Trend Band was developed to help judge the strength of the overall trend on the chart.
A more WIDE band indicates a stronger trend in that direction.
If the band begins to get NARROW, it could indicates a weak trend and a possible reversal.
If the Trend Band color MATCHES the current "BUY" or "SELL" signal, this is a good trade. If they do not match, it means you should probably wait for the next signal as the price is moving in the opposite direction of the larger trend!