Need help with Magnum Dynalab MD 90

[prepress]

Maybe this is the place to ask this.

I have a Magnum Dynalab MD 90, using a Day Sequerra FM Urban Antenna. There are several stations the MD picks up but gets no sound on. Apparently the tuner can't pull in the signal well enough to matter. The stereo LED is on with these stations, but the signal is almost non-existent. Living in NY there is a lot of multipath to deal with. I'm across the street from Brooklyn Tech high school, which is probably another reason why reception is tricky.

I wonder if MD's MD-205 Signal Sleuth will help, since it would amplify signals, or do I need to consider a new antenna or (gasp) tuner to pull in more stations in an urban environment?