The present invention comprises an antenna device for a portable radio
communication device operable in at least a first and a second frequency
band. The antenna device comprises a first electrically conductive
radiating element having a feeding portion connectable to a feed device
(RF) of the radio communication device for feeding and receiving radio
frequency signals, a first ground plane portion arranged at a distance
from the first radiating element, a second ground plane portion, and a
controllable switch arranged between the first and second ground plane
portion for selectively interconnecting or disconnecting the first and
second ground plane portion.