If you are making reference to OKWIN P25, I don't see any site in Chelsea. Isn't this roughly 39.3 miles from Bartlesville to Owasso? I suppose it is related to the sites being linked together in a trunked system.
At present, I can easily hear the Coryell SO in Gatesville in Temple and Waco, Texas, conventional P25. That is not very far.
In Texas, I once heard radio traffic from Conroe to Fairfield, Texas on the TXWarn system.
I have even heard radio traffic in Waco from Houston on the TXWarn 25 system when there was a site near Waco.