I used to run a schottky diode as well as caps to suppress motor noise back in the brushed days, also not that not only the motors produce noise but the ESCs and the motor wires too, so get your RX and aerial as far away from them as possible.
A vertical aerial outside the boat helps a lot too.
I went 2.4ghz after I went brushless so I could be wrong, but I was under the impression that 2.4ghz was so much higher frequency than motor noise that it was no longer an issue, what 2.4 do you have?
Paul Upton-Taylor, Greased Weasel Racing.
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