I would think on getting a better aka commercial antenna than the Diamond Comet junk The Diamond will fail in the winds, and only have a 19 gauge steel wire with piss poor copper plating for an element.. not to mention the very thin fiber housing.
Is there one that you would recommend that has similar gain? Im not familiar with any commercial equipment. A wide band version would be nice so that i could still use MURS or something similar when my kids are out and about on the property. We are currently using some Baofeng uv-5r programmed with the FRS GMRS bands in them. Even at 5 watts, they won't reach all of our property. It would be nice to get a commercial wide band antenna that could keep SWR down in the higher frequencies for that application. But then again, with that much gain, i don't think it would make a difference when they are only 1/2 mile away. I have a feeling they would still be under the radiation pattern.