Since I read this I started to take notice. Here are my findings after a couple of days of my travels in Iredell, Mecklenburg and Cabarrus Counts NC
1) Most homes don't fly an American Flag
2) Most yards don't have a political sign of any kind
3) Of the yards that do have a sign ,most are Trump 5/1
4) Yards that have a Trump sign about 60% have an American Flag
5) Yards that have a Biden sign 0% have an American Flag
Unscientific for sure but I think most of the current polls are no better.
There's more science in your poll than 90% of the polls you see on TV.