Wouldn't overtones, etc. come into play?

Your primary RF freq would not necessarily be in the 2.4mHz band, but a lower primary may produce a resonance overtone smack in the middle... Granted that the likeyhood is not all that great of this happening, but given a LOT of RF noise couldn't it?

On 72Mhz I've had engines send my RX nuts when the engine hit a specific RPM range, and there is no way that the engine would be rotating at the same 72mHz rate... yet even with filtering my radio was still overpowered by the engine.