1:1 Current Choke Balun Line Isolator

Our most effective 1:1 balun. Also known as a choke balun, line isolator, and other names.
Better than 25 dB attenuation of common mode current across the HF and 6M bands.

To reduce noise on receive, place one at the transceiver end of the feedline.
To reduce transmitted RFI in the shack, place another one at the feedpoint of dipole and other doublet-type antennas.

For optimum results put one at each end of your coax.