I haven't read the article, but are different mobile antennas being
compared on different vehicles, or the same vehicle? It's amazing how
many people don't realize that the vehicle is fully half the antenna,
and may in many cases play a more important role in determining overall
radiating efficiency than the supposed "antenna". So it's impossible to
draw any conclusions about mobile antennas based on comparisons done
when they're mounted on different vehicles. It's as much a test of the
vehicle's effectiveness as a radiator as it is the antenna's.

Roy Lewallen, W7EL