Hi, I have a question relating to RFID antennas... For inductively coupled RFID systems, the max. range is about 1.4 times the diameter of the sender antenna (for a loop antenna). In low frequency systems (125, 134 kHz) the antenna coil is often wounded around a ferrite rod, making the antennas more directional, and improving range in the main lobe direction. I have not seen any examples of this kind of antennas in high frequency systems (13.56 MHz). Does anyone know if it is technically possible with ferrite rod antennas in 13.56 MHz systems? best regards, t.