If you're in a concrete and steel structure, you pretty much need a window that faces the signal so as to allow the signal in. If you're on the "wrong" side of the building, you're usually out of luck unless you can catch a signal reflected off some favorably-located building or hill. Your Detroit stations transmit from the Southfield area.
The other (slight) possibility is that the internal amp in the SS3000 is overloading the tuner on only the strong signals. You may wish to try an un-amplified antenna.
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