Currently have 2 sky dishes. Had one for sky and when had a mirror sub, sky installed new dish for 2nd box. Having sky+ installed on 31st Jan. What should I do with dishes? Keep one or both. If one which one? Does the larger dish give a better reception as it seems to do at present. Can a quad LNB be installed on a larger dish or is it only for mini dishes. Live in quite a hilly area although reception is good.