I currently have a Dish 500 with the dual lbbf (there are 2 coax connections at the lnbf). I want to connect another 301 receiver. The installation manual that came with the system is not real clear on the installation for 2 receivers.Basically all they show is a diagram showing 2 coax leads from the lnbf with each coax going to a separate receiver. Is this correct? An installer that I called in my area said I needed another head ( I think he was referring to lnbf) and a multiswitch.