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It's really just a rule of thumb. The 3' antenna is basically a loading coil. It's going to act differently that a full quarter wave antenna.

Everything is going to reflect RF, metal especially....

Yeah it does. How much depends. Of course the more RF you pump out the more RF gets sent back to the radio. 4 watts out it shouldn't be a big problem.

Maybe someone can take their tail light off, draw a pattern on a sheet of paper and e-mail, or mail it to you.

Sturdy is what you need off road certainly, and even on road from time to time. :thumbsup:

Ahhh yes, that's the picture I was wanting to see. The whole bracket. Now it makes sense. That should be quite sturdy.