I'm building an antenna array that operates at high frequencies (around 2 GHz).

I want to use a SDR dongle that has a 75 ohm input impedance as receiver, I've also bought the coax cable, a 4 way adder and a line amplifier that have 75 Ohms as well as the Antenna.

The problem is I need to connect the antenna to a Low Noise Amplifier (LNA) and the LNA to the adder and eventually to the SDR. but they only sell 50 Ohm input/output impedance LNAs.

My question will this have a huge impact on my signal? what is the effect of this mismatch? is reflection going to be really significant?