Chan Network Dist Path NM azim target gain
(mi) (dB) (deg) (dbi)
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20 CBC 19.8 LOS 49.6 50 0
18 Ind 26.2 LOS 46.7 -50 0
40 19.8 LOS 44.4 50 0
44 OMN 20.2 LOS 43.1 50 0
64 OMN 20.2 LOS 41.6 50 0
35 Ind 26.2 LOS 38.6 -50 0
24 SRC 19.8 LOS 37.4 50 0
32 CW 57.6 LOS 37.2 0 0
65 GTN 19.8 LOS 34.9 50 0
66 Sun 19.8 LOS 34.8 50 0
53 Ind 19.8 LOS 33.5 50 0
43 PBS 57.6 LOS 29.5 0 1
14 Fox 57.5 LOS 24.2 0 1
39 CBS 86.2 LOS 21.7 -5 1
33 NBC 85.4 1Edge 17.5 0 5
38 ABC 87.5 1Edge 12.9 -5 8
26 Ind 87.1 1Edge 11.5 -30 9
49 MyN 86.3 1Edge 7.7 0 10
7 Ind 88.0 2Edge -7.2 -10 8
23 ION 100.2 2Edge -13.5 10 16Yes. But I don't know what is the right amount.If I understand you correctly, it looks like you are trying to spec an antenna that has just the right amount of gain at the channels/frequencies of interest...so for the far away stations you want lots of gain and for the locals you want reduced gain to prevent overload...correct?
The most important number to pay attention to is the Noise Margin, in the "NM(dB)" column, for each of your local channels. These values tell you if you are above or below the detection threshold for each station and by how much. Since these values represent the amount of signal "in the air" at your location, you need to have enough margin to account for building penetration, cable loss, splitters, tuner sensitivity, and other factors specific to your setup. If you take the initial NM value for a given channel, add your antenna gain, subtract all the other system losses, and still end up with a value above 0, then you should be able to detect that channel.
