That would depend on your desires.
If you want highest gain deep fringe type then go for an 8 bay.
In general longer wider spaced whiskers are better for low channels/frequencies shorter closer stacked ones are better for high channels. So tune to your suit your needs and locally available channels.
This is a 8 bay forward swept elements and reflector the whiskers are 10.286 Inches long and about 9 1/2 inches apart.
This is not my model it's one that mclapp posted on an antenna development forum. I'm pretty sure that's his site. And these are his pet project.
All gains are dBi
Code:
raw max 19.02 net max 18.967010607 SWR max 3.2944555157
min 16.93 min 15.7627488201 min 1.0829705732
Average 18.1965789474 Average 17.6330333435 2.045216139
The SWR gets excessive at the lowest 2 and the highest 3 channels. In the middle it's good. The 4 bay models are lower gain, easier to aim, and probably (I haven't really looked at the 4 bay models) do better SWR wise at the ends of the band.
As far as VHF high (7-13)the 8 bays have some. (didn't run the scans)
Hope that these generalities help you decide on a best for you build.
BTW A grey-hoverman variant as a DIY all around antenna is probably an easier build with ~ 15 dBi UHF and good VHF high as well.
This was to be my dx antenna but I am questing for extreme gain.
4nec2 modeling program is free and gives build dimensions from others models.(with very shallow learning curve,easy) If you wanted to exactly duplicate the above model.
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"All those are raw gain not net." The common understanding in the every day world is like saying , Up To.
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If you want to know the raw gain, netgain , and SWR for center frequency of all US UHF channels you can look it up in my
spreadsheet (no macros)
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Antennas Direct has done and has gone beyond what the experminters do in tuning antennas. And put all of that into a production antenna.
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And they magically know you want channel 14 but don't care about channel 49 too!
Oh, that's right they make compromises too only for the average user.
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and is this for 4 bay or 8 bay Antenna?
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The 8 bay is two 4 bays stacked so both and either.