OP, is your house stucco, if so, there is typically a metal mesh screen that is attached to the block wall to provide a surface for the stucco to attach to. If this is the case I would suggest drilling a hole through the wall in adding an ethernet connection for this TV. You will need around a 12 inch concrete bit to get all the way through. Also the blocks at the bottom tend to have concrete fill, I would go higher up the wall.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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