To be used to pick up high definition local channel programming from DIRECTV Built-in SWM Multiswitch gives a single wire to feed multiple receivers. Will feed 21 tuners. The dish you choose depends on what satellites your locals are broadcast on. DIRECTV Approved DIRECTV 21-Tuner SWM LNB for Slimline Dishes (3D2LNB). Simplify your DIRECTV system with this LNB that lets you use up to 21 DIRECTV receivers without an external multiswitch. This is just the front portion, this does not include the reflector or any other accessories. Easy installation onto any existing Slimline dish. To be used to pick up high definition local channel programming from DIRECTV. Includes LNB Only. Unlike the SL5, the SL3 receives satellites 99, 101 and 103. The dish you choose depends on what satellites your locals are broadcast on. Built-in SWM Multiswitch gives a single wire to feed multiple receivers. Will feed 21 tuners. A Non-DVR Receiver = 1, a Non-Genie DVR = 2, a Genie DVR = 5.