This EDUP USB WiFi Adapter is excellent at $7

My Realtek didn't work and I didn't really want to do all the stuff to try to get it working. It did show up running the lsusb command.

The EDUP is 2.4GHz only but after a certain distance, 5GHz isn't an advantage. It's coverage and speed are excellent. Getting 50mbps from the other side of the house, which is no less than I would get at 5GHz. 3 out of 4 bars, solid (sometimes 4). Plug and play. Mediatek chip.

The antenna doesn't swivel but in my experience, there is no diff between vertical and horizontal placement. Mine is horizontal.