I would take the antenna to where the tv is and connect it directly to the tv and rescan. If you can get some stations then you know the antenna and tuner works. It could be the location of the antenna in the garage (too much interference) , the cable connection from the garage, splitting the connection, or maybe even the wrong type of antenna. I would go to TVFool.com, put in your address and see what stations are available to you. Then post that information in the Local HDTV forum for your area. You will get advice from folks in your area that can advise you on which antenna would work best for you, installation, etc.