I am in a downtown Building in Houston, Tx. We have a UHF/VHF TV antenna outside our office building. It was okay for analog, when digital hit, reception went to crap. On the fence where our antenna is, someone across the hall put up one of those DIY HDTV antenna and a person who works over there said they are pulling in many channels. Question, If we took our antenna coax and also connect to his antenna, will it screw up his reception? It is difficult to get to antenna, just want to do this once, not have to go back to disconnect it if possible.