Minneapolis is in a river valley (the Mississippi River). From an airplane at cruising altitude the area will look fairly flat, but down at ground level there is a ton of 50-100 foot undulation. The elevation of your antenna is probably far more important than the quality of your antenna.
Fun: if you’ve got Apple Maps (I’m sure Android has this as well), ask for walking directions from Minneapolis to something 35-40 miles away. I chose “Elko New Market” - 36 miles from downtown. Click on the walking details and you can see the elevation change. You’re going from around 800 feet above sea level to 1100 feet above sea level, a difference of ~300 feet. But the total change over the course of the walk is nearly 4000 feet!
Fun: if you’ve got Apple Maps (I’m sure Android has this as well), ask for walking directions from Minneapolis to something 35-40 miles away. I chose “Elko New Market” - 36 miles from downtown. Click on the walking details and you can see the elevation change. You’re going from around 800 feet above sea level to 1100 feet above sea level, a difference of ~300 feet. But the total change over the course of the walk is nearly 4000 feet!