What device can be used as a gateway for my Ethernet only TV?

I don't want to use Ethernet because my router is upstairs. Not willing to use a very very long Ethernet cable. So whats the solution?
Update: I have plenty of USB ports on the back of my TV.
Update 2: A router will solve the problem, but I don't have it available right now. I tried my tablet but couldn't figure it out.
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