This read-only 72-byte octet string holds a per-hour history of the weakest 1xRTT RSSI value recorded in each of the last 72 hours (three days). An admin uses this long-term buffer to identify daily or multi-day patterns in 1xRTT signal degradation, such as consistently worse coverage during certain hours, without needing an external monitoring system polling continuously. For example, this history might reveal that 1xRTT signal reliably weakens every evening, pointing the admin toward time-of-day network congestion rather than a hardware fault.