Wolfe Research upgraded Broadcom (AVGO) to an outperform rating. Kevin Horner swings by to look at the chart and describe the recent trading patterns in the semiconductor stock. On the 30-day timeframe, he's watching upside resistance at $355 with downside support near $315. On a longer-term chart, Kevin says the $340 level should act as a test to see if shares can "get any upward momentum."