The goal of the paper is to improve the log-periodic dipole antenna (LPDA) design procedure introduced by Carrel. A computer-aided design technique is introduced, providing an easyto-use design method of LPDAs. Corrections to Carrel's design contours, and new constant input resistance and truncation coefficients diagrams are presented. The influence of the feeder characteristic impedance, and dipole length-to-diameter ratio on LPDA parameters is studied. Design diagrams for LPDA's typical of HF communications are included.