IMO Figure 2, on a FA Stick Pro (Blue) the weakest signals can be approx -30/-40 dBFS
Take a look at this post
[quote].
Is there anything to be improved?
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Situation 1 (countryside):
- Get an LNA, i.e. the RTL-SDR ADS-B Triple Filtered LNA which has an excellent performance (matches the Uputronics and even outperform it in busy areas). You won’t need an additional filter. Take notice that it has to powered via Bias-T, so you will need another dongle with build in Bias-T (i.e. NESDR SmarTee, RTL-SDR V3) OR (preferably) a biaser with USB. The LNAs’ power requirements are: 3.3-5V, 150 mA.
- Replace the antenna with a better performing one. Mind you: A good antenna doesn’t have to be expensive.
For situation 2 (and 1):
- Get an Airspy mini ($99) or R2 ($169) dongle. However, if you want maximum performance, these dongles require more computing power and the law of diminishing returns is in effect.
For situation 1 and 2:
- Place the antenna outdoor, as high as possible with a free view
- Optimize the gain: see this post and this post. @wiedehopf has written an automatic gain optimization script.
In fact, reading the entire Thoughts on optimizing gain-thread will teach you everything you need to know about gain optimization.
edit: typo