Hello Pfirepfox,I spent the last few days setting up 4G on my OpnSense machine. There is built-in signal strength metering available (at least with my Huawei E3372h USB 4G modem). Signal strength in the real world is measured using RSSI. If you go to Reporting -> Health there should be a tab called Cellular which shows a graph of the RSSI.RSSI shown is using the scale that is retrieved using AT commands to the modem. These are not the absolute RSSI numbers. For an overview of RSSI values see https://m2msupport.net/m2msupport/atcsq-signal-quality/Hope this helps.