OK, it didn't win the design competition, so this proposed radio tower will never be broadcasting over a city near you, but its harp-like cables and rings sure do make a cool structure in the sky. Designed by the London-based firm Architects of Invention for a site in Santiago de Chile, the tower would have included a circular walkway suspended above the city below. For other entries in the call for a landmark radio tower, stop by Plataforma Arquitectura. [Architects of Invention]