This week, four media stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

This week, Knology (KNOL) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Knology is a fully integrated provider of video, voice and advanced communications services to residential customers in the southeastern United States. In Portfolio Grader’s specific subcategories of Equity and Margin Growth, KNOL also gets A’s. For more information, get Portfolio Grader’s complete analysis of KNOL stock.

Dex One (DEXO) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. Dex One is a marketing solutions company that offers various solutions to promote businesses on the Internet through its proprietary search engine marketing product, DexNet. For more information, get Portfolio Grader’s complete analysis of DEXO stock.

This week, Outdoor Channel Holdings’ (OUTD) ratings are up from a C last week to a B. Outdoor Channel Holdings is the principal owner of The Outdoor Channel, a national television network. For more information, get Portfolio Grader’s complete analysis of OUTD stock.

Charter Communications, Inc. Class A (CHTR) shows solid improvement this week. The company’s rating rises from a C to a B. Charter Communications is a provider of traditional cable video programming (basic and digital video), high-speed Internet services, and telephone services for residential and commercial customers. For more information, get Portfolio Grader’s complete analysis of CHTR 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.