I was watching the "PBS News Hour" and some "security expert" showed video of someone on a hi-rise roof top with a 6 foot antenna pointed down at the street. He claimed that it was possible to skim RFID tags this way. He did not say what kind of tags could be. I did some searching and can't find anything about long distance credit card RFID skimming (this is the only skimming I worry about) and found nothing. Is there any example and/or claim of successful skimming of current credit card RFID?