Useful items for purchase

Highly recommended combination:

https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/ https://rtl-sdr.com/new-product-rtl-sdr-blog-1090-mhz-ads-b-lna/

Good cheap starting antenna: https://www.ebay.de/itm/1pcs-ADS-B-PCB-Antenna-1090MHz-Antenna-SMA-female-Antenne-CASE/253915016420 plus adapter: https://www.ebay.de/itm/1PCS-SMA-Male-To-SMA-Male-Stecker-RF-Steckverbinder-Adapter-Koppel-GeradeTyp-T4/352599709689

Good coax SMA: https://www.amazon.de/DELOCK-Stecker-Buchse-CFD200-loss/dp/B00A8FUX40 (Shorter lengths are always better) https://www.amazon.com/Delock-Antenna-Cable-Plug-CFD200/dp/B00A8FUX40

Or via your local supplier LMR195, LMR200, CFD200 cable.

Interesting filter for other amplifiers (i would still prefer an LNA with builtin SAW filter): https://www.ebay.com/itm/1-SMA-M-F-50-VBFZ-1065-Bandpass-Filter-Mini-Circuits-for-FlightAware-1090MHz/132406298935