David G. Nagel wrote:

Actually it is acting as one half of a dipole. It is just a
non-resonant half of a dipole. Remember "di" means two.

Dave WD9BDZ

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In a strict sense you are correct, but in the context here where one
half of the dipole is an eight-foot whip and the other half is four
feet of car body, we don't have much of an 80 meter antenna without the
coupling from car body to earth ground.

Bill, W6WRT