hello friends 
-Nearly all aircraft must be equipped with an ADS-B transponder. These aircraft then give off a ADS-B signal 
(at 1090Mhz) that can be used to track their location and altitude. This allows us to view it using a RTL SDR.
-here are the steps to successfully setup your RTL-SDR on your linux machine. 

-once you have successfully purchased and rtl sdr like this one : https://shorturl.at/ckI48
1. clone this repository from github : git clone https://github.com/antirez/dump1090.git
2. cd into the dump1090 and type (make) and click enter this will install the program. : cd dump1090 -  make
3. connect your rtl and check if its detected : rtl_test
4. if everything is up and running you could run the program straight from the CLI or through a GUI on your local host.  
5. there are 3 commands you could use for viewing :  ./dump1090 --raw  ./dump1090 --interactive To watch the graphical data on a map, simply enter;
./dump1090 --interactive --net
for the GUI open your browser and navigate to localhost:8080
6. I would recommend just using the ./dump1090 --interactive command through CLI it shows Real time air traffic
around you like : HEX , FLIGHT # , ALTITUDE , SPEED , LAT , LON , TRACK , SEEN.  
7. Once you're done observing and doing some RECON CTRL+C closes the program. 




				THANK YOU STAY CURIOUS