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Yes you can easily make a 4 bay bowtie antenna that works better than any commercial 4 bay
Since most commercial versions still have most of their gain above 700 MHz, (where no dtv stations exist) they perform poorly on the lower half of the UHF channels
I've found that whisker length of 10 inches produces excellent performance
Below rf channel 40 where most of my channels are
You should also use a screen reflector vs one made of wide spaced rods for better performance
Curving the reflector and sweeping the whiskers forward will also improve gain and narrow the pattern
Conversely, bending the whiskers back towards the reflector will widen the pattern and reduce gain
Spacing between the bowties and reflector is also a huge factor
1/4 wavelength (approx 5 inches) works well on lower channels
The Winegard TV antennas are amplified and omnidirectional while the 4 bay is directional so it won't pick up stations off to the sides or the rear
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