A unit for wirelessly transmitting power to an implant unit configured to be located in a subject's body is provided. The unit may include a flexible carrier including an adhesive backing configured for attaching the unit to skin of the subject, an antenna associated with the flexible carrier, the antenna being configured to wirelessly transmit power to the implant unit in response to a signal applied to the antenna, and a buffer layer disposed on the flexible carrier at a position to be between the antenna and the skin of the subject when the carrier is attached to the skin of the subject, the buffer layer being configured to establish an air gap between the skin of the subject and the antenna.
