One secret is that the UHF driven element is a tetrapole, in the original version of the 751.
RCA likes to change the design in mid stream without changing the model number, usually to meet a price point with the loss of some performance.
Another secret is that the VHF section is an LPDA.
Another secret is that it is an original Winegard design.
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And with so few elements on the ANT751, it really is quite a good performer across the TV frequencies.
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A lot of good reports from users in strong signal areas.
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Any idea what that gap is for?
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Ask holl_ands. He does computer modeling of antennas. You can find him here:
http://www.avsforum.com/forum/25-hdtv-technical/
or here:
http://www.digitalhome.ca/forum/186-...h-development/