When it comes to radio reception...size does matter (shady)
I've used the OE, a BMW Z3, a custom 3" handmade german one (off e-bay), and for grins I tried a full size black Miata whip.
Guess which one worked best...yup...the long goofy one.
So in terms of reception ( trying to get a Tucson FM station...45 miles as the crow flies with a mountain range in between) the order is:
Long whip...watch out for branches
OE
BMW Z3
3" custom shorty
If you live in a large town like Planet Houston/Phoenix/LA..it probably doesn't matter, but once you get 25-30 miles out of town, the little guys start losing all but the strongest signal.
Out here in the boonies...I have a dozen FM stations up with the OE, but only 4 with the stubby one.
When I hit the road...the OE goes back on.