The present invention relates a low noise amplifier with adaptive frequency responses and method of altering frequency responses thereof. Furthermore, the wind turbine rotor blade has at least one patterning element for guiding a wind flow which is flowing from the leading edge section to the trailing edge section such that noise which is generated at the trailing edge section is reduced. The fixture system and base include: a base having at least one set of support brackets; a support member, having a shaft and a coupling joined thereto, adapted for connection to one set of support brackets; a connector extending through one set of support brackets and the shaft; and a rod having a first end that is coupled to the coupling.