This read-only octet string holds a rolling per-hour history of the weakest RSSI value observed in each of the last 72 hours. An admin uses this longer-term history to identify daily or multi-day patterns of degraded cellular signal, such as consistently poor coverage during certain hours, without needing continuous external monitoring. For example, if a remote site experiences unexplained slowdowns each evening, the admin can check this 72-hour history to see if the weakest hourly RSSI reliably dips at that time, pointing to a recurring RF or congestion issue.