I have several Polyphaser IS-60UX-C1 devices. They're rated 125 to 375 watts on 50 MHz to 700 MHz. Can these be used on HF? At what power level? I know the IS-60UX-C0 is rated for 2kw on HF. What would be the downside if I did attempt to use one on HF? KB3X Drax