With only the driven element present the driving point impedance would have simply been "Z"11, but has now been modified by the presence of the parasitic element. And now knowing the phase (and amplitude) of "I"2 in relation to "I"1 as computed above allows us to determine the radiation pattern (gain as a function of direction) due to the currents flowing in these two elements. Solution of such an antenna with more than two elements proceeds along the same lines, setting each "V"j = 0 for all but the driven element, and solving for the currents in each element (and the voltage "V"1 at the feedpoint).