It has been ten years, since I had antenna classes in the uni, so I might be wrong, but I do not completely agree. Gain is the same in both ends, but my concer

It has been ten years, since I had antenna classes in the uni, so I might be wrong, but I do not completely agree. Gain is the same in both ends, but my concern about receiving is that gain is applied to everything. This includes interference and noise. So at the receiving end if the SINR is already bad, the antenna gain is not going to help much. This is why you apply the "Low Noise Amplifier" right after the antenna. To make sure that an already bad SINR will not get even worse in the rest of the receiving stages.