Is that the device you would recommend for the hotel? Would it definitely be able to transfer data back and forth with people with cheap consumer grade wifi cards 150 meters away? The hotel is in Brazil so whatever I go down there with I am stuck with.

The AP for the hotel should also have ethernet capabilities. Can the Zigwire do that?

I also need an antenna for the AP in my apartment sending data to the garage. The AP is a computer running Linux so I don't want a standalone AP device there. Can you recommend an antenna? I doesn't need to be an outdoor item.