And to help those who want to try...
I will release the scheme of my amplifier on 57 Khz of the FM\RDS signal for split signal with FM antenna of the car.
Use SMD miniaturized components (as I did) and design your double size PCB with a large area of GND...
Note:
this was designed for my original BMW FM diversity antenna.
Spoiler: Schematic of FM antenna amplifier
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