Abstract: An antenna device includes a first antenna configured to operate within a first frequency band, a second antenna configured to operate within a second frequency band, wherein the second antenna is separated from the first antenna by a distance, and at least one parasitic antenna element, wherein the at least one parasitic element is substantially orthogonal to the first antenna, to the second antenna, or to both the first and second antennas, so as to substantially isolate between the first antenna and the second antenna.

Abstract: A hearing aid includes a hearing aid assembly having an antenna for emission of an electromagnetic field, a transceiver for wireless data communication, the transceiver interconnected with the antenna, and a housing for accommodation of the antenna, wherein the antenna comprises a first section having a length between at least one sixteenth wavelength and a full wavelength of the electromagnetic field, the antenna being positioned so that current flows in the first section in a direction that corresponds with an ear-to-ear axis of a user when the housing is worn in its operational position by the user, whereby the electromagnetic field emitted by the antenna propagates along a surface of a head of the user with its electrical field substantially orthogonal to the surface of the head of the user.