because its a 4 foot antenna vs. a 6 foot antenna . its a much larger silver plated heavy guage coil vs. a lil silver wire . but mostly , none of the folks that IMO possess a lot of knowledge on antennas on the forums has ever suggest they perform as well as the 1000/5000 . i try to learn from the mistakes and experiences of others , as well as my own . it hurts much less to learn from others mistakes .

in certian applications im sure they are better choices than a 1k or a 5k and in those situations it would be the better antenna , but not necessarally the better performing one .

im far from an authority though .
im just another part time idiot with a few opinions and a little bit of experience .

__________________
Frank Zappa observed, "It's not getting any smarter out there. You have to come to terms with stupidity, and make it work for you."

I use the flexible wilsons (cophase) on my work truck (peterbilt 379), and am very suprised with the performance. I chose them, because of the flexability so that I wouldn't break mounts when bending them over on tree branches. I never could get them tuned very well, but acceptable, and have no problem talking to base stations 20 miles away with my barefoot magnum m-1.
Local talking is real good, but I have yet to be able to get any DX contact with that setup.