In most cases, a step backward for building penetration, but a step forward when it comes to multipath (also a step backwards for household electrical noise).
VHF also has an advantage through trees and hills, but the real appeal of going back to VHF highband is saving on electrical power. A TV transmitter is generally expected to operate 24/7 and the electric bill for a 1000kW UHF DTV station can be huge. VHF allows more "paper coverage" (coverage according to rules but not necessarily in viewability, and assuring cable/satellite carriage) for a lot less money than UHF.
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