If we assume 3 active elements as in Figure 2, then one could argue that this antenna resembles somewhat a 3-element Yagi-Uda Antenna. That is, the driven arm is in the center, the reflector element is the longer dipole to the right, and the director is the shorter dipole to the left as seen in Figure 2. As such, the direction of peak radiation for the LPDA in Figure 2 is towards the left.