There are several reasons why stations broadcasting from the same location may not be received equally.
1) Not all stations are full power. Some have stronger signals than others
2) Frequencies are different. This means propagation effects such as multipath are different.
3) The actual location of the transmitting antenna on the building could affect the received signal at your location.
With the above said, you still might be able to get it on your list if you try a scan at different times of the day and in different weather conditions. You still will probably not be able to receive it 100% of the time.
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