Below is a link to the groundwave field of a 1 kW non-directional AM
broadcast station located about 1 mile from the Atlantic, in Florida.
The groundwave field shown is based on the FCC M3 conductivity map, and
their GW propagation charts for this frequency and power.
The space wave fields radiated by vertical monopoles are related to their
groundwave fields, so space wave fields radiated over (mostly) salt-water
paths are much greater in magnitude than over terra firma (other things
equal).
Maybe this will give a rough idea of what to expect from a sea-coast QTH in
Maine.
R. Fry
http://s20.postimg.org/ylw4y5vn1/WMFJ_1_k_W_1450_k_Hz_Pt_Orange_FL.jpg
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