Ethernet cable in different room

I have an ethernet cable that reaches pretty far. But my TV is in the other room than my network LAN box thing. So,… I cant connect it. I have to transfer with a USB. Any suggestions as to what I can do otherwise? I don’t think there is anything else i can do. Because I cant move my cable box.

You can use a Wirelles adapter. You can get one on this  list.

or use a HomePlug AV device like the WD Livewire or others.

The original poster knows about WiFi, he is having a problem with that as well.