I have a 211K that I use for my RV. Currently we have a SD TV, so I am still using a Dish 500 on a tripod to receive 110 and 119. I think I read somewhere that I could point the 500 to eastern arc. If I want to point to 61.5 and 72.7, how do I figure out the skew, azimuth, and elevation for the 500? I am thinking about upgrading to a HDTV in the RV, so I would need a new dish. I would like to be able to use one dish and point to both Eastern and Western Arc and just change out the LNB. What dish and LNB's do I need?