Frequency Emissions Detector
The detector uses a biased Schottky diode for excellent sensitivity and bandwidth; the detector will detect signals from below the AM broadcast band up to the microwave band
At least RCPI seems to be well defined, and I think we can add it to radiotap for those drivers that can reliably compute this value. Quoting from Simon's post: "The allowed values for the Received Channel Power Indicator (RCPI) parameter shall be an 8