I added 1090 MHz LNA and SAW filter made by Nvarcher to my ADS-B RX equipment. It is directly connected to the 5.5 dBi antenna and power supplied by USB-C. The device remarkable improved the RX, adding >10dB dynamic range resulting in about 50% more airplanes ‘seen’ and stable DX >400 km. You can find the situation befor (w/o LNA/SAW filter) and after (/w LNA/SAW filter) in the embedded PDF document: graphs1090_ Performance Graphs
Now I am considering to replace the RTL-SDR.com USB stick by Airspy R2 SDR RX and more antenna gain with a collinear antenna which may provide another ~10 dB dynamic range.