I'm hoping to get HD signals into my H21, with a "SL3 SlimLine Four Out Ka/Ku LNB (SL3)". Alignment is the big challenge, and frequent activity (it's in an RV). With this SL3 going into the ASL-1, I plan to align using the ASL-1, powered by a PI-21, and then, using a "cheapie" signal meter...