Represents a collection of antenna contour levels.
  Add | Adds and returns a new level with the corresponding value. | 
  Clear | Clears all contour levels from the collection. | 
  Contains | Checks whether the collection contains an object with the given value. | 
  GetLevel | Gets the level with the specified value. | 
  Remove | Remove the level with the corresponding value. | 
  RemoveAt | Remove the level with the supplied index. | 





