Satellite dish is designed to transmit and receive satellite signals from artificial satellites. A satellite dish is a mirror that catches satellite signal and sends it to the converter. Converter is designed for signal processing, which can "understand" the receiver. The signal is transmitted to the receiver under a special coaxial cable. Satellite dishes are distinguished by their design - they are right and the focal offset. Just focal satellite dishes are a cross-section of the parabola, the top and branches. Branches are located at right angles to the satellite and reflected signal at a point on the axis of the parabola, which is a converter. Just focal antennas are short-focus and long-(depends on where you mount the converter), but the work of the antenna is not affected. Converter to directly focus antennas is not entirely successful - it obscures part of the mirror, and therefore can not download directly focal produce compact size. They are always a large diameter. Just focal antenna is made circular, which contributes to high-quality collection of signal in one smooth point. The signal comes to the whole area just focus dish and is reflected in the converter with a larger area that provides better job. Just focal antenna can not be attached in an upright position without a large external bracket. And if the antenna is not vertically, it not only affects the quality of reception, but also collects on the surface of the antenna snow and mud, the accumulation of which would not benefit the work of the mirror. Because of the angle of straight focal antenna has to stand at a slight slant. Just focal antennas are more expensive than offset. They provide a better picture of the large size and it is therefore most often used in professional television and radio broadcasting. Great popularity among ordinary viewers got a different type of antenna - offset. Offset antenna contains only the branches of the parabola. Because of this design feature point at which the broadcast signal, is shifted from the center and the converter does not cover the part of the mirror. Offset antenna is made oval, thus reflecting the signal to the converter is projected splotch. Because of the construction of about 10% of the offset plates tlc remain unused. Offset antenna provides the ability to be mounted vertically, which allows fixing plates on the balcony or wall of the house. To do this, do not require large rigs brackets. Offset antenna does not accumulate sediment and debris. If you want to use the services of satellite internet rtm, in this case there is no difference - how to use the antenna. Any satellite dish offered in the sale, made of different materials: steel, aluminum, plastics, etc. The golden mean - is an aluminum antenna, since it is resistant to the effects of rainfall and not prone to deformation, and also quite easy. Plastic plates are sensitive to extremes of temperature, and can deform without apparent reason, simply because of the aging of the polymer. Excellent adhesion to plastic snow. Steel antenna is very solid and very heavy. And over time, can rust steel antenna, which would entail the compulsory shift plates. To produce just focus antennas often used a grid - it reduces the weight of large plates, less heat and reduces wind resistance, does not accumulate sediment and dirt, but provides lower quality signal than the solid right focal antenna.