On a car, attach a flag to the right fender or chassis. Although not officially recognized, many people attach a small flag to the antenna. The flag should always be on the right side of your car. Window flags should be on the right side of the car. If you have two flags, hang them on each side of the car with the canton toward the front of the car.
You can also place a flag sticker in any window as long as the canton is toward the front of the car. This is so that the flag is never in retreat. Don't lay the flag over the hood or roof of your car or any vehicle, such as a boat.