RG 11 would help. but you might want to look into an amp or 2.
Perfect Vision PVAMP1 Satellite Signal In-line Amplifier Booster 20 dB 950-2150 MHz LNB Dish TV Video DSS DBS Digital Antenna Coaxial Cable Run Channel Strength, 13 - 18 VDC, Part # Perfect PVAMP1: Oak Entertainment Centers and...