Passport RFID reading demonstrated from 217 feet at BlackHat 2010 with just $2500 worth of eBay gear: <a href="http:&#x2F;&#x2F;www.networkworld.com&#x2F;article&#x2F;2215057&#x2F;wireless&#x2F;bad-guys-could-read-rfid-passports-at-217-feet--maybe-a-lot-more.html" rel="nofollow">http:&#x2F;&#x2F;www.networkworld.com&#x2F;article&#x2F;2215057&#x2F;wireless&#x2F;bad-guy...</a><p>The guy reckons 2 miles is theoretically possible with HAM radio-operator-legal transmit power (1.5kW) and the right antennas.