I haven’t done any designs yet. I’m thinking about the steerer tube. It’s carbon so it shouldn’t impede the RF. Another option is somewhere within the saddle. Or maybe inside a reflector, on the wheel or otherwise. Possibly within a pedal, depending on the style of pedals. Or on the inside of a crank arm. Possibly epoxied to it. When the time comes for replacement, chisel it out of the aluminum, epoxy another one. 🤷