I'm still using the stock antenna. I know something like a tiger tail might work, but I don't have a VNA to test. Improved antennas inbound.
****** Update 1/5/2024 **********
Ugh, I made an error. Meshtastic has Channels which are really group chats, not frequencies. I used the default Channel, but the LoRa has frequency channels. Both have to match and mine didn't. I'll have to redo my drive.