Fiberglass airplane?
What kind of coax?
What kind of antenna?
I just dealt with this on an ES with a Chelton EAU. Same principles though.
I used ferrites on the antenna coax and put ferrites on the cables going to the engine monitor. I also visually inspected the coax for breaks or chafes to allow RF leakage.
Also separate the cables physically as much as possible behind the panel.
Jon

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