A friend currently has two receivers. The installer installed two dishes (one primary, one for some extra locals) on the top of the roof, and ran two cables down to the house's closet and from there, used the existing homerun cables to the two receivers. If he wants to add another receiver, does he have to run another cable from the roof? There is no way he can climb up the roof. Is it possible to use some magic switch in the "closet" ? BTW, the check switch shows currently DPP Twin.