A read-only CwrFixedPointValue, in dBm, giving the lowest receive power measured at the main antenna during the current operational hour, not a cumulative statistic. It captures the worst moment the main antenna experienced over the whole hour, often the point most closely tied to that hour's severely errored or sync-loss seconds. For example, a very low p2mpSu1HrMainAntRxPowerMin during an hour that also shows elevated p2mpSu1HrSevErroredSeconds points to a specific deep fade event as the likely cause of that hour's impairment.