I was looking into getting a filter which would help with blocking the very strong GSM signals in my region. I had done the “Do I need a filter” test described in this thread and noticed that I would probably benefit from a filter since the EGSM-900 signals were really strong. It seems that this frequency band is used almost everywhere around the world. I thought that the FlightAware filter would be a good choice since many posts online had recommended it and the description says that it “passes range 980 MHz - 1150 MHz”. Well, I assumed it would mostly block everything outside that range but in reality it passes a whole lot more than that. Here are my before and after pics.
Without FA 1090 MHz Filter:
With FA 1090 MHz Filter:
As you can see the filter barely touches the 925-960 MHz range which is my main problem. Many of you pros probably knew this already but I would have appreciated a warning like this post ahead of time since the product description is quite misleading.