Airband, the Dallas-based provider of a fixed-wireless network for businesses, announced that it brought in $3 million in sixth-round funding from undisclosed investors to continue building out its existing network.

The nine-year-old company gives its clients access to broadband wireless data, voice over IP service, and other network management services. Currently, 3,500 businesses use Airband across 14 US markets.

The company last raised capital in 2007 amounting to $12.5 million. It has raised $73 million to date. Past investors include M/C Venture Partners, Crescendo Ventures, Dolphin Equity Partners, Driehaus Capital, Key Venture Partners and Sevin Rosen Funds.