angles appearance communicating communications communications-equipment connecting construction cranes distant distinctive electrical-signals equipment exterior external foliage greenery height high hill light modern radio-waves sending Signals steel steel-structure technical technology telecommunications telephones tower towering transmission transmissions transmitters transmitting trees concave dish electromagnetic mobile-phones parabolic parabolic-reflector receivers receiving round satellite-dish satellite-dishes water-tower slender tall telephony air traffic control airline airplane airport architecture atc aviation berlin command control control tower flight fly holidays plane radar standby tower signal tower views tracking traffic air-traffic-control aircraft architectural control-tower directions directives flying safety tower-signals tower-views visibilty bell bell ringing bell tower bells chimes church clappers cross faith group music musical pealing signal sound stonework symbol symbolic time timing