If your signal path is obscured by physical obstacles that are out of your control, you are at their mercy as far as whatever reception you might achieve. In other words, you'll get whatever you get and that's it and it's impossible for anyone to reliably predict what might happen. This can be a difficult concept for consumers accustomed to near-ubiquitous cell phone service to accept, but it is the reality of TV reception.
A "medium range" 7-51 antenna should work well. Be patient in selecting a mounting location and do not drill any holes until you have satisfactorily demonstrated reception.
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