Figure 6: (a) Schematic view of an observer, of the far-field polarization of the double U-shaped power isotropic radiator at the angles , and at multiples of of the angle . The observer looks into the direction of the negative Z-axis. The polarizations have been drawn by rotating them so that they appear perpendicular to the line of sight. The green drawing represents the direction of the current of the radiator at a given time. The red ellipses represent the electric field, while the blue ellipses the magnetic field.  The tip of the arrow (in black) indicates the phase for a given time, and the arrow points in the direction of the rotation of the fields. (b) Similarly as in Figure 6(a), but here the observer looks into the direction of the Y-axis, and the polarizations are drawn for and .