The FlexRadio Tuner Genius XL is a plug-and-play amateur radio tuner developed by 4O3A and marketed by FlexRadio Systems. It is available in a 1 x 3 or SO2R antenna switching configuration. Not only does it work with FlexRadio’s it can also be integrated with OEM radios from Icom, Kenwood, Yaesu, and Elecraft. Unlike the HF Tuner from Palstar (HF Auto) with mechanical tuning which can be very slow, the Tuner genius XL can be tuned to memorized frequencies well less than 1 second.