A new estimation method for the radiated far-field emission from PCBs (Printed Circuit Boards) with parallel traces was proposed. An equation for calculating the electric far-field due to common-mode currents on the traces being not always electrically short, was theoretically derived. The FDTD (Finite-Difference Time-Domain) method was used to compute the common-mode currents for the electric far-field prediction. A comparison of the predicted far-field strength with the results acyually measured for two types of prefabricated sample PCBs having parallel traces was carried out in order to validate the above prediction approach. As a result, good agreement was obtained between the estimation and the measurement in the broad frequency range from 30 MHz to 1 GHz.