I used to have fun tracking flights over my previous home using a little usb rtl-sdr antenna attached to a raspberry pi and leveraging the dump1090 software. I moved homes, and got too lazy to re-set things up...but that dump1090 software did the trick back then. Its been a few years, so there could be better software nowadays. dump1090 was a bit of work to do the initial software setup, but thereafter was easy. The 2 versions that i recall back in the day...

https://github.com/antirez/dump1090 (original i think?)

https://github.com/MalcolmRobb/dump1090 (the form?)

Have fun!