Review on ACDelco 25918632 Equipment Electronic Navigation by Bill Pulakanam

I know this OEM is good for my sat nav but the reception is not very good. In any cloudy weather, the navigation values are wrong. Navigator is also new. I could not compare the characteristics of the antenna with some others on the market, I feel that the antenna is not powerful enough to get a good signal. The antenna is located at the factory under the dashboard. I don't know if installing an antenna on the dash will affect anything else, but I'm trying to keep the factory look.