There are two types of RF used in remote controls: RF to component, and RF to infrared. Adjustable antenna A separate adjustable antenna determines the most reliable position of an RF extender and therefore enables virtually interference-free operation of multiroom systems or devices in concealed environments. The antenna has a built-in interference indicator that blinks when detecting an other RF device or other interference source (e.g. microwave oven). The harder the indicator blinks, the l