Just a small update after some time:) I have bought an RTL-SDR LNA+triple filter to test whether if it helps the poor chinese dongle to catch some planes. Well it did helped but, according to some research done by the russian folks, the dongle has so many flaws that I will use it only to listen to a local radio:) SDRUnos ADSB plugin decoded some messeges but I never got more than 20 planes even with my coco antenna tuned to 1090MHz. I would recomend to everyone to stay away from this panadapter.