Off axis, since CIII has such a good signal, yes it ought to pick it up off axis.
RE: Detroit. You can try lower elevations for antenna mountings. You may get lucky, you may not. At 25' your map is clear though with signal strengths and pathways that Detroit is on the ragged edge of being reliable. Only at 50' do you begun to have a enough signal to move it into "weak but likely reliable.'
Now you are in, 'very weak, intermittent' at 25.'
Cheers.
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