Since we have been getting blitzed with email questions, here are the some additional Gain Master information:
The GainMaster LNB arm is pretty much exactly like the arm of any 18" dish, except a little longer. An LNB can be mounted to this arm in the standard way. Alternatively, two or 3 LNB's can be mounted using an included attachment which screws onto the LNB arm, holding the LNB's by the throat. Two standard dual LNB's plus one Sat-C kit (with a Sat-C LNB and Sat-C combiner) are necessary for the multi-sat solution. A multiswitch will be needted as well. If you have an older 18x24 dish without the integrated multiswitch, you only need the dish. Otherwise, you will need a multiswitch as well.
By-The-Way, we are testing the unit as we speak, we should be able to give more data soon (1 week).
AntAltMike,
I beleive you are right about Wax_Trax357 with regards to Sat C, however we have shipped out a few dozen of these in the last few days. I have recieved several emails (because I asked) with positive results.