Could be that this is a VHF versus UHF issue. The channel numbers 2-13 are usually VHF and those with the higher numbers are UHF (or vice versa).
Remember on older sets you had to have a signal splitter (to split VHF from UFH). Is your antenna one that can receive both types of signals?
Assuming your antenna can receive both types of signals, you might not have a clear line of sight path to the transmitter for those stations you can not receive.
Those transmitters are usually placed on very tall buildings or antenna masts so that they can have a clear line of sight to most locations. However, if there is a building or other structure in the way, your antenna can not see the transmitter.
Ask your neighbors if they use an antenna and if they can receive those stations. Otherwise, buy cable or satellite service.
good luck!




