I tried adjusting the gain a couple of weeks ago with no changes. But I just found adcd567’s post on how to adjust the gain and I wasn’t doing it correctly. I was trying to adjust the gain by using the command line but since I had a Raspbain image setup I need to edit the “dump1090-fa” config file manually.
Now I actually have the gain set at 30 and it looks like I am now tracking “local” aircraft again. I’ll wait a day or so and check my coverage map to see how it has changed.
Thanks Sweepea11 and SoNic67 for the help. And thanks abcd567 for your tutorial.
FYI, here’s abcd567’s post on how to set the gain: