Which Freqs work best in built up areas

[NorthernRaider]

I already have three of the UV5s |I had 6 but got rid of them as excess to requirements along with a recently donated Yuasu ham transmitter which looked like something off star trek, gave em to a lad in Felling.

So I was planning on getting rid of the last three UV5s as well and just using modern CBs, but I think I will keep the UV5s as they appear to be more suited to urban areas, and they are still far more physically compact than hand held CBC. I may get ONE of the 8 watt versions of the UV5 and set it up as a base station, I've already got a 447 tuned antenna in my loft cut to 160mm length.

Sooner or later someone will tell me I can get PMR446 and 27 CB on one hand set