Guthrie no longer operates as such. I can't remember which identifier they use now.
I still hear units identifying as 'Guthrie Air' on 458.900 (PLL 100)
I have some recent audio logs but they're distant, weak, and noisy on that frequency.
They're stronger as they approach the local hospitals and use Hosp-1 (155.340)
They also coordinate with the BGM tower from time to time.
Rich
Edit: You can see the RSSI is pretty weak from the logs.
Event, Date, Time, Duration, RelativeTime, Radio Info
======, ==========, ============, ==========, ============, ==========
000255, 2016/06/19, 02:36:57.702, 000012.519, 00:15:22.547, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 162
000256, 2016/06/19, 02:37:10.705, 000001.134, 00:15:35.067, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 128
000257, 2016/06/19, 02:37:13.947, 000005.167, 00:15:36.202, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 154
000258, 2016/06/19, 02:37:19.701, 000002.207, 00:15:41.369, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 154
000259, 2016/06/19, 02:37:22.323, 000001.686, 00:15:43.576, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 145
000261, 2016/06/19, 02:37:31.262, 000006.450, 00:15:45.852, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 167
000262, 2016/06/19, 02:37:38.747, 000004.351, 00:15:52.303, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 134
000263, 2016/06/19, 02:37:43.166, 000002.922, 00:15:56.655, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 158
000264, 2016/06/19, 02:37:46.268, 000006.377, 00:15:59.577, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 151
000266, 2016/06/19, 02:38:25.145, 000007.755, 00:16:16.250, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 166
000267, 2016/06/19, 02:38:34.290, 000001.143, 00:16:24.006, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 167
000269, 2016/06/19, 02:38:56.187, 000006.732, 00:16:30.211, ScanBroomeCounty, EMS , GuthrieAir , 458.9000MHz , C100.0 , 134