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This is just a simple collinear antenna for ADS-B on my RasbPi running PiAware that is still special to me because a) building antennas is a great joy and b) it uses an old screw from a desktop pc (spacer screw that holds the mainboard) which beautifully fits the antenna base that comes with most DVB-T USB sticks. So it’s just a matter of soldering these antennas on these (old) screws. The setup is 1/2 Λ + 3/4 Λ + < 3/4 Λ (but my wire wasn't long enough). ADS-B @ 1090 MHz, which translates to ~ 275mm Λ.