I will give you two answers
In days of old (last year) Going from Davison Mi to St.Clair Township (I-94 and Waddams) I had a few drop outs.. I stream WTWW.US transmitter 2 while driving (My favorite on the road radio) or WRCJFM.ORG (Classical radio) so I notice the drop outs.. Same when moving from Fair Play SC to Seneca or Pendelton. Alas I don't do that any more. Same when moving from MI to SC (Also no longer doing that)
When Traveling to Elkhart I had places where my T-Moble was 0.0 and Sprint was 99 or better (on a scale of 100) in fact the data speed on Sprint broke the speedometer.
Now this year. Sprint and T-mobile have merged.. I no longer drive the Motor home to St. Clair from Davison. but I do drive the car to Port Huron (The very end of I-94/69) and no dropouts.