Direction of maximum radiation from non-resonant end-fed aerials

In an earlier work by the author, attention was invited to the approximation involved in Bruce´s formula for direction of maximum radiation from the end-fed aerials of finite lengths. Using graphical method for solution, an asymptotic value of the constant involved in the expression for the tilt angle was obtained. It is currently shown in the present work that this constant is not independent of the length of aerial and has got values ranging from 0.205 for quarter wave length to 0.372 for sixteen wave lengths long aerials. From these considerations it is observed that the degree of approximation involved in the value of tilt angle as per Bruce´s formula is considerable and for the optimised six wave lengths long aerial the error is 3.4 degrees.