An adjustable multi-band planar antenna especially applicable in mobile terminals. The feed of the antenna can be connected by a multiple-way switch (SW) to at least two alternative points (FP1, FP2, FP3) in the radiator (310). When the feed point is changed, the resonance frequencies and thus the operating bands of the antenna change. Besides the basic dimensions of the antenna, the distance (x, y, z) of each feed point to other feed points and possible short-circuit point in the radiator, the value of the series capacitance (C31; C32; C33) belonging to a reactive circuit between the feed point and switch and the distance of the ground plane (GND) from the radiator are variables in the antenna design.