This RFID reader was developed specifically for Bingo blower, to read ball codes. It has three coils, arranged in three planes, which are perpendicular to each other.
The antenna is coiled on the grooves of the acrylic tube. The ball with built-in RFID tag is in the center, which is the best possible position for reading. There is only one reader, and one by one coil is selected by the analog switch.