Can you got through this process:
What is the Maximum Range I can Get?
Or just post your GPS position with 3 decimal places?
There aren’t really many ADS-B flight in your area, see this nearby station:
https://flightaware.com/adsb/stats/user/CliffReed
How is your view to the north?
Maybe there is some problem with the antenna installation resulting in bad reception.
Could you provide a photo of where you mounted your antenna, in case it’s a bad position i should be able to tell.
And try and answer this: how far to the horizon can you see when you stand next to your antenna?
You have a FlightFeeder so you can always ask FA for assistance via email: adsbsupport@flightaware.com