The grades of seven media stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, Knology (KNOL) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. 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’s (DEXO) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). 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 is a strong week for Liberty Global Plc Class C (LBTYK). The company’s rating climbs to B from the previous week’s C. Liberty Global owns interests in broadband, distribution, and content companies operating outside the continental United States, principally in Europe, Asia, and Latin America. For more information, get Portfolio Grader’s complete analysis of LBTYK stock.

Outdoor Channel Holdings’ (OUTD) ratings are looking better this week, moving up to a B from last week’s C. 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.

This week, Digital Generation, Inc.’s (DGIT) ratings are up from a C last week to a B. Digital Generation operates a nationwide network that links advertisers and advertising agencies with radio stations and television stations across the United States and Canada. For more information, get Portfolio Grader’s complete analysis of DGIT stock.

Live Nation Entertainment, Inc. (LYV) shows solid improvement this week. The company’s rating rises from a B to an A. Live Nation Entertainment produces live concerts and sells tickets to those events over the Internet. For more information, get Portfolio Grader’s complete analysis of LYV stock.

This week, MDC Partners Inc. Class A (MDCA) pushes up from a B to an A rating. MDC Partners provides advertising and specialized communication services to brands throughout the United States, Canada, and the United Kingdom. For more information, get Portfolio Grader’s complete analysis of MDCA 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.