The SWiM LNB has a SWM8 "multiswitch" built into it. It is capable of driving up to 8 TUNERS (not 8 boxes, DVRs count as 2 tuners). The SWiM LNB is NOT expandable. If you wish to have more than 8 tuners, you would then swap to a NON-SWiM SlimLine 3 or 5 LNB. The 4 leads coming from the dish can feed a single SWM8, SWM16, or SWM32 "multiswitch" directly, or can be split to any number or combination of SWM8's, SWM16's and SWM32's (each of which has an 8, 16, or 32 tuner limit). I'm not sure what the maximum limit is, but this is how they feed hotels and apartment buildings from a single dish.