B11 link 26,4 km

hello! I am putting together a 26.4 km link with line of sight between two mimosa b11 and 34 dbi ALG antennas. we updated the firmware to 1.5.5. We align with GPS, but they can’t be seen. We change the configuration from AP to station and they are not seen either. Has the same or something similar happened to you? Thanks a lot.