Addition: I think the problem is about LO leakage.
I made 4 different experiment. First, I used just my B200 both receiver and transmitter and a specific location which is the difference between 0 and 180 degree of Horn antenna is 2,5dB. Second, I used just my B210 both receiver and transmitter at same location with previous experiment, the difference is 0,7dB. Third, I used my B200 as receiver and B210 as transmitter at same location with previous experiment, the difference is almost 0. Fourth, I used my B200 as transmitter and B210 as receiver at same location with previous experiment, the difference is 0,1dB \~ 0,2dB. And I take screenshot in GNU Radio, you can check this band.
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