Where is best place to have a Marantz 10B tuned up

I live in NYC and would rather not have to ship this unit, but will listen to any recommendations wherever they may be.

Although this is a beautiful sounding tuner for the one or two stations in my area where transmission of good sound counts, I find that it does fall down in the area of raw station pulling power (sensitivity, selectivity and spurious rejection). Weak stations in my area, which are the ones with the good sound AND interesting music, are either not received or received poorly. I would like to know my options for optimizing this tuner. I just want to make sure that I am getting everything this tuner can deliver.

Thanks to all who reply.