Editing Last mile (telecommunications) (section)

====Two-way wireless communications====
Two-way communication systems have primarily been limited to lower-information-capacity applications, such as audio, facsimile, or [[radioteletype]]. For the most part, higher-capacity systems, such as two-way video communications or terrestrial microwave telephone and data trunks, have been limited and confined to UHF or microwave and to point-point paths.

Higher capacity systems such as third-generation cellular telephone systems require a large infrastructure of more closely spaced cell sites in order to maintain communications within typical environments, where path losses are much greater than in free space and which also require omnidirectional access by the users.