This document discusses, among other things, a system and method for wirelessly transferring information electrotnagnetically at a specified first operating frequency range in a first medium and at a specified second operating frequency range in a second medium using an implantable multi-length antenna (120). In certain examples, the implantable multi-length antenna (120) can be configured to appear electrically as a first electrical length in the first medium and as a different second electrical length in the second medium. In certain examples, the first operating frequency range can be specified using the first electrical length and the second operating frequency range can be specified using the second electrical length.