Good evening, I have a question about using the antenna tuner in the KX3. Is it necessary to hit the ATU TUNE button after moving the VFO by a few hundred kilohertz or after a band change? What happens if I don't? Will the ATU kick in and do it's thing on it's own? Kinda confused about this aspect of my new radio... 73, Joshua Gould K8WXA EM89pn