Our atmosphere in recent times has only been standout in Europe, the title winning season and the great escape.
All we either were playing well and winning plenty of games, had something to fight for or were in an unprecedented position as a club.
If we ever do extend the stadium maybe they could look at allocating an area of the ground as a singing section like they did at Wembley. This helps congregate people together and allow those who want to sing/ jump around to do so and those who just want to watch a game of football can as well. If they time it whilst extending the ground they can avoid uprooting existing supporters from their seats so everyone is a winner.
Has to be said we have by no means the worst home atmosphere in the league. The only ground I've been to so far this season with a good atmosphere is Huddersfield.