wikipedia notes
UHF radio waves propagate mainly by line of sight; they are blocked by hills and large buildings although the transmission through building walls is high enough for indoor reception
but apparently the big advantage is power.
Here’s the line up in my city
ABC-7 (VHF 7): 30 kW
NBC-4 (UHF-48): 813 kW
CBS-9 (VHF-9): 12.6 kW
Fox-5 (UHF-36): 1000 kW
A substantial savings, wouldn’t you say?
