Microwave radiation is generally defined as that electromagnetic radiation having wavelengths between radio waves and infrared radiation. Microwave radiation can be forced to travel in specially designed waveguides. Microwave radiation can be transmitted through space or through the atmosphere in a microwave beam from a microwave antenna and the microwave energy can be collected with a microwave antenna. Microwave antennas are used for transmitting and receiving microwave radiation. Microwave antennas are usually essential parts of microwave telecommunication systems. Microwave antennas are designed either as broadband antennas or as antennas for a single frequency or band of frequencies. These devices typically comprise an open ended waveguide and a parabolic reflector or horn and they typically transmit a predetermined frequency in a predetermined direction. Microwave antennas are usually equipped with a reflector having a structure of predetermined shape on which is placed a mirror for reflecting microwaves. The structure and the mirror are supported by a frame mainly formed of tubes welded together or of welded or riveted compartments.