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Old 14-Oct-2011, 8:29 PM   #8
Senior Member
Join Date: Sep 2011
Posts: 135
Ok, so for example:

I have a channel at NM -10 dB. I thought this meant the signal "in the air." So wouldnt using dBi be correct (I am guessing isotropic means in-the-air, or a no gain antenna).

So, if I have an antenna rated at 10 dBi gain, then you're saying I cannot do -10 + 10 = 0 dB signal NM.

Instead I need to do -10 + 7.49 = -2.51 dB NM?

This means I need to get an antenna about 12.5 dBi gain to get over this 0 dB NM threshold?
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