check this link out.. it has some good maps: http://www.dogstarradios.com/sirasasecoma.html
i would say if you have a balcony and mount the antenna as far out as you can you MIGHT pick up a signal, it all depends tho!
12/07-01/08: RCI Vision of the Seas (Mexican Riviera)
01/08-06/08: RCI Liberty of the Seas (E & W Caribbean)
7/08-1/09: RCI Independence of the Seas (Med, Ireland, Canary Islands, Transatlantic & Caribbean)