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I'll throw in my 2 penneth...

Basically if the RF doesn't have a good enough ground/return path it'll take the path of whatever it can prioritising the path of least resistance first and that is outside of the coax braid.

On a mobile installation with a correctly installed antenna the RF flows over the surface of the vehicle, in this case the roof, and not down the coax.

It would seem that Mr.Mercurio is a realist and understands that a number of installations will be the most half-assed you are going to find (magmount on a biscuit tin or the refrigerator type or just thrown on the roof of an outside shed) and that the coax is likely to be the path taken for the ground and therefore that is possibly why the lengths were chosen.

[QUOTE="M0GVZ, post: 456044, member: 22312"] I'll throw in my 2 penneth... Basically if the RF doesn't have a good enough ground/return path it'll take the path of whatever it can prioritising the path of least resistance first and that is outside of the coax braid. On a mobile installation with a correctly installed antenna the RF flows over the surface of the vehicle, in this case the roof, and not down the coax. It would seem that Mr.Mercurio is a realist and understands that a number of installations will be the most half-assed you are going to find (magmount on a biscuit tin or the refrigerator type or just thrown on the roof of an outside shed) and that the coax is likely to be the path taken for the ground and therefore that is possibly why the lengths were chosen. [/QUOTE]

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