hi. i had a question on multiswitches. i recently upgraded from a hd receiver to a hd DVR receiver and was wondering if i could just use a multiswitch to split the signal from the cable that was going into my old reciver so that my new receiver could have 2 signals. would this work or not? do i have to hook the multiswitch up to all four outputs coming from my dish? by the way, i have directv with a 5-lnb slimline dish.