[Palmyweather]

I noted that there is only one hole for the SMA connector on the top of the box, perhaps because you are not using the "relay data" functions and haven't installed the second antenna.

A hint, that can be useful for everybody: Even if you don't intend to use the "relay data" function, always install the two SMA connectors, preferably the long versions. The long versions of the SMA connectors, allows you to firmly hold your board to one side of the box (rear or top panel).

This is a very good point. I am only using one SMA connector because I am not using any relay boards. However, by using two SMA connectors, it would give much better stability to the circuit board, and prevent any twisting of the circuit board and extra strain on the RX SMA connector when plugging in the USB and power cables.