Richard Harrison wrote:

Phil found a simple dipole only a few feet above ground would
outperform a mobile whip on 40 or 75 meters.
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Without more information, this comparison is flawed. A mobile whip has
a lower angle of radiation than a horizontal dipole. On 40 or 75, the
vertical component of radiation can be quite significant for close-in
stations (100 miles or so). At night, working long distances, the whip
may outperform the dipole. During the day, the dipole will probably
outperform the whip.

It all depends.

73, Bill W6WRT