You can use a paperclip or a piece of wire if you have access to a GPIO port: https://www.rtl-sdr.com/receiving-ads-b-jetliner-traffic-with-a-simple-paper-clip

You can use a paperclip or a piece of wire if you have access to a GPIO port: https://www.rtl-sdr.com/receiving-ads-b-jetliner-traffic-with-a-simple-paper-clip/ https://www.rtl-sdr.com/receiving-ads-b-jetliner-traffic-wit... https://www.theverge.com/2019/11/26/20981630/raspberry-pi-pirate-radio-fm-station-35-dollars-diy https://www.theverge.com/2019/11/26/20981630/raspberry-pi-pi...