This license in Logan County, Arkansas, has DMR emissions designator but it is a little southeast of Fort Smith:
ULS License - Public Safety Pool, Conventional License - KGJ743 - LOGAN, COUNTY OF
The full list of returns after doing a geographical search for all of Arkansas and 155.955 was this, but most are south or showed only analog (2 was deleted because it was Jackson Co and expired/replaced):
Call Sign/Lease ID Name FRN Radio Service Status Expiration Date
1 KGJ743 -- LOGAN, COUNTY OF 0001718345 PW Active 06/17/2023
3 WNMH894 -- HOPE, CITY OF 0001718725 PW Active 06/21/2025
4 WNQI580 -- PLUMERVILLE, CITY OF 0007404635 PW Active 07/25/2022
5 WPFE876 -- CADDO VALLEY, CITY OF 0006418172 PW Active 08/27/2024
6 WPGQ980 -- MITCHEVILLE, CITY OF 0012328324 PW Active 03/01/2025
7 WPVA267 -- JACKSON, COUNTY OF 0006212153 PW Active 06/05/2022
8 WQGA529 -- DEQUEEN, CITY OF WATER DEPARTMENT 0001719038 PW Active 11/28/2016
9 WQIF398 -- NORTH EAST GREENE COUNTY FIRE DISTRICT 0016984908 PW Active 01/23/2018
So...not sure. What part of SO MO? SE or SW? Wondering if it could be coming from TN or OK...