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Practical use, dense urban, flat, UHF is about 1km. VHF is worse.

Most radio amateurs would utilize a repeater to get over this limitation. Assuming there is a reliable repeater one is welcome to use nearby.

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In dense urban environments, VHF (~144 MHz) actually performs better than UHF (~446 MHz) for a few reasons... Lower frequencies diffract better around obstacles. VHF diffracts more readily around and over buildings than UHF. VHF penetrates building materials better than UHF — lower frequency = longer wavelength = better penetration through walls. UHF suffers from higher path loss over distance compared to VHF.

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