FM Broadcast sender boards are illegal to operate in most countries of the world (unless you are a licensed public broadcast station).
They are still produced and in use to interface audio input devices such as MP3 players or smartphones with car radios that have no auxiliary audio input.
Due to the very low RF emission of such breakout boards, chances of interference are minimal, and the reach of these devices is just a few meters.
Regardless, operating such devices is illegal in most countries, and certainly in the EU.
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(content created Apr 19, 2024)