At what range can I transmit with this antenna?
Although this is labeled an &quot;antenna&quot;, it's really an RFID coil, like you see in those pedestals surrounding a store entrance. RFID systems operate in the &quot;near field&quot; which extends at most a few coil diameters away. It will not radiate efficiently enough to send a signal to a distant location at the 125 kHz frequency. It takes something more like this :)