I can highly recommend this ATU which I have now been using for a couple of weeks. It will tune my antenna (which has a narrow band-width) all the way from approx. 26.0mhz up to 27.9mhz with a SWR of 1:1.1 or 1:1.2 and it will also tune higher and lower frequencies but with a higher SWR. It is rated at 300 watts so it can be used with a small / medium amplifier or high-powered radio (for those with the appropriate licence).