Taking the role of interaction of return stroke ion beam forming current flow in preionized plasma channel due to stepped leader, a study on the radiated electromagnetic power in the form of ion Whistler Anomalous Doppler Shifted (ADS) mode from lightening return stroke channel is made. As a result of beam particle interaction the return stroke ion beam is retarded by the plasma wave turbulence in the stepped leader. The current thus generated does not vary linearly. Its variation can be approximated to be of the simple harmonic form. In this paper it is estimated that the only one quarter of the total energy of the return stroke is given to electromagnetic waves.