TDS Ranger ~ Old Leica Robot & Radios

I am still working on my backup plan to keep my 1998 Leica TCA 1100 (old army green) robot working as a robot in the future.

Does anyone know of a radio link setup exists that would allow the TDS Ranger to run at the rod with a radio inside (no wires)?

Thanks, Brad

(Thanks to TW for all your email help too)