Could use help with RTL8821AE

Hi, I have this pci card in an Espressobin. lspci says

00:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter

I'm on OpenWRT 18.06.5, aarch64

I've tried randomly installing modules that say RTL8821AE or mac80211, but it hasn't worked so far.

Where in the Wiki should I look? Or, which firmwares and kmods should I use?

A couple times I've got the thing stuck in a boot loop, so it's kind of a pain to experiment.

Tried on 19, and it at least doesn't panic when I scan and it found all the nearby SSIDs, but I ran into some trouble with dependencies trying to install hostapd or whatever.

What's the process for getting newer wifi modules/drivers built? Should I use image-builder, or do I need full buildroot? Can I base it off 18, or do I need to use 19 for kernel reasons?