"The pole mount attachment is designed to fit a standard 1.25 inch antenna mount or any one-inch nominal pole or pipe (1.315 inch outer diameter) and anything in between."
That is pretty clear if you even try to look up what they say works from https://help.tempest.earth/hc/en-us/articles/115005229767-Siting-Installation-for-Tempest
I’d suggest since those were your first post plus two followups that you consider leaving your attitude at the door before you make the next post, or it is unlikely you’re going to get a lot of help from anybody…
FWIW - there are dozens of posts here about what works, with pointers to the most highly recommended fence top rail that is 10.5’ long and works perfectly with the Tempest. One thread with the parts that work is Attaching Pole to 4x4 Wood Post?