Demonstrated By: NASA, hobbyists, universities
What Happens:
Small objects with asymmetrical capacitors (called “lifters”) can levitate when a high-voltage field ionizes the surrounding air, creating lift via ionic wind. They are essentially flying via field-driven air ionization.

Relevance:
While these don’t hover at specific frequencies, they show that EM fields can directly affect matter in air, and that field-dependent lift is possible — albeit not scalable in this form.