I live about 4 miles from a small airport that gets ,on a good day about 1 or 2 planes in. it sits on top of a hill, my yard where I fly is about 400 feet below the runway surface.......I very seldom fly above my trees, that may be close to 60 feet high and well below the runway surface in a town of just over 6,000 people, I am out in the country, but that 5 mile circle covers the whole little town and a lot of the farms in the area, that is a chunk of land 10 miles across and almost all of it would put the 400 foot limit, well below the legal flying altitude for those small planes that can use the airport ...I just ordered a Q500 4K if it turns out it won't fly here, I will have to turn around and sell it and settle for my older drones without GEO FENCE installed...I do most of my flying in my yard and the field out back, if it won't fly there...it is worthless to me...I am 69 years old now, not many things to enjoy these days but flying my multi-copters safely is enjoyable to me....Over the years seems like everything I have enjoyed doing , somebody has come along and put so many restrictions on them that they are no longer fun to do...soon all fun things will be regulated out of existence.....................................By the way..If I ever flew my copter up to 400 feet I couldn't see it anyways.....I couldn't even get as high as the runway,let alone reach the planes above it.......