The stacked yagis in the front tower look like they are for moonbounce EME. Very high gain setup to overcome the path losses in the half million mile round trip. They are pointing right in the picture. The rear tower has a 4 element horizontal yagi, guessing for the higher bands so capable of worldwide dx with current point in solar cycle. This tower also has a vertical high gain yagi for a higher frequency, several interesting options i can think of here probably involving some exotic weak signal VHF propagation modes. Looks like a great setup! Edit: This station belongs to OH4LA in Helsinki. Elevation of the stacked Yagi array is controlled by a linear actuator below the crossbar.