[600MRG] For discussion: Re: Top loading a vertical on LF/MF

[Neil Klagge]

 To the 600m gang:
The reason for initiating this discussion is that, for me and perhaps
others, it is not feasible or possible to add top loading wires to a 630m
vertical without sloping the load wires downward a considerable amount.

I know that when an antenna is “folded back on itself” there is
cancellation of some of the radiation from the antenna. This is certainly
the case for top loading wires that reach toward the ground down to less
than half of the height of the vertical section.

The question I find myself asking is this: “Is what I will gain in ERP
worth the effort it takes to add sloping top wires because of the
cancellation that will occur.” I wonder if 1 or 2 dB gain is worth it at
the receiving end.

I would be interested in feedback from those who have any experience with
both situations: Namely, top loaded verticals and “topless” verticals  ;-)

73, Neil Klagge, WG2XSV, W0YSE


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