Hey 222DBLF, Can those Sirio 5000's be mounted directly on a flat surface like a pickup truck's headache rack? That's how I have my 10k mounted to a heavy S0-239 mount. Just wondering because I like to use 10 meter and ssb. On 10M my SWR is almost 3 at the upper end. I still want to be able to use am,ssb, and 10m. Would I need anything else to mount this antenna that you know of. 73