In the UK the first tests are done with contactless payments based on RFID. According to the specifications eavesdropping on the transaction signals should not be possible from further than 10 centimeters. And predictably radio signals don't follow specifications: At a distance of 45 centimeter the data was received using equipment which could be hid in a backpack in a shopping trolley. Via Contactless cards: data intercepted - Southgate Amateur Radio News