Do you mean RSSI in the right hand column of this screen (Marked by the RED arrow)?
Click on the Select Columns button marked by the GREEN arrow above and select the RSSI button.
Then click on the Select Columns button again to close that menu.
S.
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For Pete’s sake, I hate feeling like an idiot. 
Thank you so much.
Now I can build a new antenna, but I still need to figure out gain settings in my RTL-SDR blog V4, would be great if it had AGC in Flightaware. I was using it with Airspy and the radio settings were awesome.
cheers!
Very soon after I put up my first ADS-B receiver I got the itch to improve it.
It didn’t take me long to decide I needed two system; one as a reference and one to experiment.
I built a second similar receiver with similar Pi, receiver dongle, coax and antenna and mount.
Not surprisingly, I got similar results.
I then proceeded to progressively change everything on my experimental system, one component at a time, so I could see and quantify the effect of each change. It didn’t matter what time of the day, day of the week, season, weather, sunspot cycle or time of the month.
It saved a lot of interpretation and guesswork.
Seven years ago my reference system cost me about $AU80 and is still running to this day now with a few upgrades.
It makes it very, very easy to see what each change makes.
As time goes by you accumulate odd bits of system that have been superceded and put into storage. I end up using to build new systems and now have 8 running and still have a drawer of
spare parts.
Great hobby.
S.
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