Bandwidth. I use my sling pro hd overseas all the time. If you get a good connection you no problem. Watched an NFL game on my laptop in Saipan and once in Finland. It wasn't HD on my laptorp, so I usually switch over to the non HD s video input, but it is definitely worth having. TV shows it's just like going back to an SD TV when overseas. If you've got a much larger upstream pipe you might have better HD luck overseas.