Local, state-wide and regional coverage: Our FleetNet Digital Radio Network uses the NXDN protocol. This is a widely supported open standard Common Air Interface (CAI) for mobile communications. As well as providing wider coverage, FleetNet delivers clear voice quality even over potentially unreliable communications channels and in the noisiest environments. RF signal strength weakens with distance, which is why analog reception becomes increasingly noisy and intermittent. A digital NXDN signal is audible at a greater range than is possible with an analog signal. The low Bit Error Rate (BER) of NXDN also improves reception even in fringe areas. Coverage is expanded by as much as 20% over FM analog, resulting in a 50% increase in the coverage area for digital 6.25 kHz. NXDN digital can recover audio from a weak signal by analyzing the transmission and filling in the missing pieces with the use of Forward Error Correction (FEC), further extending range.