Optimising the gain adjustment made the most difference
look at ads-b-flight-tracking-f21/gain-adjustment-t37172.html
I had to reduce my gain to 38db for the best results, however, each setup is unique.
If you have the STD image you may need to do it manually.
flightaware.com/adsb/prostick/setup/
There is also a new image due out shortly. It should have a number of performance improvements.