Heres what I do when i travel. I bring my trusty MacBook Pro with me, log in to my xfinity account and connect the MBP to the Tv via HDMI cable and thunderbolt adapter. I just bring my wireless mouse so i can control the MBP from across the room.
I can watch all the stuff thats available out of home and watch anything thats on my DVR.
If you have a AppleTV you can also do the same and just airplay it to the Apple TV. This only works from a laptop. Comcast blocks airplay from my iphone to apple tv. Dont understand why, I am doing that same thing with my MacBook.
This could work for some of you who want to use that extra TV in your home and not incur another outlet charge.
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