100 Yards? Do you mean 100 feet? There is a big difference, and there is no reason for you to be walking 300 feet away from your model for a range check. 100 feet is sufficient. A lot of radios will run out of range with the antenna down at over 100 - 150 feet anyway. Mine will fly with the antenna down (don't ask how I know ), but I wouldn't try it again (knowingly).