i got one that was similar from frys electronics and it worked like crap. it might have been due to the placement of the end, but i got better reception out of my stock antenna.
but the one that you got might be better quality and work. the only option that i did not try was to put this hidden antenna where the stock antenna is in my roof at the back of the car.
for me to get better reception i might try taking off my stubbie antenna and putting back on my bid rc car antenna. but that thing was put on there with locktight, so i have not had much luck.