I am thinking about upgrading my H20 to a HR21. I have a reward cert from BB that I can use to get this new HR21. My question is... I don't have time yet to pull another line from the dish to my H20 location. Can I continue using only one feed from the dish to connect to the HR21? I am planning to pull the additional line in about 2 weeks later but I want to be able to start record the Olympic games. I don't have any problem to pay $5 more a month to upgrade to the HD DVR package. Will the HR21 function with only one line feed from the dish?