i posted this in the builders forum but got no replies so i'll try here. i'm helping my uncle set up his h.t. next week and he is wanting to install an antenna to receive hdtv signals. he lives in a large two story house with a large walk in attic, he was told by someone we could install the antenna in the attic as opposed to on top of the roof. will this work? also in addition to the hd antenna he has a satellite antenna, can we run some kind of splitter for the coax or must we run two cables? thanks for any advice.