The 31db antenna’s is actually a pot k@k , installed 2 31db antennas today for a 11km link best signal a could get was -85 (snr of 15-20). Removed the the 2 x 31 and replaced it with 2x 27 grid antennas and the signal went from -85 to -70(snr 30 -40). Or maybe i did something wrong ?