Should be
It should do a bang up job on VHF-HI, and 440-470 or so. It will probably do
pretty good on VHF AIR. Like most ham dual banders expect mediocre to poor
800mhz performance, but if you are near the repeater site, so what, it won't matter.
As far as your scanner goes that depends on the quality of the receiver and
how much RF gets pumped into it as a result of hooking up this
quality antenna. Some radios handle it better, some do much worse (like the pro-92-pro-2067) I used to have. I currently use a comet gp-15, which is similar but has 6 meters. Does great on VHF Low Band also.
But if you already have the antenna you won't hurt your scanner by trying it.
Jean