You could use two stretched out coat hangers wrapped in electrical tape as speaker wire, and it would work, barley. But would you?
Actually that would likely work very well. Obviously I'm assuming metal coat hangers. Those wooden / plastic ones would be rubbish
You'll be saying they don't work as car radio aerials next ! Austin Allegro, coat hanger aerial, Radio 1 on Medium Wave. Classic.
(This may be a bit UK specific )