I have had DirecTV for several years. Within the past couple of weeks they shut off PBS. In order to get my local channels I was told that I had to purchase a newer dish (which arrived today). It has the triple feed, multi satellite LNB. Can I simply connect the cable to any of the four connectors and I'll be ready to go? What else do I need to do? My receiver is really old (one of the original RCAs). Do I need a new receiver as well?