Various media have reported that there is a radio on Elon Musk's Tesla Roadster, now in orbit around the Sun, and that this radio is playing music (for example: BBC reporting that David Bowie's classic hit Space Oddity will be looping on the radio, iNews reports on the radio set to play David Bowie’s Space Oddity on loop). But radio communication in interplanetary space normally requires directional antennas and attitude control, both of which are not usually present in an unmodified car (well, attitude control is, but it won't work without friction). Nor do cars normally have radio transmitters.
Is there a really a radio on Elon Musk's Tesla Roadster, "playing" Space Oddity? Does that mean it's receiving a radio signal sent from somewhere, or rather that it is broadcasting this for anyone caring to listen? Can we communicate with it, then?