I reside near an airport. Once I take a look at the grid map, I see that my home is in a sq. that has a most altitude of 200 ft AGL. Should I notify the airport tower once I fly under the 200 ft? Or is the entire permission factor required if I need to fly above 200 ft? Once we say we're in a restricted zone does this imply at any (all) altitudes, or are we within the restricted area solely once we are above the utmost altitude for a given quadrant?