ljhavener mentioned that the Kosmic SuperQuad with a loop gives increased VHF gain when the loop has discontinuities.
4nec2 gives this warning.
Code:
Warn.: volumes for Wires 38 (tag 40) and 40 (tag 42) are intersecting.
Warn.: volumes for Wires 38 (tag 40) and 41 (tag 43) are intersecting.
Warn.: volumes for Wires 39 (tag 41) and 40 (tag 42) are intersecting.
Warn.: volumes for Wires 39 (tag 41) and 41 (tag 43) are intersecting.
The increase VHF gain because of discontinuities seems too good to be true.
Hi Lassar
You will need to shorten wire 38 and 39 enough, that their volumes do not intersect/overlap the upright wires. The endpoints don't meet or overlap, but the volume is overlapping. It doesn't make a huge difference in the results, but it does have some effect. Once you resolve this overlap, you should get more reliable results. It looks like you will still see an increase in the HiVHF gain and a small drop in the UHF gain. It also causes higher SWR and more mismatch in impedance, mostly at the lower reaches of the Hi-VHF band. This may or may not be a problem, at your location. It might be a better choice, if you don't need to get those lower Hi-VHF channels, and need the extra Hi-VHF gain. The design is better, across the entire Hi-VHF and UHF bands, if you connect the loop.
Lawrence
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