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There is usually more than one hookup and for parks it will be mounted on the side of the coach someplace with a spring loaded cover over it. The antenna you are trying to use on the roof may be an older analog unit and due to most all signals being digital now, it won't give you much if anything. IF it is a digital unit, it may be that the switch on the wall panel where the tv attaches isn't switched to that. Most newer units have this, but older ones might not. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.