hi there need some help please had bell expressview installed a dual Lnb dish with 2 recievers, i'm wanting to install a third reciever they are aware of that but want extra money to do so. the way they installed was 4 cable wires coming out of the Lnb bringing it down to 2 cable wires going to the recievers. we do have some knowledge satelite but not 100% certain,, been many years since we have had one. Do we need to install a switch to add 1 or more recievers or do we go from the Lnb unit it self than to the third reciever, any help would be appreciated