People under-estimate the distance of VHF. Contrary to books its not line of sight and gets out of canyons suprisingly well for a handheld, certinally better than CB. Would i trust either in the REAL back country, no. But there are thousands of 2 meter repeaters all over the country, and 100+ miles to a VHF repeater is not unusual at all. FWIW- a sat phone may not do well in that canyon either. The constallation is asyncronys, and if you have limited view of the sky it wont work until there is a flyby within line of sight.