The paper confirms the feasibility of detection of faraway defects in long metal plates, up to 3.5 meters, using EMAT (Electromagnetic Acoustic Transducer) based on a Halbach magnet. The development and optimization of the new EMATs is based on 2D FEM (two-dimensional Finite Element Method) simulations using a physics-coupling formulation of ECT (Eddy Current Testing) and UT (Ultrasonic Testing) in order to increase the EMAT signal amplitude and its signal-to-noise ratio of the defects. The defects are located on the opposite side of the surface where the EMAT is located, with depths exceeding 20% of the plate thickness. Numerical simulations and experimental measurements confirm the feasibility of the method in a frequency range below 1MHz, opening up new possibilities for detecting faraway defects (1-3 meters) in thicker metal plates based on a single (emitter/receiver) EMATs using SH (shear horizontal) waves.