he penetration of EM waves with frequency 14 MHz, in which the E vector is directed along the wave vector [5,6], through metallic shields of different design in the near field of the antenna is investigated. Despite the fact that in a normally incident transversal wave, the theory predicts the decay of the signal E_out/E_in < 0.01 (i.e. less than - 40 dBWt) for the shields used in the experiments, the decay of the measured signal was no less than - 1.2 dB, i.e. an anomalously large penetration of the signal through the metallic layer was detected. This effect is due to the type of penetrating EM wave used, i.e. its 'longitudinally'.