A hearing instrument comprises a microphone for reception of sound and conversion of the sound into a first audio signal, a signal processor for processing the first audio signal into a second audio signal compensating a hearing loss of a user of the hearing aid, a speaker connected to an output of the signal processor for converting the second audio signal into an output sound signal and a wireless communication unit connected to the signal processor for wireless communication interconnected with an antenna system for emission and reception of an electromagnetic field. The antenna system comprises a plurality of antenna elements and a switching device. The switching device is configured to actively feed a first antenna element of the plurality of antenna elements, and passively feed at least a second antenna element of the plurality of antenna elements, in response to switch control information.