When I used ear buds on stage (visible to audience), it wasn't wireless. It was just lines to a couple headpone amps (Rolls brand, and in between pairs of us) with long extensions tucked in our waist-bands/belts for strain relief. Not terribly elegant, but it worked for us. We were also not very mobile - we were actually in cage-like things, but that's another story... though, not as interesting as you might think. As long as you have a spare aux or two and some enough returns on your snake, it's doable.
When not visible, I use full-sized headphones with individual monitor mixers (Hear Back).