The plaster in my walls fucks up 5g signals. Not sure about the windows. It doesn't deal with penetrating objects well. But if you have a 5g antenna inside the room.... I'm not sure how bad it is. any discussion with either side has turned up completely fruitless That being said I was a retard and got the s20 ultra. Don't do that. Get an s9 or something for 100 bucks and fkn abuse it