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There is a difference in power figures from the theoretical to the actual radiated power. It helps to know the mitigating factors related to the distance to the 1mv contour for determining Effective Radiated Power (antenna gain, height above average terrain, station class separation rules, ect.). And as a result, FM stations can go as low as 1 watt ERP for a LPFM, down to ten watts for Class D FM translators and down to 10 watts at night for Class D AM stations that were formerly Daytime Only licenses. New Class D AM licenses are no longer granted but are eligible for the new FM translator for AM ruling. Check out the CDBS (FCC database) for specific stations and their licensed power levels.
At the recent NAB/RAB Radio Convention on the East Coast, a FCC official was questioned about 89.7. He said that the Commission intends to clear out that end of the band for other purposes. No new license grants are being issued. Only very low power short range video field links are being allowed to use that part of the RF spectrum.