Using the Virtual Radar and Dump1090 software on the Raspberry Pi 4 Model B (4GB RAM) and the AirNav RadarBox Bundle.
Just to give you an impression of how far I can go - the higher it flies, the further I can track it:
Above image is from the Virtual Radar Server which shows the receiver range of all altitudes, therefore the maximum range of this setup.
Selected (yellow plane - around Hannover in Germany) is the CS-PHB (Embraer Phenom 300 from NetJets Europe) with details on the right,
here you can see that distance is about 375 km (about 203 nautical mile). It flies on a altitude of about 12 km or 11887 metre (39000 ft).
You will also notice that the signal is very weak, only an Average Signal of 6 (which is very low).
Use the download link in the menu to download this image and see in details.
Software I used, with download link or command:
Raspbian GNU/Linux 10 (buster), you can download this from raspberrypi.org and install on a SD card
dump1090-mutability 1.15~20180310, to install use the command: sudo apt install dump1090-mutability
Mono JIT compiler version 188.8.131.52, to install use the command: sudo apt install mono-complete
Virtual Radar Server Version 2.4.4, you can download this from www.virtualradarserver.co.uk or
install the new Virtual Radar Server Version 3 Preview 6 from here as I did