We tried hooking up our tailgater this weekend. The only way we could get it to work was run the coax in through a window and directly into the receiver box. Is this the way it has to be? We thought you could use the cable in port on the outside of the trailer to get signal to the receivers. Is there some other sort of booster or something we have to have to get it to work through the outside port? It really sucks to have cable running in windows all over the place. Thanks.