Originally Posted by nakman
does 70cm propogate better in the mountains (and canyons) than 2m
No, it does not and that's the point. It is more easily absorbed by terrain and does not multipath as badly as VHF, is less likely to duct in the troposphere, so less interference and less chance for random DX. The low side of UHF is more VHF-like than VHF.
Like I mentioned, I usually ragchew on the RMRL's 449.450/-5MHz/103.5 and I suggest using 446.000MHz simplex if you want to check paths since there might be people listening on that.