What jammies said. Though, I think I will cast my vote with Traditional's suggestion as someone who is totally anti-wireless. I have had a lot of success with cold air returns. It may take a while of fishing. Tie a heavy bolt to some string and throw it the length of the cold air return upstairs until you find the down-channel. If you are lucky you can get cable through cold air returns down to the basement, where you can tie them into a common switch.
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