I’m not sure.
But consider, everything what I was doing with the Router-Board was a own Projekt.
Two additional holes in a metal case may not be the smallest worktime you have to invest:
Yes, you can check the signal strange with openwrt.
I would check it with and without case.
Signal Strange also depends on the distance to the next radio tower.
But Software setup was/is for me not made within a day (starts by choosing the right modem → with/without sim card). If you do not want your Life more difficult use antennas. You do not even have to do the holes. After you get a connection you can start to reduce.
Thanks for your reply! But I think you answered in the wrong thread.
I plan to drill a hole in the metal case of the BPI R3 next to the other SMA connectors. I’ve seen images of some LTE routers with a single antenna. It’s not easy because I don’t know anything. I’m going to order an RF cable Microcoax 1,13mm 0,2m SMA F B/H Au / U.FL, plus an external cellular 4G/5G magnetic SMA male antenna.