[Nascarken]

Originally Posted by ADTech

Most likely the noise is radiated and is being picked up by the antenna rather than the coaxial feedline. The ferrites on your coax cable will likely neither help nor hurt. Ditto for a shielded power cable for the "various power supplies". If those devices were appropriately tested for FCC Part B compliance, they would have been tested for both radiated and conducted emissions.

So what's a little noise