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TV Fool uses a dipole reference. Antenna gain is assumed to be specified in dBd.
dBi - 2.15 = dBd
If you start with a TVFR NM value, you can add the antenna gain (dBd) . The sum will be 'net NM' at the antenna terminals.
Amplifier gain will not affect net NM. Amplifier noise figure will subtract from the net NM.
Passive losses such as cable and splitters will not affect net NM.
A stable net NM of +10 or better should offer reliable viewing with most tuners. (Multipath, noise, adjacent and co-channel interference all work to reduce or destabilize the net NM.)
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 1-Sep-2011 at 4:40 PM.
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