he already has a circular lnb.....the invacom is both....Buy or borrow a CIRCULAR lnb for Dish Network. Install it at the focus point of your dish. Set your receiver for the proper lnb lo for whichever one you have. Aim for Dish's satellite 110W.
but i agree....
drive the dish to 110w using USALS then aim for that
you might also want to try 97w instead of 91w.....97w has alot more active transponders