Phase reversal sound barriers, composed of periodic slotted waveguides, have shown promising results in low‐frequency noise control for plane waves normal to the obstacle, when compared with solid barriers. The phase reversal effect results in destructive interferences in the shadow zone of the barrier. In order to introduce this new phase‐controlling device in real conditions (obliquely incident ground reflections, variable source position, etc.), it was necessary to investigate its performance at any angle of incidence. This complementary experimental study, performed in an anechoic chamber, is a verification of the previous theoretical [Mongeau et al., J. Acoust. Soc. Am. 80, 665–671 (1986)] and experimental [Chvojka et al., J. Acoust. Can. 13 (1985)] studies. The results show that, in a measuring plane normal to the slots (waveguide entrances), the performance of this new type of barrier remains quite unchanged at any oblique angle of incidence within −60 ° to +60 °. On the other hand, the studies have clearly shown that this performance is much more angle dependent in a measuring plane parallel to the slots.