~ Parabola- something bowl-shaped (as an antenna or microphone reflector).

 ~Parabolic reflector- is a reflective device, commonly formed in the shape of a parabolic of revolution. Parabolic reflectors can either collect or distribute energy such as light, sound, or radio waves.
 

 ~ Antenna- a usually metallic device (as a rod or wire) for radiating or receiving radio waves.

~ Electromagnetic Spectrum- the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light.

~   Wavelength- the distance in the line of advance of a wave from any one point to the next point of corresponding phase.
 

~   Frequency- the fact or condition of occurring frequently.