A radio frequency identification (RFID) tag positioning system includes a tag holder having a first region with a slot extending from an edge of the first region, and a second region extending from the first region. When an RFID tag having an antenna is disposed in the slot of the tag holder and when the tag holder is adapted to be retained adjacent a filling fixture of a gas tank with the second region adapted to be in contact with the gas tank so that the slot is approximately perpendicular to a longitudinal axis of the gas tank, the RFID tag's antenna is approximately perpendicular to the longitudinal axis of the gas tank.