RAK3172 Antenna suggestion

I have some modules RAK3172 with the IPEX connector.
Do you have any suggestion for an external or PCB antenna ?

Welcome to RAK forum @lorawanAdapter ,

For quick evaluation and low-cost, you can use this antenna. Take note that antenna like this is highly affected by its surrounding materials.

For better performance, you need balanced type antenna like the following:

You need to get to get the IPEX to RP-SMA connector as well to use these antennas.

Lastly, dont forget to select the right frequency of operation.