ant2 enabled on archlinux, it seems to also be ant2 on the current image according to the boot config.
I had a download speed of 3-5 mb/s on Archlinux.
With the current image, I am getting around 20-200 kb/s.
I seemed to have been using iwd on archlinux,
perhaps I ought to try to switch over to that.
See: ArchLinux minimal image with RPi 6.6.y kernel for uConsole with CM3/CM4/CM4S - #80 by Disponante
The reason for the switch is that ALARM (Archlinux ARM)
seems dead. Moonlight-qt seems to work great on this image though, seems to be decoding just fine, getting good speeds on my wifi usb dongle.