If a 91XG or HD9095 were installed , the 91Xg and HD9095 are one direction antennas and will not receive channel 12 so a VHF high band antenna will be need to be installed any way. I think the U8000 one antenna solution will work. If a second antenna is needed for reception of channel 12 , a Antennas Direct C5 is made for VHF high and comes with a UVSJ - UHF-VHF Separator Joiner. .Here are places to buy Tv antennas and etc. ,
http://www.solidsignal.com ,
http://www.starkelectronic.com ,
http://www.amazon.com ,
http://www.3starinc.com