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Planes too close to receiver

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hello,
I have a DVB-T stick receiver and using DUMP1090 on Windows 7.
My location is near the local international airport and during several hours a day and according to the winds direction the landing planes are flying approximately 2km from the receiver's location and ~1700 feet above ground level. This is when I'm loosing the signal probably because of overflowed receiver.
This can be seen in the attached screenshot. The yellow arrow shows the distance between my location (the blue dot) and the planes route. The broken (straight) line is where I'm loosing the signal.

gain.jpg

My Dump1090 command line looks like this:
Quote:

dump1090.exe --net --net-http-port 7890 --enable-agc --gain 43 --aggressive
I found this gain value by using Trial and Error method but I suspect there is an influence on the maximum receiver range.
Is there a better way to configure Dump1090 for such situations or another way to find the optimal gain value?
Currently I'm using the stock antenna and the receiver is located on ground level with only ~180 degrees of sky vision. I intend to move it to the roof for clear sky view and use a better antenna but I suspect this will make my problem even worse.
Any thoughts?
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