Thanks for your response.
.. That isn't antenna gain, it's total system gain...
Yes, and as you know, the antenna is what contributes positive gain, the other contributors are losses.
... Could be an array of them...
...If they're using four or five of them in an array, that could certainly make a pattern like the one they've filed.
True.
Coaxial cable, matching, and filter losses are usually the main losses to such a system. At channel 3 frequencies, these losses can be fairly low.
That HDCA-5 antenna is listed with a gain of 6.75 dB. An array to spread the energy in azimuth, as indicated by the WWWB pattern, could reduce the gain (depends on the number of units in the array and the method of stacking, horizontal and/or vertical).
So it is conceivable that system gain could be engineered to come up at exactly 0.79 dB.
Guess it may just be a question of why.
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No worry, I realize you have many other things to think about.
Thanks again for your thoughtful response.