common mode filter
Since the inductive coupling is around the coax, you are interacting with common mode signals. The best you can hope for is the same effect as clamping an EMI ferrite around the coax. The circuit is a random connection of parts and will serve no real purpose. In fact, if you are near a transmitter, the diode in your circuit will generate harmonics of that transmitter. If there are several transmitters you will get all of the IMD products and ruin radio andt TV reception for receivers near you. The coaxouter conductor will act like a long wire antenna.