Use this file with Google Earth to see location of ADS-B stations.
dl.dropboxusercontent.com/u/89611087/...
Sorry, I didn't realize the NavWorx was 978 only. That will drastically cut down on the amount of traffic you see without a tower as most aircraft broadcast on 1090.
EDITED to correct a misleading autocorrect.
With only 978 in, you'll be lucky if you see any traffic, especially if you're flying in remote areas. I doubt there are many aircraft with 978 out nearby. You won't pick up any ground station traffic unless you intercept a signal being sent to a nearby ADS-B out aircraft that is triggering a ground station.
That was an auto-correct typo I didn't catch. I'll correct it to remove the IN. Good catch.