Ключевые слова: aerial, amplifier, antenna, background, broadcasting, building, cell, cellular, communication, connection, construction, devices, dusk, electromagnetic, emit, energy, engineer, equipment, frequency, global, gsm, industrial, internet, link, many, mast, metal, mobile, network, phone, radar, radio, receiver, roof, shadow, signal, silhouette, sky, station, sunrise, sunset, sunshine, system, technology, telecom, telecommunication, telephone, top, transmitter, wireless,