Cantenna stopped working

I have a Cantenna I use in Mazatlan, Mexico which I purchased on Ebay here in the States. Well, my Cantenna stopped working. Every once in a while, I suddenly get email for a few seconds or internet. I connect via a Ralink wireless utility. I have two antennas (because I thought it was the antenna and bought another one). They are an Alpha awus036h and an ALFA AWUS036NHA. They both produce the same results. I have been getting my signal from the Freeman Hotel, a local Best Western hotel. My friend's account also comes up (but not on my Ralink utility). The thing is, My Ralink utility says I am connected to the Freeman, but have no internet connection. Anyone with any experience in this? Thanks in advance!