I am having a DishPro 500 Twin LNBF and DishPro 500 Dual LNBF. The DishPro 500 Twin LNBF is pointed toward 119 West and 110 West. The DishPro Dual 500 LNBF is pointed towards 148 West. I am having a SW21 switch. One wire is coming out of DishPro 500 Twin LNBF so I assume it is having an internal switch which is combining 119West and 110 West. The wire from DishPro Twin and DishPro Dual is going to SW21 switch. The problem is I am only getting 148 West signal if I am having both connected. I get the signal for 119 West/110 West only when Dual LNBF is not connected to the SW21 switch. Please help.