It is the best solution, because it enables fully automatic switching of even four LNBs.
The receiver has to support at least DiSEqC 1.0. Most of digital receivers
enable generation of this signal. It is needed to assign DiSEqC signal to each satellite
in the receiver's menu. There are usually 4 orders available: A, B, C and D,
what means that four- input switch can be connected, and as a conclusion,
we have access to four LNBs.