It's all about shielding and conductor size. If your system is DISH, and you change to dp, RG-59 does not have the freq. range of a good Rg-6. Not all RG-6 is created equal. There's RG-6, good for inside and OTA, RG-6U, sat, OTA and can be buried, then there's RG-6QS, the extra shielding provides more protection from noise, also according to the SBCA, satellite trainers, the coax must be RG-6 60% shield, copper conductor. If your RG-59 is working now it may not much longer, with all the new switch combinations that is just that much more bandwidth needed for everything to function properly.