To connect at 150Mbps you must have a compatible and properly configured 150Mbps access point to connect to. For example, TRENDnet carries the following.

TEW-651BR 150Mbps Wireless N Home Router

https://www.TRENDnet.com/products/product-detail.asp?prod=230_TEW-651BR

TEW-650AP 150Mbps Wireless N Access Point

https://www.TRENDnet.com/products/product-detail.asp?prod=100_TEW-650AP

To achieve 150Mbps you must be using WPA2 AES encryption values and have set the channel bandwidth to Auto 20/40MHz.