Local network wifi transfer rate (pathetic..)

Trying to transfer large files across the local network, using wifi (brick house, ethernet not possible).
One end using AC1200 dongle, other end (Ubuntu 24.04) ethernet to the router, (TP-Link M5 AC1300 mesh.)
Have tried scp/rsync/Warpinator, and generally the speed is about 1.3mb/s - about 3.5 hours for a 14.5gb file…
No, I don’t have a clue, thus the question…
Can this be improved? I would think so??

Thanks.