I have my setup on a 100 foot tower on a high spot in Florida (about 120ft above sea level) so on average I can see about 260 nm on average out. I currently have a Pro-stick plus on a Raspberry PI 3+ and it seems to be doing ok. I was about to try to put up a tinkerboard with a airspy and see if I got any better results but while the rig was being tested on the bottom of the tower, the tower was hit by lightning and it went down the Ethernet cable taking out just about everything attached to the tower.
So at this point I have replaced my main rig with the same pro stick and Raspberry PI 3+ but I am wondering if I should even bother getting another airspy as the equipment would be about $200.
At the moment I get during the busy times about 1400 messages per sec and I just wonder if I am going to get anything useful with better radio.