This is a great section, you just want to sit as close to row A as possible. If you sit past row E, you won't be able to see the plays made at the warning track below you. Sitting in row A will also allow you to see the scoreboard in center field a little better and also see into the Nationals bullpen below on the bottom level.
To give you an idea what the view of the field is like from section 239, here is a Youtube video shot from there during a Nationals/St. Louis Cardinals game at Nationals Park.
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