There are lots of free tele-channels in the city, i.e. having adjusted on their reception you can not see any transfer, however channel is not assigned us to use. Why?
The zone of stirring influence of TV (or radio broadcasting) stations considerably exceeds a zone of service. For example, the transmitter that has capacity 100 Wt has a zone of service in radius of 11 km. And the distance on which it can create interference to reception of other radio stations, is about 111 km. At a choice of frequencies for the organization of an announcement in each item the main criterion is the opportunity of the new transmitter to work without mutual interference in the developed transferring network.