If you just want to hook up a 18" round and the 72.5 you're good with a 4*4 foor up to 4 drops [ 4 receivers or 2 DVRs ] for more you'll need a 4*8.
If you plan to get a multisat 3LNB dish at one point get a 6*8.
As long as they are rated up to 2.15 Ghz you'll be good.
If you plan to get a multisat 3LNB dish at one point get a 6*8.
As long as they are rated up to 2.15 Ghz you'll be good.