1090 Filter

I getting an hard time to decode some ADS-B signals, my antenna is not ideal (using a J-Pole for 2 M 70 CM) and only aeroplanes right on top of my location wore decoded, so time for a filter. I got an ADS-B filter for 1090 MHz and now I can pick up ADS-B signals in a 150 Km radius, the next pictures show why:

No filter

1090MHz filter

With the filter the main difference is obvious, no more FM stations an less GSM.
These pictures wore made using qspectrum, and the filter is this one.

Spectrum Analyzer using DXPatrol MK4

The 2MHz maximum display from an RTL dongle sometimes is not enough, one way to deal with it and explore the spectrum is using QSpectrumAnalyser.

Using QSpectrumAnalyser with DXPatrol MK4 from 87 MHz to 1,5GHz

Just follow the instructions on AD-Vega/rtl-power-fftw