Hi Kathy,
Welcome to our community!
As Christian pointed out, it’s most likely a placement issue. I’d suggest trying out a higher pole or placing the base in a more open area. Also, please check there are no power lines or other electronics nearby: they can cause RF interference.
The default SNR and elevation masks work well in most cases. But playing with settings can sometimes improve the situation. So don’t hesitate to try others if you feel it can help. I gave more details on how the masks work in this forum thread.