Chicago-based ExteNet Systems, which designs, builds and operates network infrastructure, has received $128 million from SSP Offshore, SBA Communications, Centennial Ventures, Columbia Capital, Sevin Rosen Funds, CenterPoint Ventures and Palomar Ventures. This brings the starup’s total funding to over $150 million.

ExteNet’s fiber network infrastructure are widely implemented by wireless service providers. The company promises providers with the ability to expand coverage to hard to reach spots.The new funding will support further development of infrastructure for wireless service providers.