Billionaire investor Carl Icahn wants a board seat at Motorola, and on Tuesday he took out a full-page advertisement in the Wall Street Journal to let investors know. Motorola, he says, "has stumbled, and stumbled badly" due to failed leadership and oversight at the company.

The letter makes reference to a recent Wall Street Journal story that cited Motorola chief executive Ed Zander as saying, more than once, "I love my job. I hate my customers." Motorola said the statement was meant in a teasing manner.

Icahn will find out soon if his efforts will pay off, as shareholders will vote on board seats at the annual meeting on Monday.

This is the latest in a string of public jabs between Motorola and Icahn since the investor first targeted the mobile-phone provider in January. The company's board has publicly stated that Icahn knows very little about the mobile-phone business or the technology Motorola develops. Icahn currently controls 2.9 percent of the company's shares, which have lost 25 percent of their value since October.

Institutional Shareholder Services, which advises investors on corporate proxy votes, recommends that shareholders vote in favor of adding Icahn to Motorola's board. It cited the company's poor performance compared to its competitors and Icahn's track record of effecting change at struggling companies.

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