Join Date: Jul 2008
Location: North of the GTA
My understanding and I admit it has been a long time since I used a Legacy Quad is that they are powered by the Receivers and need no Power Inserters.
Ask your neighbor if HE has a Power Inserter and as you have tried his Quad on your Dish, try your Quad on his Dish, at least then you will know if yours works.
Also see how many receivers he has connected, maybe it requires power from more than 1 receiver to work but I doubt it.
EDIT: Why are you considering the Quad.? Why not look at another alternative, let me know what models and how many of each and I might be able to point you in a better direction.