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Earlier this summer I had set up a flight tracker using an RTL-SDR and some software called dump1090. It worked great at the time; I could track about 20 or so aircraft at a given time using the stock antenna I got with my NooElec branded rtl-sdr. That’s not terrible, but I knew I could have done a lot better. Today I decided to build a new antenna. I searched through different antenna designs online and ended up settling on an antenna called the cantenna.