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These kind of antennas DON'T count on having a metal mast under them, but they do count on having a feed line connected to them which serves the purpose you contribute to the mast.
Those radials on a typical groundplane kit are more 'line isolators' than anything. They aren't of any particular use as a counterpoise, they just aren't resonant in the right frequency range.
Looking for definite, always true reasons for why a particular antenna 'works' better (for whatever reason) is a lot of wasted time when it get's to this point. You have to consider everything around that antenna as contributing to how it works, and that isn't going to be easy or simple. There'll always be something that you didn't account for.
- 'Doc

[QUOTE="W5LZ, post: 344924, member: 129"] These kind of antennas DON'T count on having a metal mast under them, but they do count on having a feed line connected to them which serves the purpose you contribute to the mast. Those radials on a typical groundplane kit are more 'line isolators' than anything. They aren't of any particular use as a counterpoise, they just aren't resonant in the right frequency range. Looking for definite, always true reasons for why a particular antenna 'works' better (for whatever reason) is a lot of wasted time when it get's to this point. You have to consider everything around that antenna as contributing to how it works, and that isn't going to be easy or simple. There'll always be something that you didn't account for. - 'Doc [/QUOTE]

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