Although I have never used these, they seem a good idea. As I understand it, interference and RF can travel back to the rig on the coax outer. In some cases this can mess up the SWR reading, add to RX noise and cause RF burns. So the idea is to choke off these with a line isolator. Presumably clip on ferrite beads might make a difference. The basic idea is to choke off RF currents flowing on the coax outer whilst leaving the inner untouched.
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