I guess your right I do have restrictions. Won't go down that road. Vertical is a must.
I've suggested a few good verticals for you that don't require wire radials.
There is some engineering work to do, to use any of them; but they will all dramatically outperform the CHA-250B and similar fibreglas monopoles with fancy matching networks in their bases, and they'll all handle more power as well. The CHA-250B and its clones (Diamond, Jetstream, et al) all have a low power rating/limitation because the devices used to create the broadband match dissipate power and can blow up if you overdo it.
"Those" verticals also are very poorly decoupled from their supporting system, which is why in their instructions they recommend mounting them on a 20' pipe, because the pipe becomes part of the antenna. Mounting one on a 50' tower can detune them, because that's not the intended mounting structure.
I'd go for a more conventional vertical such as one of the ones I recommended earlier, and just be sure it can handle the winds where you are.