Hooked up my Roadpro RPSWR-2C swr meter. No matter where I set the buttons, it pegged the needle all the way over to the right. So I don't think its working. One thing I did notice though, with the Midland antenna, even with the power on low, when I keyed the mic the radios meter would always show all the way up like full power. With the DPD antenna, the power meter actually showed the different power levels of the radio where I set it, on low the radios meter would only light 2 bars, on medium 3 bars, and radio on high power, all the bars would be lit. So my testing continues.