The DiRaBox has already an integrated remote power supply & 470 ohms series resistor (see right side of the dashed line). This allows the connection of this simple active antenna circuit:
Simple active antenna (PDF-file)
The supply voltage is fed through the coax cable. The receiving range lasts from AM to FM (0.5 - 100MHz). Below 500KHz only reduced reception is possible.
Components:
1x BNC socket
1x Resistor 100K (1/16W)
1x Transistor BF494 or BF199
1x 30-50cm isolated wire (radiating element)
