While the books don't all mention this about symt triangles. Prior trend has alot do do with which way the symt triangle breaks.
TIP: Experience has taught me when in a up trend it breaks up, in a down trend it breaks down and with no trend it's 60%/40% up.
TAT had a previous down trend. Caution !! Plus entry is after upper trend line break. Only a small position is warranted at lower trend line bounce.
TIP:
All trades which have a declining trend line to break, shoukd be played in 2 steps. Like the double bottom, 1st one at small, at positve reversal, crossing down trend trend line and second larger at resistance. Or Reverse Heads & Shoulders, Rising Wedge, Flag & Pennant, or Cup & Handle.