Satellite dishes not only detect the desired satellite broadcast but also noise from natural and man-made sources. Noise from the surrounding environment and electronic equipment works in the opposite direction to gain and must be avoided if at all possible. A portion of this noise enters via the dish side lobes; a smaller amount, predominantly that from outer space, enters via the main lobe.sh noise temperature is a measure of how much noise is detected from the surrounding environment. The warm ground emits microwave radiation so noise temperature increases as a dish is pointed at increasingly lower elevation angles. Thus the reception from a satellite located closer to either horizon would be poorer than one from one located higher in the arc. Noise also decreases as dish size increases, since larger dishes have smaller side lobes and a more narrow main lobe.