angles appearance communicating communications communications-equipment concave connecting dish distant distinctive electrical-signals electromagnetic equipment exterior external height high light mobile-phones modern parabolic parabolic-reflector radio-waves receivers receiving round satellite-dish satellite-dishes sending Signals steel steel-structure technical technology telecommunications telephones towering transmission transmissions transmitters transmitting amplifier analogue audio backdrop background bass computer digital electricity electronic equaliser graph graphic green hardware hi-fi illustration level meter noise oscillate oscillating oscilloscope output pattern power radio Recording red software sound stereo studio television transceiver treble Tuner unit variation vector visual voltmeter volume wave yellow tower