Which Freqs work best in built up areas

[Lightspeed]

I missed this thread while traveling and it didn't pop up as an unread when I got back...

Anyhow, late but maybe of use.

UHF VHF(UV5r type walkie talkies) and CB Radios will have very hit and miss range in cities, especially from street level in heavily built up areas.

Answering the OP: A UHF/VHF walkie talkie would be (is) my choice as it is easier to carry and operate, being much smaller and less attention grabbing. Using a earphone with inline mike is pretty much identical to a mobile phone's. As Charles pointed out UHF and VHF signals tend also to be more effective at getting into and out of buildings.

So, hang onto the UV5rs NR (and get an SSB capable CB as well).