For tips on how to properly align your satellite dish refer to the Dish Installation Guide . The next factor in signal strength is the quality and type of coaxial cable used in the installation. At 1450MHz RG-6 cable will lose about 8.7 dB of signal per 100 feet. Where RG-8 cable will lose only 4.5 dB per 100 feet. Other conditions can provide temporary reduction of RF signal, including sun transit periods and severe weather conditions.
More information is provided here on sun transit periods.