The huge part of the populated area of Russia is covered with base stations. In the fields they look like red and white towers and in the city they are hidden on the roofs of houses. Each station receives a signal from a cellphone at the distance up to 35 km and communicates with a cellphone via engineering channels and voice canals.
A base station represents a couple of iron boxes locked inside a well-conditioned room.
An antenna of a base station has some sectors. The vertical one communicates with mobile phones, the round one connects the base station with a controller.