27Dbi or 31Dbi

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 ?
 
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4 have 4 31db antenna one set runs at 65 and the other set runs at 85 still need to swop the 31 with 27 and see what happens.
 
Maybe i was doing something wrong, but the best i could get was like -85 not good.
 
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