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Originally Posted by vt6364
- Modified DB4: Then I added the VHF elements to the DB4 like dmfdmf suggested, using 12-gauge bare copper wire. (Don't have any thicker wires on hand, and couldn't find any aluminum rods like I planned to). It is easier to attach to the front than to the back of the balun box because the screw is secured by a nut on the front (see pictures attached) inside the box. This box is easy to open, the front cap just slip on/off 2 small notches. So I attached the wires to the front instead, using appropriate nuts going on top of the existing nuts.
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Your mod looked great! I would have bet money you would get some kind of signal for RCH4, especially after your test. Sorry it didn't work.
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Result: Still got all the UHF channels the original DB4 got, but this does not help the DB4 to get CH4!
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Again, I am really surprised at this result. I am curious, did you rezero your tuner after the mod?
I've added such wings to other antennas (DB2 and a Yagi) with some success but not a DB4. I have read about others that have used this trick on DB4s (where I got the idea) with success which is why I mentioned it. Designers say that this method should work but it trashes certain UHF frequencies which is why they don't add it to bow tie antennas. If, as seems to be true in your case, the VHF wing trashes UHF channels you don't care about then it can be a good mod.