In this paper, we propose the method to eliminate EMI (Electro-Magnetic Interference) in ELF(Extremely Low Frequency) band below 2 KHz for extending the gesture-recognition distance of smartTVs to more than 3m using electric potential sensor. First, we measure the electric field generated fromthe back panel of a TV and propose the effective arrangement of two sets of differential sensors aswell as the shielding method using metal fiber. Also, we eliminate the PLN (Power Line Noise) andother noise generated from the TV and sensors as well as surrounding environments using filters. Usingthe proposed EMI eliminating methods, we evaluate displacement ratio on measured signals accordingto distance between sensors and a moving hand. Experiment results show that our proposed methodcan extend the hand-gesture sensing distance using EPS (Electric Potential Sensor) up to more than3m, which is enough to satisfy applicability of EPS based remote control to Smart TVs.