I currently have DirecTv (connected to two tv's) and DirecWay using the single oval dish. I want to replace one of the Hughes STBs with the Zenith HD520. Do I need to do anything special (i.e. add/change equipment) to receive HDNet and HBOHD (I already have the HBO package) or can I just swap the box? Will I need to call DirecTv to tell them I swapped boxes?