You don't have to pull up a chart of the S&P 500 to see what's happening in the broad market right now -- Comcast ( CMCSA) has been a good enough proxy since November. The $107 billion cable operator has been bouncing within a well-defined uptrending channel for the past six months, shoving higher each of the last five times it hit trend line support. Now Comcast is testing that same trend line support level in today's session. >>5 Consumer Stocks Ready to Push Higher Comcast's channel gives traders a high-probability range for its price action to stay within. When you're looking to buy a stock within a trend channel, buying after a bounce off of support makes sense for two big reasons: It's the spot where shares have the furthest to move up before they hit resistance, and it's the spot where the risk is the least (because shares have the least room to move lower before you know you're wrong). Shares are bouncing early in this morning's session -- and now makes for a good time to be a buyer. If you decide to jump in here, I'd recommend putting a protective stop right below the 50-day moving average. If CMCSA falls through the 50-day, we know we're wrong on this trade with minimal losses.