Exception to the rule
In the case of the ANT-751, it fits a niche due to it's physical form factor and size. Also, there's a lot of real world experience that supports this particular antenna's quality and capability. I wish I had more vendor provided data than I do, however, I can use a conservative set of numbers (1 to 3 dB gain H-V/UHF) and see through experience that my estimate is close.
(On the other hand, there are plenty of other RCA branded antennas that may work as well as the equivalent products from other vendors, but because vendors like Antennas Direct, Antennacraft, Channel Master & Winegard do a better job of documenting their products, I lean their way.)
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