PEP (Primary Entry Point) radio stations are battle-hardened commercial radio stations, usually in the medium wave (AM) band, that serve as initial entry points for national Emergency Alert System traffic. In a widespread disaster situation they could be vital information sources if local infrastructure is down.
Blue indicates legacy PEPs with FEMA generators and fuel systems. Yellow indicates no FEMA generator or fuel system as-yet. Red indicates sites that are completely modernized with HEMP (High-altitude Electromagnetic Pulse) protection.
The 50,000 Watt Blowtorch of the Great Southwest (The History of WBAP)
IPAWS - Integrated Public Alert & Warning System