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For most of the continental US you can use a 75cm dish. Fringe areas may need a 90cm or larger dish depending on which satellite your trying to obtain signal from. You can use this chart to double check to see if a 75cm dish will be large enough.'''EIRP''' - Abbreviation for Effective-Isotropic-Radiated-Power'''C Band''' - the frequencies in the 4 to 6 GHz range used both for terrestrial microwave links and satellite links'''Ku Band''' - the frequency range from 10.5 to 17 GHz; in satellite communications, the frequency band 13.75 to 14.50 GHz for transmission, and 10.7 to 12.75 GHz for reception