Comment Re:... for a given antenna and receiver sensitivit (Score 3, Informative) 35
Yes, but e.g. ISO 14443 RFID passive responses (e.g. the ones used in ICAO-specified RFID passports and paypass cards) very quickly go below ambient background noise, in effect limiting even the theoretical range to 1-2 m for all but most exotic radio-noise free environments.
Passive RFID is only half-radio, really.