I thought that the rule of thumb for "maximum at best" radio reception was 250 miles for AM and 15 miles for FM (Dad ran a Radio Repair Shop in Brooklyn). But, it would also depend on the power of the transmitter, how the ions are lining up; etc. I prefer good roof mounted antennas, because you can tune/adjust the individual legs of the antenna. The TERK is an enclosed 6' by 1' ABS box, so any individual adjusting/tuning is not possible. I have no experience with this product, but negative experience with the amplified radio & TV TERK antennas, in general.
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