I have a Dual LNB Dish 500 system but only have one receiver. I was wondering if I can hook up "any" older receiver to my system (i.e. 2700, 301, 3800 and etc.)? My wife is wanting to watch TV in the bedroom. I figure I would get an older receiver for less than $90.00. I also believe it will be an extra $5.00 per month for the extra receiver? What kind of coax cable should I use for the long run over 50ft.? Any gotha's to look out for when purchasing a used receiver? Thanks!