Wyoming—Nevada—Utah-—Idaho—lots of open areas.
“Wyoming—Nevada—Utah-—Idaho—lots of open areas.”
Indeed! Most of those are probably worse than Colorado, it’s just that I’m personally familiar with Colorado. I live near the foothills just north of Boulder and cell service sucks. Go a couple a more miles west from here and there is no cell service at all probably until one gets to California, excepting isolated areas around a few population centers.