IfNcollinear antennas are individually center driven, the only transmission line in the neutral plane is the one for a central unit ifNis odd. Since lines that are not in a neutral plane constitute antennas, such an array is not practically useful.For a single driven unit with symmetrical, parasitic, collinear elements, the driving transmission line is in the neutral plane and may be replaced by an equivalent generator and terminal‐zone network. An array with two parasites is analyzed. Since the currents in the halves of the three units are not alike, three simultaneous integral equations occur. By making reasonable assumptions these are reduced to the single equation of the isolated antenna but with a different kernel. Approximate expressions are obtained for the currents and for the mutual and self‐impedances of the elements.The collinear antenna with outer elements driven from the central one by phase‐reversing stubs is studied. For three elements components of the currents in the several possible modes are obtained with different degrees of approximation. The in‐phase currents in the antennas are greatest, and are obtained with considerable accuracy. The currents in the outer units are not symmetrical, but with elements of length &lgr;/2 the odd components of the currents are shown to be negligible.