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The GC1109 FEM needs its VFEM_Ctrl pin held HIGH during deep sleep to keep the LNA active, enabling proper RX sensitivity for wake-on-packet. Without this, the LNA is unpowered during sleep and RX wake sensitivity is degraded by ~17dB. Release RTC holds in begin() after configuring GPIO registers (not before) to ensure glitch-free pin transitions on wake. Trade-off: ~6.5mA additional sleep current for significantly improved wake-on-packet range.