I installed Sirius on my C27. I have it mounted on the stern rail, Ifind that when im heeling the signal gets very low and cuts in andout. If im on the hook or moored, or docked (basically if the boat islevelled it is fine.Does anyone else have this issue? If so, what did you do to resolveit? By the looks of it, Sirius does not have a marine antennaThanks.