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1

You certainly can feed the dipole with coax without a balun at the feedpoint, you will be able to work stations that would not be good on the dipole alone. The downside is that the noise level of the whole system dipole + coax will be higher. As the coax will radiate and also receive signals you will have a very different "radiation pattern" ...


2

If "ill effects" include common-mode current on the feedline, no. You can of course just tolerate the common-mode feedline current. In some situations it may not matter.


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From memory, that looks the same as an end fire arrangement for a pair of verticals, uni-directional that is. As suggested by other members, you need to take into account for the velocity factor for each type of coaxial. And you only get one chance once you've cut it. So I would strongly advise to use MIL- Spec cables as you can rely on the data sheet more ...


2

The Christman feed system using 84 and 71 degree lines is an example in ON4UN's Low Band DXing book where 1/4 wave ground mounted verticals are used. The line lengths are calculated from feed line impedance and driving impedance of each antenna in the array. If the antenna configuration is changed so does the driving impedance, and the phase shift will no ...


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