Furthest range of WGBH FM Boston --Maine, NH, ?

While i'm not familiar with the power output of the station, the locations that you mention, the terrain between the station and the towns that you mention, etc... investing in a "killer" FM antenna system ( like stacked Yagi's or Log Periodic* antennas ) mounted as high as possible may get you there. This could cost you several hundred dollars, but if you really like this station, it could be worth it to you.

Other than that, here's a rather interesting yet "techy" article about extending your FM reception. It uses two antennas in a phased array. If you read the article, these guys are talking about being able to sit in Indianapolis and listen to stations in Columbus, Ohio and in St Louis, Missouri via the use of a phased array. This can get pretty complex and i don't know too many "civilians" ( non-RF folks ) that are into doing such things, but i thought you and others in your situation might find it interesting.

If you don't want to go "gonzo" on a phased array, the antennas that APS offers are supposed to be the best available. While i know of other antenna designs that are superior to the technology that they are using here, i don't know of anyone that specifically markets such a design for commercial broadcast FM use. Hope this helps... Sean
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If it turns out that you can't get WGBH on your tuner that far north, you can still listen to their webcasts, which are in stereo and don't sound all that bad with an external sound card connected to your stereo. I listen to classical music webcasts from around the world everyday on my computer and stereo, with quite good results in general.