[gosub100]

They make low power AM transmitters as well. I bought one for my dad so he could "stream" old music from the Internet to his old tube radios.

[dredmorbius]

What's the audio quality of AM transmission?

I've used an FM dongle to play a tablet through car speakers, which works pretty well.

[kanbankaren]

Terrible in one word.

The bandwidth for AM transmissions in North America is only 20 kHz and radio emissions has to STRICTLY fall within that bandwidth. Technically, it allows an audio BW of 10 kHz, but in practice it is close to 4 kHz which is telephone quality.

Not suitable for Music.