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It is necessary to use the gain (in dBd) at the reception angle, not the straight ahead peak gain. Assuming the UHF antenna is aimed due north, the amount of realized gain at ~75° off to the side is the correct number to use in that equation.
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That is correct. I was using worst case to be conservative so as not to promise more than what would be delivered (like what we have learned to do with trees). I was also trying to demonstrate the need to attenuate 26 to make it possible to receive weaker signals.
I did allow for it later when I was talking about the pattern, which is why I went to the trouble to find it and display it; I thought the CH32 pattern would be close enough.
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Originally Posted by rabbit73
The directional pattern will help attenuate 26 when the antenna is aimed North, but it might not be enough. CH 26 will be 74 degrees off-axis. Maybe down 15 to 20 dB.
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