This week, 4 Communications Equipment stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

ViaSat, Inc.’s (VSAT) rating weakens this week, dropping to a D versus last week’s C. ViaSat, Inc. designs, produces and markets innovative satellite and other wireless communication and networking systems for government and commercial customers. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of VSAT stock.

Slipping from a D to a F rating, Sierra Wireless Inc. (SWIR) takes a hit this week. Sierra Wireless Inc. provides edge wireless solutions for the mobile computing and machine-to-machine markets. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of SWIR stock.

Resonant, Inc. (RESN) earns a D this week, moving down from last week’s grade of C. The company also gets F’s in earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of RESN stock.

Novatel Wireless, Inc. (MIFI) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in earnings revisions, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MIFI stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.