JayminIf u have computer it is not useless.Mithunit is HD DVR / SD? If HD DVR u can get 90 cm dish & insist engineers to get signal strength above 80%. db is most important I dont whats call we it. Stay around them when they installing antenna with their signal meter. Notice their meter screen & check when they complete installation. Signal need above 80% & db above 14% of each TP. About my dth installation engineer didnt cross signal strength of 80% but when I complaint for few matters their sr. engineer with him & he done well & my box get 82% - 87% signal strength. Just prefer signal strengths from engineer signal meter. Stb signal status on TV is fake.