Abstract: This relates to a radio frequency heating system for heating PET preforms. The system includes two parallel applicator plates or electrodes and the coupling of a radio frequency power supply thereto. Both the radio frequency applicators are isolated from radio frequency oven cavity and are electrically balanced and operated in a push-pull manner so as the net induced currents in the adjacent transport system are maintained to a minimum level and also the electric field strength between either the applicator plate and the transport system is half of that between the applicator plates. It also includes the use of inductors or stubs at specific points to provide for more uniform radio frequency voltage by reducing the voltage standing wave radio.