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Mystery solved. On either report, click on a Philadelphia station (I checked WPVI) in the table to get a path profile. Do the same for a Baltimore station (I checked WBFF). In both cases, you are heavily shadowed by terrain, and going to 35 feet does not get you out of the shadows. The propagation model is estimating that you will catch more energy closer to the ground, and only by 2 dB or so.
Note that WHTM comes in much better at 35 feet.
Last edited by Dave Loudin; 24-Jun-2010 at 8:27 PM.
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