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To the best of my knowledge I've never heard of any advantage when going beyond 1/4 wave radial length. There is some talk that the radials should be 5% longer then the calculated 1/4 wave for best performance. Even that 5% doesn't seem to make too much difference. Can you use longer then 1/4 wave radials? Yes. Consider a 2 meter 5/8 wave magnet mount antenna. The 1/4 wave radials would be about 18 inches yet we place them on a car that has a much larger ground plane and they work fine.

[QUOTE="Shockwave, post: 204185, member: 10882"] To the best of my knowledge I've never heard of any advantage when going beyond 1/4 wave radial length. There is some talk that the radials should be 5% longer then the calculated 1/4 wave for best performance. Even that 5% doesn't seem to make too much difference. Can you use longer then 1/4 wave radials? Yes. Consider a 2 meter 5/8 wave magnet mount antenna. The 1/4 wave radials would be about 18 inches yet we place them on a car that has a much larger ground plane and they work fine. [/QUOTE]

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