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All of your calculated NM(dB) numbers are above the Plus +10.0 NM(dB) reference point number.
The Plus +10.0 NM(dB) provides some elbow room for signal variances.
The stronger signal strengths provide more elbow room.
The FCC reference point number is 0 NM(dB) for LOS Line Of Sight transmission and reception.
And reliable reception does happen with negative -NM(dB) numbers.
Last edited by teleview; 14-May-2013 at 7:55 AM.
Reason: Clarify information and typos.
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