Need Sling TV while traveling. What's the best way?

I don't think so. If I'm not mistaken, you need good WiFi on both ends.

Im not sure what you mean by the above statement. The recording is done by Sling on their server. You just go into the guide and set it up to record the show - It is then saved at Sling. You can watch it whenever you want provided you have a good signal.