What Is a Broadening Pattern?
Also called a megaphone or expanding triangle, the pattern features an upper trendline connecting rising highs and a lower trendline connecting falling lows—the lines move apart rather than converge. Each swing exceeds the prior extreme, signaling participation from both aggressive buyers and sellers. Broadening tops often appear late in bull markets; broadening bottoms can cap panic phases. The pattern expresses uncertainty: neither side maintains control for long. Trading it differs from triangles—you often fade extremes or wait for failure at the fifth touch rather than betting on mid-pattern direction.
Broadening formations are less common than flags or triangles but memorable because volatility expands dramatically inside them.
How Do You Identify Broadening Formations?
Map at least three higher highs and three lower lows with trendlines that clearly diverge. Volume often spikes at each extreme as stops trigger. The pattern should be visible on the timeframe you trade without forcing lines across unrelated spikes. Broadening wedges are a variant where both boundaries slope in the same direction while still expanding. Distinguish from normal rectangles—rectangles keep parallel support and resistance. Time symmetry is loose; megaphones can extend many weeks. Note where the pattern sits relative to long-term trend—late-cycle tops versus counter-trend noise.
Five-point reversal setups, per classical technical analysis, watch for the fifth tag of a boundary before fading the move.
How Should You Trade Broadening Patterns?
Range traders sell near the upper trendline and buy near the lower trendline with tight risk beyond the extreme—only when oscillators confirm extension and volume climaxes at the turn. Breakout traders wait for a close outside the megaphone with follow-through, trading in the direction of the break. Because expansions accelerate, stops must sit beyond the latest swing extreme, not at the midline. Measured moves are less reliable than in symmetrical triangles; use prior swing structure for targets instead. Reduce size—whipsaw frequency is high.
Mid-pattern entries are the lowest edge—liquidity is worst between the trendlines where direction is undefined.
What Confirms a Breakout From the Megaphone?
Close beyond the upper or lower trendline on volume above the pattern average, followed by a second bar that does not immediately re-enter the formation. Failed fifth-tag reversals that break the opposite boundary can spark fast trends. In broadening tops, breakdown below support often accelerates as long liquidation feeds on itself. Bullish breaks above the upper line in broadening bottoms require skepticism—verify sector and index alignment. Retest of the broken line that holds converts uncertain structure into a cleaner trend trade.
News gaps through megaphone lines can skip retests—use smaller size on gap entries.
What Risks and Failures Should You Expect?
False breaks at both boundaries are common—price exits then snaps back inside. Late-stage megaphones in euphoric markets can throw multiple upper-tag failures before the real top. Position size must shrink as range width grows—ATR expands and stop distance widens. Broadening patterns on thin charts are often random spikes, not tradeable structure. Do not apply triangle measured-move math blindly. When in doubt, stand aside until a simpler pattern forms post-megaphone.
If you fade extremes, cap daily loss—one trending break against your fade can erase several small wins.