You cannot have 4 lnbs on one normal dish. It is only realistic to have 2, say for hotbird and astra1 which are 6 degrees apart. A switch for 4 lnbs means on different dishes. There is a manual switch called AB switch which can be used for 2 lnbs to connect them to the receiver alternately. The diseqc switch is operated automatically by the receiver when different sats are selected.